WJ-9205 Control Moni.. - of Peter Gottlieb

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INSTRUCTION MANUAL
FOR THE
WJ-9205 SIGNAL MONITOR
-
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INSTRUCTION MANUAL
FOR THE
WJ-9205 SIGNAL MONITOR
WATKINS-JOHNSON COMPANY
700 QillNCE ORCHARD ROAD
GAITHERSBURG, MARYLAND 20878
October 1989

WARNING
This equipment utilizes voltages which are
potentially dangerous and may be fatal if contacted.
Exercise extreme caution when working
with the equipment with any protective cover
removed.
PROPRIETARY STATRMRNT
This document and sUbject matter disclosed
herein are proprietary items to which Watkins­
Johnson Company retains the exclusive right of
dissemination, reproduction, manufacture and
sale.
This document is provided to the individual or
using organization for their use alone in the
direct support of the associated equipment
unless permission for further disclosure is
expressly granted in writing.

WJ-9205 INSTRUCTION MANUAL
REVISION A CHANGE 1
WJ-9205 SIGNAL MONITOR
REVISION A CHANGE 1
TITLE:
MANUAL DATE:
CHANGE 1
DATE:
APPLICABILITY:
CHANGES/ERRATA
INFORMATION:
CHANGE 1
SUMMARY:
INSTRUCTION MANUAL FOR THE WJ-9205 SIGNAL MONITOR
October 1989
February 1990
All units.
Changes refer to updates of the manual to cover design modifications.
Errata refer to corrections or clarifications of information
in the manual.
This change provides additional information for the Remote
Mnemonics Table.
ERRATA:
page 2-15
Add the following remote mnemonic after STS?
ASCII HEX DEC Description
STV(a) C5 197 Stores selected trace to
memory
A-C1-1

WJ-9205 INSTRUCTION MANUAL REVISION A CHANGE 2
WJ-9205 SIGNAL MONITOR
REVISION A CHANGE 2
TITLE:
INSTRUCTION MANUAL FOR THE WJ-9205 SIGNAL MONITOR
MANUAL DATE: October 1989
CHANGE 1
DATE: May 1990
APPLICABILITY:
All units.
CHANGES/ERRATA
INFORMATION: Changes refer to updates of the manual to cover design modifications.
Errata refer to corrections or clarifications of information
in the manual.
CHANGE 2
SUMMARY:
This change corrects information in the Remote Mnemonics Table.
ERRATA:
page 2-2
Replace Figure 2-1 with the following:
J2 J3 J4
A1A7
~ 0 0

REVISION A CHANGE 2
WJ-9205 INSTRUCTION MANUAL
page 2-14
Change the description of INP(a) to the following:
Requests the hardware error.
Selects the input source.
1-3= receiver inputs
4 = memory·
5 = X-y
o = no input selected (off)
. page 2-15
Change the description of SP? to the following:
Requests the selectedspan width (0-7)
Change the description of STS? to the following:
Requests device status
o = riot used
1 = power up
2 = hardware error
3 =operation or mode change
4 = not used .
5 =command error (ERR23)
6 = SRQ set·by this unit
7 =not used
A-C2-2

WJ-9205 INSTRUCTION MANUAL
REVISION A CHANGE 3
WJ-920S SIGNAL MONITOR
REVISION A CHANGE 3
TITLE:
MANUAL DATE:
CHANGE 3
DATE:
APPLICABILITY:
CHANGES/ERRATA
INFORMATION:
CHANGE 3
SUMMARY:
IN.STRUCTION MANUAL FOR THE WJ-9205 SIGNAL MONITOR
October 1989
May 1990
All units.
Changes refer to updates of the manual to cover design modifications.
Errata refer to corrections or clarifications of information in the
manual.
This change corrects the WJ-9205 specifications and the Log/IF
Detector performance test.
ERRATA:
page 1-3
Change the following specifications:
Attenuator
Vertical Display
Sensitivity
(j to 70 dB nominal, 0 to 60 dB in 10
dB steps
70 dB Logarithmic
-100 dBm input for minimum
discernible signal
page 4-9
Change step 8 to the following:
8. Reset the signal monitor SPAN to 2.M. Set the signal generator
output level to produce a response at the top graduation on the
CRT. The. level should be -27 dBm (±2 dBm). Note the exact
output level reading of the signal monitor. This reading is the
reference level for the remaining graduation marks. Reduce the
signal generator output until the display is at the next lower
graduation mark. This level should be 10 dBm (±2 dBm) lower than
the previous graduation mark. Continue to reduce. the signal
generator output until the display is at the·next lower graduation
mark. For each of the remaining graduation marks, the output
level should continue to decrease in multiples of 10 dBm lower than
the reference level of -27 dBm (±2 dBm). The first graduation
mark is the reference level as noted above; the second graduation
mark is 10 dBm (±2 dBm) lower than the reference level; the third
graduation mark is 20 dBm (±2 dBm) lower than the reference
level; etc.
A-C3-1

WJ-9205
TABLE OF CONTENTS
TABLE OF CONTENTS
SECTION I
GENERAL DESCRIPTION
Paragraph
1.1
1.2
1.3
1.4
Electrical Characteristics
Mechanical Characteristics ................................... 1-1
Equi.pment Supplied •••••••••••••••.•••..••••••••••••••• e.••••
Equipment Required But Not Supplied ••..•..••••••••..•.•••...•..
1-1
1-2
1-2
SECTION II
INSTALLATION AND OPERATION
Paragraph
2.1
2.2
2.2.1
2.2.1.1
2.2.1.2
2.2.1.3
2.2.1.4
2.2.1.5
2.2.1.6
2.2.1.7
2.2.1.8
2.2.1.9
2.2.1.10
2.2.1.11
2.3
2.4
2.4.1
2.4.1.1
2.4.1.2
2.4.1.3
2.4.1.4
2.4.1.5
2.4.1.6
2.4.1.7
2.4.1.8
2.4.1.9
2.4.1.10
2.4.1.11
2.4.1.12
Unpacking and Inspection ••.•••••.•••.••..•..•.•.•...•........
Installation •••••••.••'•.••••••.•...•....••••••.••..••......
Connector Signals ••••••..••.••.••.•..•..••••••••...••......
Power Input (FL1J1) ••••.•••••••••.•.••••••••••••••••••...•.
Line Fuse (FI) •••••••••••••••••••••••••••••••••••••••• ,•.•••
X- Y Input/Output (J1) •••.•••••••••••••.•.••••••••.•••.......
Receiver #1 Interface Connector (J2) ••••••••.••••••••.•••••.•...
Receiver #2 Interface Connector (J3) •••••.•.••••••••••••••.••.•.
Receiver #3 Interface Connector (J4) •••••••.•••••••••••••••••..•
Remote Control (J5) (Optional) •••••••••••••••••• ! •••••••••••••
Serial Data Port (J6) (Optional) ••••••••••••••••••••••••••••••••
RE[!ceiver· #1 IN (A1A7Jl) •••••••••••••••••.••••.••••••••••••••
Receiver 4# 2 IN (A lA'1J2) .
Receiver #3 IN (AIA7J3) •••••••••••••••••••••••••••••••••••••
Equipment Malfu,nctions •••••••••••••••••••••••••••••••••••••
O,perat ion ..
Controls and Indicators (Standard Local Operation) ••••••••.••.••..•.
Push O,n/Off Power Sw~tch ••••••••••••••••• - ,.••
INTENSITY Control TRACE Control .............................................
IN PUT Selector ..
SPAN Control .
RBW Control ............................................................
ATTENuation Selector •••••••••••••.•••••••••••••••.••"•.•....
PRESET Gontrol ..
STORE Control ..
SlllFT Control .
Voltage Selector Switch (S2) ••••••••••••••••••••••••••••••••••
Display .••••••• ' e: .
2-1
2-1
2-1
2-1
2-1
2-1
2-3
2.,..3
2-3
2'-3
2-3
2-3
2-3
2-3
2-4
2-4
2-6
2-6
2-6
2-6
2-8
2-8
2-9
2-9
2-9
2-9
2-10
2-11
2-12
iii

TABLE OF CONTENTS
WJ-no~
TABLE OF CONTENTS (Continued)
SECTION II
INSTALLATION AND OPERATION (Continued)
Paragraph
2.5 Remote Operation .•...........••..' •••.•,.................... 2-'12
2.5.1 General Description ...." .• ; .•.•.•.•••••..••.••... ~ • . • . . . . .. 2,-13
2.6 Errol's. • . . . . . . . . . . . . . . . . . . . . • . . . . . . • . • .• .. •. . . . . . . . . . . . .. 2-16
2.6.1 LocalOperation. . . . . . • . . . . . • • . . . . . . • • • • . . . . . • . . . . . . . . . . . .. 2-16
2.,6.2 Remote Operation ........•........••.•••....•.....•........ 2-16
2.7 Preparation for Reshipment .•...• ;............................ 2-17
SECTION III
CIRCUIT DESCRIPTION
Paragraph
3.1
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
'3.2.6.1
3.2.6.2
3.2.6.3
3.2.6.4
3.2.7
3.2.8
3.2.9
3.2.10
3.2.10.1
3.2.11
General e. • • • • • • • • • • • • • •• 3-1
Detailed Circuit Description ••••.•••.••••••••••••••••..•...... 3-2
Type 796534-1 Microprocessor (AlAI) •••••••.•..•••.•.•••••..•.. 3-2
Type 796537-1 Input/Output (A1A4) •••• ; ••• • • • . . . • • • • . • • • . . . .•.. 3-5
Type 796535-1 Data Acquisition (A1A2) •.•••••••..••••••.•....••. 3-8
Type 796536-1 Digital Refreshed Display/Timing Control (A1A3) ••• ~ . .•• 3-10
Type 796561:-1 Input Control (A1A7). • • • •• • • • • • • • • • • • • • • •• . •• • ••. 3-12
Type 796562-1 Frequency Converter/Sweep (A1A8). • • • • • •• • • • . . . . • •• 3-14
Type 796540-1 First LO/FirstConverter/Auto Center (A1A8A1) ••..••••• 3-15
Type 7965'41-1 Second LO/Second Converter (A1A8A2) ••••••••.•..... 3-17
Type 796542-1 Second IF/RBW (A1A8A3) ••••••••••••••••••.•••.•• 3-18
Type 796790-1 Second IF/2 kHz RBW (A1A9) (Optional) •••••••..•.•.•. 3-19
Type 796577-1 LOG IF Amplifier/Detector (AIA10) ••••••••• ~ • •• • . • •. 3-20
Type 796538-1 Remote Interface Board (AlAS) (Optional) •• • •• • • . . • • •. 3-21
Type 796539:-1 Keyboard Display (A4) ••••••••••••.•••••••••••••• .3'-21
Type 796782-1 High Voltage Power Supply/Video (A2) ••••• • • • • • • • • • •. 3-23
Type 796545-1 High Voltage Power Supply/
Deflection Amplifier (A2A1) •••••••••••••••••••••••••••••••..• 3-23
Type 796771-1 Low Voltage Power Supply (A3) •••••••••••••••..•... 3-25
iv

WJ-9205
TABLE OF CONTENTS
TABLE OF CONTENTS (Continued)
SECTION IV
MAINTENANCE
Paragraph
4.1
4.2
4.3
4.4
4:5
4.6
4.6.1
4.6.2
4.6.3
4.6.4
4.6.5
4.6.6­
4.6.7
4.6.8
4.6.9
4.6.10
4.7
4.7.1
4.7.2
4.7.3
4.7.4
4.1.4.1
4.7.4.2­
4.7.4.3
4.7.5
General ....................•..•.••.............•••...... 4,..1
Cleaning and Lubrication •.....•••••••••••...•...•..•••••.•... 4-1
Inspection for Damage or Wear .•••••••••••.....•••.•••••••...• 4-1
Test Equipment Required .•.••..••••••••••••.••.•••••••••••.•• 4-1
Troub~eshooting and Fault Isolation Procedures •...••......••.•••••. 4-2
Performance Tests .•••....••..•••••.....•........•.•••...•. 4-3
Low Voltage Power Supply Performance Test .•.•.....••.••••••.••• 4-3
High Voltage Power Supply/Deflection AMP
Performance Test ••.••.•...•.•.•••.........•...•.......•... 4-4
Microprocessor Performance Test ••.•.••..•........•..•....•••. - 4-5
Keyboard' and Display Performance Test ..•..........•...•....•... 4-5
Sweep Width and Centering Performance Test ....•...•.•.•....•.... 4-6
Input/Output Control Performance Test ...•.•••...••••.•.•.••.... 4-7
LOG/IF Detector Performance Test .••••••••••..•••••••.••.•.... 4-8
Input Attenuator Performance Test ...••.•••••..•••••••.•.••.... 4-9
Second IF/2 kHz RBW (AlA9) Performance Test (Optional) ••••.•••••.. 4-10
Remote Interface (AlAS) Performance Test (Optional) ...••••••••.•.. 4-10
Alignment Procedures •.•••-. • • • • • • • • • • • • • • • • • . • • • • • • • • • • • . . •. 4-11
Microprocessor (AlAI) Alignment .•••••••••••••-..•.•.•••••••••• 4-11
DRD/Timing Controller (AlA3) Alignment ...••...........••••.•.. 4-11
High Voltage Power Supply (A2) Alignment •••••...•....•••.••••••. 4-12
Frequency Converter (AlA8) Alignment •..••.••.••..••...•..••.•. 4- i4
Second LO/Second Converter (AlA8A2) Alignment ••..•.••..••••..•. 4-15­
Second IF/RBW (AIA8A3) Alignment •••••••.•••.•.••..••••••..•. 4-15
First LO/First Converter/Auto Centering (AIA8Al) ...••..•••••....• 4-16
LOG IF AMP/Detector (AIA10) Alignment •••.•••••••••••••••••••• - 4-16
SECTION V
REPLACEMENT PARTS LIST
Paragraph
5.1
5.2
5.3
5.4
5.5
5.5.1
5.5.1.1
5.5.1.2
Unit Numbering Method •.•.••••.•••••••••••••.•..•.•••• ~ . . . .. 5-1
Reference Designation Prefix •••••••••••••••••.•'; • • • . • • • . . . • •. -5-1
List of Manufacturers ••••..•••••••••••••••.•••..••••••.•.•.. 5-1
Parts List -. • • • • . • . .. 5-4
Type WJ-9205Slgnal Monitor (Main Chassis) •.•.•..•...•••..••..... 5-6
Type 796533-1 Motherboard Assembly (AI) ••..•••.•...••.•.•••.... 5-7
Type 796534-1 Microprocessor Assembly (AlAI) .•..•.•••••••••..... 5-8
Type 796535-1 Data Acquisition Assembly (AlA2) .•.•.•.•.•.•••••... 5-10
v

TABLE OF CONTENTS
WJ-9205
TABLE OF CONTENTS (Continued)
SECTION V
REPLACEMENT PARTS LIST (Continued)
Paragraph
5.5.1.3
5.5.1.4
5.5.1.5
5.5.1.6
5.5.1.6.1
5.5.1.6.2
5.5.1.7
5.5.1.7.1
5.5.1.7.2
5.5.1.7.3
5.5.1.8
5.5.1.8.1
5.5.1.9
5.5.1.9.1
5.5.2
5.5.2.1
5.5.3
5.5.4
Type 796536-1 DRD/Timing Controller Assembly (A1A3) ..•........... 5-13
Type 796537-1 Input/Output Assembly (A1A4) •••••••••••••..•••.•.• 5-15
Type 796538-1 Remote Interface Assembly (Optional) (A1A5) •••••....•. 5-17
Type 796561-1 Input Control Assembly (A1A7) •••••.•••.•••••••..•. 5-18
Type 796500-1 Input Selector/Step Attenuator Assembly (A1A7A1) •••••.. 5·,-J9
Type 796544-1 Input FUter Assembly (AlA7A2) ••••.•••.••••..•.••.. 5,...21
Type 796562-1 Frequency Converter/Sweep Assembly (AlAS). • • • •• • • ••• 5-22
TYiJe 796540-1 First LO/First Converter/
Auto Centering Assembly (A1A8Al) •••.•••• ".................... 5-23
Type 796541-1 Second LO/Second Converter Assembly (AIA8A2) •..•••.. 5-27
Type 796542-1 Second IF/RBW (10 kHz) Assembly (AIA8A3) •••••..•••• 5-29
Type 796790-1 Second IF/2 kHz RBW Assembly (Optional) (A1A9) ..•••.•• 5-31
Part 381939-1 Second IF/2 kHz RBW P.C. Board ••••••••.•.....•..•• 5-32
Type 796577-1 LOG IF Amplifier/Detector Assembly (AIAIO) •.•••.•.•. 5-33
Type 796506-2 LOG IF/Detector Assembly (AIAIOAl) ••••••.••.•••..• 5-34
Type 796782-1 High Voltage Power Supply/Video (A2) •••••.•.•••••.•• 5-37
Type 796545-1 High Voltage Power Supply/
Deflection Amplifier Assembly (A2A1) •.••••••••••••••.••.••..... 5-38
Type 796771-1 Low Voltage Power Supply Assembly (A3) •••••.••.•..•• 5-41
Type 796539-1 Keyboard DisplaY Assembly (A4) ••••••••••••••••••.• 5-42
LIST OF TABLES
SEC1'ION'I
1-1
WJ-9205 Signal Monitor, Specifications •••••••••••••••• ".......... 1-3
SECTION n
2-1
2-2
2-3
2-4
Table of Connectors ••••••••••••••••••••••••••••••••••••••.. 2-2
Table of Controls and Indicators. • • • • • • • • • • • • • • • • • • • • • • • • • • • • . •• 2-4
Error Messages •••••••••••••••..••..•••••••..•.•••.••....... 2 - 1 1
Remote Mnemonics •••••• .•• • • • • • • • • • •• • • • • • • • • • • • • • • • • • • • . •• 2.:..14
vi

WJ-9205
TABLE OF CONTENTS
TABLE OF CONTENTS (Continued)
LIST OF TABLES (Continued)
SECTION UI
3-1
3-2
Device Address Selection ......................•.....••...•... 3-4
Interrupts .••.•. -...•......•.•..•..•.•.•..•..•• -. • • • • • • . .• .. 3-8
SECTION IV
4-1
4-2
4-3
4-4
4-5
4-6
Test Equipment Required ....•..••.....•........•.......••.... 4-1
WJ-9205 Troubleshooting Table .•.•••.•••••......••..•......... 4-2
Low Voltage Power Supply Voltages •••.........••.....•.•..•.... 4-4
Pushbutton Performance Verification ...•.•.................•.... 4-5
SPAN and Sweep Width •.....••.••.•.•.•.............•.•..... 4-7
WJ-9205 Signal Monitor Alignment Settings •...........•..•••...•. 4-11
LIST OF ILLUSTRATIONS
SECTION I
Figure
.1-1.
1-2
WJ-9205 Signal Monitor • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1-0
Outline Drawing of the WJ-9205 Signal Monitor • 0 • 0 000 0 000 0 0 0 0 0 0 0 0 o. 1-4
SECTION II
Figure
2-1
2-2
2-3
2-4
2-5
WJ-9205 Signal Monitor, Rear Panel Connectors 0 •• 0 • 0 0 •••• 0 0 0 0 • 0 • 0 0 2-2
WJ-9205 Signal Monitor, Front Panel Controls and Indicators.. 0 0 0 • 0 •• 0 0 0 2-5
CRT Displays for Different Traces 0 0 • 0 0 0 0 0 0 0 • 0 0 • 0 0 •• 0 0 0 ; 0 0 0 •• 0 0 0 2-7
Test Pattern CRT Display 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 • 0 0 0 0 0 0 • o. 2-1"0
Configuration of IEEE-488 Data Bus 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0 00 0 ~ 0 ~ 0 0 0 •• 0 2-12
vii

TABLE OF CONTENTS
WJ-9205
TABLE OF CONTENTS (Continued)
LIST OF ILLUSTRATIONS (Continued)
SECTION III
Figure
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
WJ-9205 Signal Flow Block Diagram ••••••••••.••.•...••.•.•.....
Microprocessor Block Diagram .•••.••••.••.••.•...•..•...•.....
Input/Output Block Diagram •.••••••••••••••••••••••••..••....
Data Acquisition Block Diagram ••••••••••• ; ..•••••••••••.......
DRD/Timing Control Block Diagram •••••••.•••..••.••••••••.•...
Input Control Block Diagram ••••••••••••••••.•••••••••••••....
Input Select/Step Attenuator Block Diagram •.•••.••••••••••••..•..
Input Filter Block Diagram ••••••••••••••••••••••••••••••••••.
Frequency Converter/Sweep Assembly Block Diagram .•••....•.•••...
First LO/First Converter/Auto Centering Block Diagram •.•.•••••.••..
Second LO Converter Block Diagram •••••••••••••.•..•.•.•••••.•
Second IF/RBW Block Diagram •••••••••••••..••••••••...•••••••
Optional Second IF/2 kHz RBW Block Diagram •••••••••••.•..•••...
LOG IF Detector Block Diagram ••••••••••••••••••••••.........
Remote Interface Block Diagram ••••••••••••••••••••••.•..•••••
High Voltage Power Supply Block Diagram ••••••••.•.••••..•.•••.•
Low Voltage Power Supply Block Diagram •••••••••.••••••••••••...
3-2
3-3
3-6
3-8
3-10
3-12
3-13
3-14
2-15
3-16
3..,18
3-18
3-19
3-20
3-22
3-24
3-26
Figure
SECTION IV
4-1
4-2
4-3
4-4
4-5
4-6
4-7
Power Supply PerformanceTest, Equipment Connections ••••••••••••.• 4-4
Input/Output Performance Test, Equipment Connections •••••••••••• ~. 4-7
LOG/IF Detector Performance Test, Equipment Connections ••••••••••• 4-8
DRD/Timing Control Alignment, Equipment Connections •••••••••••••. 4"':12
Typical Test Waveform ••••••••••••••••••• ••. • • • • • • • • • • •.• • . • •• 4-13
X-Y Alignment, Equipment Connections •••••••••••••••••••••••.•• 4-14
Converter/LOG Detector Allgnment, Equipment Connections ••••••••••• 4-15
SECTION V
Figure
5-1
5-2
5-3
WJ-9205 Signal Monitor, Front View ••••••••••••••••••••••••••••• 5-0
WJ-9205 Signal Monitor, Rear View •••••••••.• ;................. 5-0
WJ-9205 Signal Monitor, Top View ••••••••••••••••••••••••••••. .5-5
viii

WJ-9205
TABLE OF CONTENTS
TABLE OF CONTENTS (Continued)
LIST OF ILLUSTRATIONS (Continued)
SECTION VI
SCHEMATICS
Figure
6-1 Type 796533-1, Motherboard Assembly (AI) ..
Schematic Diagram 580534 (Sheet 1 of 2) 0 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 •• 0 •• 6-}
6-1 Type 796533-1, Motherboard Assembly (AI)
Schematic Diagram 580534 (Sheet 2 of 2) 0 0 0 0 0 0 0 0 0 0 0 0 0 • • • • • • • • • ••• 6-3.
6-2 Type 796534-1, Microprocessor Assembly (AlAI)
Schematic Diagram 580474 •• 0 • 0 0 0 0 0 0 0 • 0 0 0 •• 0 0 • 0 0 ••••••••• 0 0 •• 6-5
6-3 Type 796535-1, Data Acquisition Assembly (AIA2)
Schematic Diagram 580508 0 •• 0 • 0 0 0 .0 0 • 0 ••• 0 •••• 0 0 • • • • • • • • • • •• 6-7
6-4 Type 796536-1, DRD/Timing Controllel' Assembly (A1A3)
Schematic Diagram 580521 0 0 0 0 .0 0 0 0 0 0 • 0 0 • 0 • 0 ••• 0 0 ••••••••••• 0 6-9
6-5 Type 796537-1, Input/Output Assembly (A1A4)
Schematic Diagram 580551 0000000.00.0.000000 •••• 0 ••••••••••• 6-11
6..:6 ' Type 796538-1, Remote Interface Board (A1A5) (Optional)
Schematic Diagram 580560 0 0 0 0 0 0 0 0 0 0 000 • 0 0 ••• 0 0 .00 • 0 0 • 0 • • • • •• 6-13
6-7 Type 796561-1, Input Control Assembly (A1A7)
Schematic Diagram 381158 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ••• 0 0 •• 0 ••• 0 6-15
6-8 Type 796500-1, Input Selector/Step Attenuator Assembly (A1A7AI)
Schematic Diagram 480755 o. 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 • 0 .00 •• 0 • ~ • 0 • • •• 6-17
6-9 Type 796544-1, Input Filter Assembly (AlA7A2)
Schematic Diagram 381196 0000 •• 0 ••• 0. 0 0 o' 0000 ••• 00 •••••••• 00. 6-19
6-10 Type 796562-1, Frequency Converter/Sweep Assembly (AlA8)
Schematic Diagram 480970 0 0 • 0 0 • 0 0 0 0 • 0 0 0 0 0 0 0 • 0 • 0 0 0 •••• 0 •• 0 • •• 6-21
6-11 Type 796540-1, First LO/First Converter/Auto Centering Assembly
(A 1A8A1), Schematic Diagram 580511 0 0 • 0 0 0 0 0 0 0 0 00 0 0 0 0 0 • 0 •••••• 0 6-23
6-12 Type 796541-1, Second LO/Second Converter Assembly (A1A8A2)
Schematic Diagram 380992 • 0 0 0 0 0 • 0 0 0 0 0 0 0 0 • 0 0 ••• 0 0 • 0 0 • 0 • 0 • • • •• 6-25
6-13 Type 796542-1, Second IF/RBW (10 kHz) Assembly (A1A8A3)
Schematic Diagram 480881 ••••• 0 0 0 0 0 • 0 0 0 0 0 • 0 ••• 0 0 0 • 0 0 0 •••••• 0 6-27
6-14 Type 796790-1, Second IF/2 kHz RBW Assembly (A1A9) (Optional)
Schematic Diagram 481466 o. 0 0 0 0 0 0 0 0 0 0 •• 0 • 0 0 •• 0 • 0 0 • 0 0 0 0.0 0 • 0 • 0 6-29
6-15 Type 796577-1, LOG IF Amplifier/Detector Assembly (A1A10)
Schematic Diagram 381088 0 0 0 0 0 • 0 0 0 • 0 0 0 0 0 0 0 0 •• 0 0 0 0 0 0 0 0 0 0 0 • • •• 6-31
6-16 Type 796506-2, LOG IF/Detector Assembly (A1A10A1)
Schematic Diagram 580454 0 0 0 0 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 0 • 0 0 0 ••• 0 6-33
6-17 Type 796782-1, High Voltage Power Supply/Video (A2)
Schematic Diagram 381891 0 0 0 0 0 • 0 0 0 0 0 • 0 0 0 0 0 0 0 0 0 •• 0 0 o •• 0 0 • • • •• 6-35
6-18 Type 796545-1, High Voltage Power Supply/Deflection
Amplifier Assembly (A2A1), Schematic Diagram 580528 0 0 0 0 • 0 0 0 0 0 • • •• 6-37
ix

TABLE Of CONTENTS
WJ-9205
TABLE OF CONTENTS (Continued)
LIST OF ILLUSTRATIONS (Continued)
SECTION VI
SCHEMATICS (Continued)
Figure
6-19 Type 796771-1, Low Voltage Power Supply Assembly (A3)
Schematic Diagram 381840 ••••••••••••••••••••.••.••••.•.•... 6-39
6-20 Type 796539-1, Keyboard Display Assembly (A4)
Schematic Diagram 580502 •.••••••••••••••••••••••••..•.•••.• 6-41
6-21 Type WJ-9205 Signal Monitor, Main Chassis
Schematic Diagram 480791 ••••••••••••••••••••••••••••.•••••• 6-43
x

SECTION I
GENERAL DESCRIPTION

GENERAL DESCRIPTION
WJ-9205
SIGNAL MONITOR
WJ-9205 • ~ Xl
•
Figure 1-1. WJ-9205 Signal Monitor
1-0

WJ-9205
GENERALDESGRIPTION
SECTION I
GENERAL DESCRIPTION
1.1
ELECTRICAL CHARACTERISTICS
The WJ-9205Signal Monitor is designed as a companion unit for the WJ-8615D
VHF/UHF Receiver, but may also be used with other receivers having a 21.4 MHz IF output. It
utilizes the latest state"';of-the-art technology to provide a wide range of monitoring and signal
analysis capabilities~ The monitor contains its own low- and high-voltage regulated power
supplies, and operates from 115 or 230 Vac through its fused input. When operating the WJ-9205
Signal Monitor with WJ-86151l receivers, whose operating frequencies have been extended beyond
500 MHz, an additional input to the signal monitor for each extended receiver must be connected.
This interface cable consists of two 15-socket D-type connectors that link pins ~. and 6 of the
receiver's AUX connector (Jll) to pins 2 and 6 of the signal monitor's RECEIVER #1; RECEIVER
#2, or RECEIVER #3 connectors (J2, J3, or J4, respectively). This cable provides a TTL LOW
signal when the receiver is operating within its normal frequency range or a TTL HIGH when it is
operating within its extended frequency range. This indicates when the signal monitor must
compensate with spectrum inversion associated with the frequency extension process•.
The signal monitor has microprocessor based control circuitry to provide nonflickering
digitally refreshed displays of one, two or three traces, while monitoring the sweep and
signal circuitry to provide virtually adjustment-free operation. Common adjustments such as
sweep rate and centering are performed automatically to display an optimum trace.
The WJ-9205 Signal Monitor accepts inputs from up to three receivers and displays
spectrum traces for up to three inputs simultaneously, within 2.5 MHz above and below the
receiver tuned frequency, on its 4.0 inch (diagonal) CRT. An accurate logarithmic range of 70 dB
is provided for signal display. From the front panel controls or by the IEEE-488 remote
interface, the signal monitor may be programmed to display one, two or three traces, with
independently selected display parameters for each trace channel. Each trace is individually
programmed for frequency span, display resolution, signal attenuation and signal source. Any of
the input sources can be assigned to any of the traces and the frequency span may be set for
spans ranging from 50 kHz to 5 MHz in a 1-2-5 calibrated sequence and 0 Hz. The standard
resolution bandwidth of the display is 10 kHz, with a second selectable resolution bandwidth
available as an option.
Where detailed signal analysis is required, multiple traces, each programmed with
different display parameters, may be assigned to the same. inplit source. With a broad frequency
span assigned to one trace, a wideband overview of the entire input spectrum (up to 5 MHz) may
be viewed. The remaining traces may then be set for narrower frequency spans to provide more
detailed narrowband traces.
One 9-pin D-type connector is provided' on the rear panel of the signal monitor
which permits a large screen X - Y display monitor to be used with the WJ-9205.
1.2 MECHANICAL CHARACTERISTICS
The WJ-9205 Signal Monitor is housed in a 3.5 inch high by 8.25 inch wide package
which extends 20 inches into a standard 19-inch equipment rack. It may be mounted together
1-1

GENERAL DESCRIPTION
WJ-9205
with a WJ-8615D Receiver, a second signal monitor, or a half-rack blank panel. The combined
package mounts into a standard 19-inch equipment cabinet using the supplied mounting kit.
The main chassis top, bottom, front, rear and internal compartment panels are
constructed of aluminum. With the exception of the ac input voltage selector switch (S2), all
switches, controls and indicators are on the front panel of the unit.
1.3 EQUIPMENT SUPPLIED
The equipment supplied consists of the WJ-9205 Signal Monitor, detachable line
cord, three 15-pin connectors, one 9-pin connector, and' a 3/4 amp or 3/8 amp slo-blow fuse.
Additional equipment supplied includes an alignment tool, five extender boards and an eJct:ender
cable to permit troubleshooting and/or maintenance procedures.
1.4 EQUIPMENT REQUIRED BUT NOT SUPPLIED
To obtain full use of the signal monitor, one or more WJ-:-8615D receivers should be
utilized. However, the signal monitor may be Used with other manufacturer's receivers, providing
a pre-filtered 21.4 MHz IF signal is available. One coaxial cable with BNCconnectors is needed
for each WJ-8615D Receiver connected to the signal monitor. Up to three (3) separate receivers
can be monitored. Specifications are given in Table 1-1.
1-2

WJ-9205
GENERAL DESCRIPTION
Table 1-1. WJ-9205 Signal Monitor, Specifications
Cathode Ray Tube (CRT)
Sweep Span ...•••.••..•••..••••
Sweep Rate ••.•..••••..•••.•.••
Sweep Linearity •.•...•••.•.••••.
4-inch Diagonal Screen, P-31 Phosphor
Standard (Short Persistence)
o Hz and 50 kHz to 5 MHz (1-2-5 sequence)
Automatic, 25 ms - 200 ms
10%
Resolution Bandwidth
Input:
•••••••.•••••
10 kHz, approximately (second optional
front panel selectable resolution
Bandwidths available)
Input Impedance •••••••••••••
Input Frequency •.•••.•••••••
Input VSWR ••••••••.•••••.•
Input Level Maximum ••••••••.
Attenuator - .
Vertical Display •..••••.••.••••••
Centering Control ••••••••••••••.
Sensitivity •...•••.••••.••••••••
Third Order Intercept ••.•••••••••.
LO .Radiation •••.•••.•••••••••••
Input Supply Voltage
Power Consumption
50 Ohms Nominal
21.4 MHz,± 2.5 MHz
1.5:1 or less
+20 dBm without damage
o- 70 dB in 10 dB calibrated steps
Logarithmic, 70 dB calibrated
Automatic
100 dBm input for minimum discernible
signal
+15 dBm typical
-80 dBm maximum
115/230 Vac, ± 10%, 48:-420 Hz
Approximately 40 watts
Temperature Range:
Operating •••••...•..••••••
Nonoperating •.•••••••.•.•••
O°C to 50°C
-20°C to 80°C
Dimensions:
Width
Height
Depth
Weight
8.25 inches (20.9 cm)
3.5 inches (8.9 cm)
20 inches (50.8 cm)
18 lbs. (8.2 Kg), approximately
1-3

GENERAL' DESCRIPTION
-
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i

SECTION II
INSTALLATION AND OPERATION

INSTALLATION AND OPERATION
WJ-9205
SECTION II
INSTALLATION AND OPERATION
2.1 UNPACKING AND INSPECTION
Examine the shipping carton for damage before unpacking the equipment. If the
carton exterior appears to be damaged, attempt to have the carrier's agent present during the
unpacking of the equipment. If this is not possible, and if equipment damage is evident, retain all
packing material and shipping containers for· the carrier's inspection. Also, verify that the
equipment supplied is as listed on the packing slip. Contact the Watkins-Johnson Company,
Communication Electronics Technology Division, Gaithersburg, Maryland or your Watkins­
Johnson representative with details of any discrepancy or shortage.
2.2 INSTALLATION
The WJ-9205 Signal Monitor is designed to mount in one half of a standard
equipment rack. The unit occupies 3.5 inches of vertical rack space and extends 20 inches into
the rack. Do not depend solely on the front panel mountings to support the unit. Use an
approved type of slide, such as Johnathori Type QD110, or other hardware to support the monitor
in the equipment rack.
Access to the rear panel is recommended so that input and output connections can
be changed conveniently, if desired. The rear panel connections are described in Table 2-1. As a
reference for the rear panel connectors, see' Pigure 2-1.
NOTE
Before applying power to the unit, verify that
the selected line voltage for the system matches
the utiliz~d line voltage.
2.2.1 CONNECTOR SIGNALS
2.2.1.1 Power Input (PLIJI) - The power input connector provides the ac power input to
the signal monitor. It will support line voltages of 115 Vac or 230 Vac as determined by the
setting of the line voltage selector switch (52). In either pOsition, the power line frequency may
range from 48 - 420 Hz.
2.2.1.2 Line Puse (PU - The line fuse and fuse housing provide a 3/4 amp slo-blow fuse for
115 Vac or a 3/8 amp slo-blow fuse for 230 Vac power input. .
2.2.1.3 X-Y Input/Output (JI) - This 9-socket D-type connector provides for the X and Y
axis of the signal monitor display to be connected to an external monitor. It also permits using
the WJ-9205 as an X-Y Monitor with an external X-Y Input Source, such as a WJ-9206 Signal
Monitor or a WJ-8611B Receiver with the signal monitoroption (Option A) installed.
2-1

WJ-9205
INSTALLATION AND OPERATION
Table 2-1. Table of Connectors
Connector Type Function
FLIJI Power Input 3 Prong Power Input 115/230 Vac ±1096, 48 - 420 Hz
Fl Fuse Slo-Blow Houses 3/4 amp for 115 Yac or 3/8 amp for
230 Vac
Jl X-YIN/OUT 9 Pin 0 Connects X and Y axis of the Signal Monitor
display to an external monitor. .
·J2 Interface RCVR #1 15 Pin 0 Interface Connector for Receiver #1
J3 Interface RCVR #2 15 Pin 0 Interface Connector for Receiver #2
J4 InterfaceRCVR #3 15 Pin 0 Interface Connector for Receiver #3
J5 Remote Control IEEE-488 Remote Control Port (Optional)
J6 Serial Data Port RS-232 or RS-422 Future expandability. (Not presently used.)
AIA7Jl IF IN RCVR #1 BNC Provides 50 ohm input to a 21.4 MHz IF
signal from Receiver #1
AIA7J2 IF IN RCVR #2 BNC Provides 50 ohm input to a 21.4 MHz IF
signal from Receiver '2
AIA7J3 IF IN RCVR #3 BNC Provides 50 ohm input to a 21.4 MHz IF
signal from Receiver #3
A1A7
J2 J3 J4
®
J1
0
~ ~
3/4 A S8 115 VAC
318 A 58230 VAC
® • 0 Fl 52
A1A7 0
@
J2
0
•• 0
(J6) .
0
~230V
0 Cl l15V
0
®
AlA7
0
• 0
J3 ••• • • • •
FUJ1
Jl
@
(j)
...
(§. GNO
~ I~
0 I I I I
Figure 2-1. WJ-9205 Signal Monitor, aew Panel ConnectorS
2-2

INSTALLATION AND OPERATION
WJ-9205
2.2.1.4 Receiver 11 Interface Connector (J2) - This 15-pin D-type connector is used to
connect Receiver #1 to the Signal Monitor when Receiver #1 is a WJ-8615D Receiver whose
frequency range has been extended to 500 MHz. Figure 2-1 depicts the pin configuration. As
shown, pin 1 is the bottom pin of the left column and pin 9 is the bottom pin of the right column.
Pin 6 accepts a HIGH or LOW TTL signal. Pin 2 is ground. See paragraph 1.4.
2.2.1.5 Receiver 12 Interface Connector (J3) - This IS-pin D-type connector is used to
connect Receiver #2 to the Signal Monitor when Receiver #2 is a WJ-8615D Receiver whose
frequency range has been extended to 500 MHz. Figure 2-1 depicts the pin configuration. As
shown, pin 1 is the bottom pin of the left column and pin 9 is the bottom pin of the right column.
Pin 6 accepts a HIGH or LOW TTL signal. Pin 2 is ground. See paragraph 1.4.
2.2.1.6 Receiver '3 Interface Connector (J4) - This 15-pin D-type connector is used to
connect Receiver #3 to the Signal Monitor when Receiver #3 is a WJ-8615D Receiver whose
frequency range has been extended to 500 MHz. Figure 2-1 depicts the pin configuration. As
shown, pin 1 is the bottom pin of the left column and pin 9 is the bottom pin of the right column.
Pin 6 accepts a HIGH or LOW TTL signal. Pin 2 is ground. See paragraph 1.4.
2.2.1.7 Remote Control (J5) (Optional) - This IEEE-488 type multipin connector provides
the control interfacing between the WJ-9205 Signal Monitor and a suitable external computer or
other remote controlling device using a standard IEEE-488-1978 remote interface. The
installation of the interface cables at this connector must comply with the specifications set
forth by the IEEE-488-1978 Standard, as deviation from this standard could result in unreliable
bus operation.· The interface connection may be installed in a STAR or DAISY CHAIN
configuration.
2.2.1.8 Serial Data Port (J6) (Optional) - The RS-232 or RS-422 Port slot is available on
the rear panel to provide for future expandability of the WJ-9205 Signal Monitor. This port is not
presently supported by the standard Signal Monitor and requires additional software to be
installed for it to be utilized~ This option may be included at the time of purchase or the
connector and required software can be installed later.
2.2.1.9 Receiver 11 IN (A1A1Jl) - This BNC type connector provides a 50 ohm input
impedance to a 21.4 MHz IF signal from Receiver #1, and is selected by pressing the INPUT up
arrow or down arrow key on the front panel to display RXI in the window.
2.2.1.10 Receiver '2 IN (A1A1J2) - This BNC type connector provides a 50 ohm input
impedance to a 21.4 MHz IF signal from Receiver #2, and is selected by pressing the front panel
INPUT up arrow or down arrow key to display RX2 in the window. .
2.2.1.11 Receiver 13 IN (A1A1J3) - This BNe type connector provides a 50 ohm input
impedance to a 21.4 MHz IF signal from Receiver #3, and is selected by pressing the INPUT up
arrow or down arrow key on the front panel to display RX3 in the window.
2-3

WJ-9205
INSTALLATION AND OPERATION
2.3 EQUIPMENT MALFUNCTIONS
The WJ-9205 Signal Monitor was thoroughly inspected, tested, and factory adjusted
for optimum performance prior to shipment. If any malfunctions are encountered after following
the recommended installation procedures, paragraph 2.2, verify that the inter-unit cables are
installed properly and that the correct input signals are present at the proper jacks. Maintenance
and troubleshooting of the unit can be aided utilizing the procedures outlined in Section IV of this
manual. Contact your Watkins-:Johnson representative or the Watkins-Johnson Company,
Communication Electronics Technology Division, Gaithersburg, Maryland prior to undertaking any
corrective maintenance action, to prevent the possibility of voiding the warranty.
2.4 OPERATION
The WJ-9205 Signal Monitor provides a visual indication of spectrum for the
21.4 MHz IF signals from one, two or three separate receivers simultaneously on its 4.0 inch
(diagonal) CRT. Operation is controllable from the front panel controls or via its IEEE-488
remote interface and a suitable controller. The various switches, controls and indicators used on
the monitor during local operatiOn are discussed in the following paragraphs. Table 2-2 lists the
controls and indicators. With the exception of the ac input voltage selector switch, all controls
and indicators are on the front panel of the unit. See Figure 2-2 as a reference for the location
of the front panel controls and indicators.
Table 2-2. Table of Controls and Indicators
Control/Indicator
Description
Controls
POWE,R ••••••••••••••••••••••••.•
INTE-NSITY ..•••.•...
TRACE .........••...•.•.••.•.••
INPUT
SPAN
RBW
ATTEN
PRESET
STORE
SHIFT.
................~.....'....
Voltage Selector (S2)
Applies power to the Signal Monitor.
Adjust CRT Trace Brightness.
Selects Trace number 1, 2 or 3.
Selects input source: Receiver #1, Receiver #2,
Receiver #3, Memory, X-Y or turns the trace
off.
Selects the Frequency Span. (0 to 5 MHz in
1-:2-5 sequence.)
Selects 10 kHz Resolution Bandwidth or second
other optional resolution Bandwidth.
Selects the amount of attenuation.
,Recalls previously stored parameters.
Stores in memory the present displayed
parameters and the associated image.
Redefines the keypad for special functions. See
~h2.4.1.10.
Located on the rear panel, selects either 115
Vac or 230 Vac Input.
2-4

INSTALLATION AND OPERATION
WJ-9205
Table 2-2. Table of Controls and Indicators (Continued)
Control/Indicator
Description
Indicators
Digital Display •...•••••••••••••••• These LEDs display the selected parameters:
Trace, Input, Span, RBW and Attenuation. In
addition, they indicate failure conditions•
. SHIFT •••••••••••••••••••••••••• This LED indicates that the SHIFT key has been
pressed to enable shifted functions, refer to
paragraph 2.4.1.10 for a description of these
functions.
REM ••••..•••..•••••••••••••••• This LED indicates when unit is in remote
control. Remote control is selected by pressing
the SHIFT key and then pressing the STORE
key. Refer to paragraph 2.4.1.10.
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8 C
INTENSITY ® ®
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POWER
Figure 2-2. WJ-9205 Signal Monitor, Front Panel Controls and Indicators
2-5

WJ-9205
INSTALLATION AND OPERATION
2.4.1
CONTROLS AND INDICATORS (STANDARD LOCAL OPERATION)
The keyboard consists of ten buttons labeled 0 to 9, as shown in Figure 2-2. Buttons
o to 4 have up arrows imprinted on them, while buttons 5 t09 have down arrows. Each button
pair (0-5, 1-6, 2-7, 3-8, 4~9) causes the value in the display directly above the buttons to cycle
either up or down the number of times the button is pressed. The top buttons (0 to 4) cause the
number to get larger or the display to cycle up. The bottom buttons (5 to 9) cause the number to
get smaller or the display to cycle down.
When the button being pressed causes the data being displayed to reach its limit
(either up or down), pressing the button any further does not" effect the display, but causes an
audible tone.
2.4.1.1 Push On/Off POWER Switch - This pushbutton switch applies power to the unit.
Pressing the button a second time removes the power from the unit.
During the power up sequence, pressing the A or B pushbutton allows the unit to
respectively perform the IEEE-488 address check (if installed), or set the default parameters
listed in paragraph 2.4.1.8. These functions can be selected by pressing the pushbutton for the
desired operation during the power up sequence.
A - Pressing this pushbutton during the signal monitor power up
sequence enables the IEEE-488 address to be viewed or changed. When
enabled, the IEEE-488 address is visible on the signal monitor front
panel display as: 488 ADR XX .DCML (XX=OO to 31). With this
displayed on the front panel, pressing any two numbers changes the 488
address to the value of the new number. Pressing a third digit allows
the new 488 address to be changed again. Pressing the A (PRESET)
pushbutton enters the displayed 488 address as the signal monitor
IEEE~488 address. If an invalid 488 address is selected, pressing the A
key sets the 488 address to 01.
B - Pressing this key in during the power up sequence sets the signal
monitor operating parameters to the default parameters. This allows
signal monitor parameters to be set to known conditions. Refer to
p~agraph 2.4.1.8 for a listing of the default parameters. This can be
useful in the event the signal monitor operation latches up.
Pressing the power ON/OFF button a second time removes the power from the unit
and the button returns to the fully extended OFF position.
2.4.1.2 INTENSITY Control - This control is used to adjust the intensity or brightness of
the trace(s} on the front of the CRT. The INTENSITY may be adjusted to suit the operator.
2.4.1.3 TRACE Control - The TRACE control pushbuttons allow selection of 1, 2 or 3
Trace(s} to be displayed on the CRT. The vertical space on the CRT is divided evenly by the
number of traces selected to be displayed. A single trace occupies the full screen and is
calibrated with a gradicule. Selection of two or three traces respectively occupies 1/2 and 1/3
screen displays on the CRT. Refer to Figure 2~3 for the CRT display for the different number of
traces.
2-6

INSTALLATION AND OPERATION
WJ-9205
One Trace
Two Traces
Three Traces
Figure 2-3. CRT Displays forDifferent Traces
2-7

WJ-9205
INSTALLATION AND OPERATION
Pressing the TRACE up arrow or down arrow keys enters the value 1, 2 or 3 in the
display window. During keyboard control, the number displayed in the trace position is the trace
to which the keyboard operation applies. For each trace selected, signal source (INPUT),
frequency span (SPAN), display resolution (RBW) and signal attenuation (ATTEN) are individually
programmed.
When any of the traces are assigned to the X-Y signal sourcing input
(paragraph 2.4.1.4), then the entire CRT is devoted to the X-Y signal input.
2.4.1.4 INPUT Selector - The INPUT selector pushbuttons are used to select the receiver
IF signal(s) source for the trace indicated in the display window,from up to three (3) receivers.
Each trace may be individually programmed for INPUT. By pressing the INPUT up arrow or down
arrow keys, the INPUT display window indicates the signal source for the trace displayed on the
CRT. The selections of INPUT available and a brief description of each follow:
RX1 -
RX2 -
RX3 -
IF Signal from Receiver #1 is selected.
IF Signal from Receiver #2 is selected.
IF Signal from Receiver #3 is selected.
M-Z - Stored Frame of Data in memory is selected. When in M-Z
mode for INPUT, the display will present the parameters under which
the data was captured, INPUT, SPAN, RBW, and ATTEN. The trace
display window will indicate which trace is displaying the M-Z data.
X-Y - CRT deflection is sourced to the X-Y Signal Inputs. When the
X-Y mode is selected, the display will ignore the arrangement of
display fields, and shall read "X-Y SCOPE". All internal functions of
the signal monitor stop except for error checking. The TRACE, SPAN,
RBW and ATTEN keys have no effect. To exit 'X-Y SCOPE' mode,
either of the INPUT keys must be pressed. Pressing the PRESET key
will cause the normal preset function and exit the X-Y mode. The .unit
can be put in remote control by the IEEE-488 bus even if 'X-Y SCOPE'·
has been selected•
. OFF - Trace not displayed.
2.4.1.5 SPAN Control - The SPAN control pushbuttons are used to select the· frequency
span of the trace shown in the display window. Each trace may be individually programmed for
frequency span. By pressing the SPAN up arrow or down arrow key, the width of the trace is
incremented or decremented from 0 kHz to 5 MHz. The LED display window, above the keys,
shows the selected frequericy span. The choices are: 000, 50 kHz, .1 MHz, .2 MHz, .5 MHz, 1.
MHz, 2. MHz and 5. MHz. Choosing a span of 000 provides a center tuned frequency of 21.4
MHz. A span of 000 can be used to observe modulation on a received signal.
2-8

INSTALLATION AND OPERATION
WJ-'9205
2.4.1.6 ROW Control - The RBW control pushbuttons are used to select the Resolution
Bandwidth of the trace shown in the display· window. Each trace may be programmed
individually, when the optional second ResolUtion Bandwidth has been installed, by pressing the up
arrow or down arrow button to the desired selection. Without this option installed, the standard
unit utilizes 10 kHz as the only selection. Pressing the increment or decrement buttons will
result in an audible tone and the display will warn "OPTION NOT INST".
2.4.1.7 ATTENuation Selector - The Attenuation selector pushbuttons provide attenuation
of incoming signals in 10 dB steps. Each trace may be individually programmed for the level of
attenuation. By pressing the ATTEN up arrow or down arrow key, the attenuation of the signal is
incremented or decremented in 10 dB steps. The LED display window, directly above the keys,
displays the selected level of attenuation. The attenuation: range available is: 0 dB,lO dB, 20
dB; 30 dB, 40 dB, 50 dB, 60 dB and 70 dB. Note that the attenuation is performed to the actual
incoming signal(s), so the trace is also reduced in amplitude by the amount of attenuation
selected.
2.4.1.8 PRESET Control - The PRESET control button causes the signal monitor operating
parameters to be reset to parameters stored in sustained memory. If no preset parameterS have
been entered or if sustained memory is lost, the signal monitor will be set to the following
default parameters:
Single Trace
Input Source
Span
RBW
Attenuation
488 Address
Receiver #1
5 MHz
10 kHz
odB
Determined by switch setting
To store operating parameters in memory, first set the signal monitor to the
desired status. Next, press the SHIFT key and then press the PRESET key. The operating
parameters present at the time the SHIFT and PRESET keys were pressed are now stored in
sustained memory. This allows operating parameters to be changed and then by pressing the
PRESET key to return to a known preset operating status.
2.4.1.9 STORE Control - The STORE control key causes the Signal Monitor to store the
current input frame and parameters selected for the INPUT (RCVR #1, RCVR #2, or RCVR #3)
from any of the three traces. This data is stored in the display memory. Only one frame and its
associated parameters can be stored in memory at anyone time. When a new input is selected
for memory, the memory contents are overwritten so that only the last stored seiection remains
in memory. The stored frame and parameters can be recalled and displayed on any trace by
selecting the M~Z INPUT.
When the INPUT for a trace is switched to M-Z (where Z can be·equal to Z, 1, 2, or
3), the stored input frame and parameters will be displayed. M-Z indicates that the memory has
been cleared and no INPUT or parameters have been stored in memory. M-l indicates the frame
and parameters stored were stored for the RCVR #1 input. M":2 indicates that the stored frame
and parameters were those selected for the RCVR #2 input. M-3 indicates that the frame and
parameters stored were those selected for RCVR #3.
2-9

WJ-9205
INSTALLATION AND OPERATION
2.4.1.10 SHIFT Control - The SHIFT control button is used, along with one other button, to
allow additional functions to be selected. Pressing the SHIFT key illuminates the SHIFT LED on
the signal monitor front panel. When this LED is illuminated, the SHIFT function is enabled.
Pressing a second key enables the selected SHIFT function. After pressing the second key, the
SHIFT LED is extinguished indicating that the SHIFT function has been performed. The following
list describes the various SHIFT functions.
SHIFT/STORE - Pressing the SHIFT key and then pressing the STORE
key allows the operator to toggle between local control and remote
control. When remote control is selected the REM LED illuminates. In
local control, the LED is extinguished. The current control mode is
maintained in battery sustained memory.
SHIFT/PRESET - Pressing the SHIFT pushbutton and then pressing the
PRESET pushbutton causes the current operating parameters of each
trace to be stored in memory. Once stored, the parameters for each
trace can be changed as desired. Then by pressing PRESET, all three
signal monitor traces are set to the parameters stored in memory.
SHIFT/l - Pressing the SHIFT and then the 1 pushbuttons causes the
CRT to temporarily display a known test pattern on the selected trace
display. The test pattern is a series of four ramp waveforms. Refer to
Figure 2-4 for the ramp waveform.
Figure 2-4. Test Pattern CRT Display
2-10

INSTALLATION AND OPERATION
WJ-9205
SIDFT/2 - Pressing the SHIFT and then the 2 keys cause any existing
error messages to be displayed on the front panel display. An error
condition is indicated on the front panel via-the presence of decimal
points in place of blank spaces. The decimal points disappear when the
SHIFT/2 keys are pressed and the error codes are displayed. Refer to
Table 2-3 for the list of error messages. SHIFT!2 has no effect if no
error conditions exist.
Table 2-3. Error Messages
Message
DRD FAILURE
-15 V LOW
-15 V HIGH
DA FAILURE
+5 V LOW
+5 V HIGH
NO LOCK-VCO
+8 V LOW
+8 V HIGH
+15 V LOW
+15 V HIGH
488 SELF TEST
RAM FAILURE
EPROM CKSUM
2K V LOW
-2K V HIGH
OPTION NOT INST
POWER UP
UNKNOWN COM
COM ERROR
INVALID PAR
Cause of Error
DRD not interrupting
. -15 Vdc supply voltage too low
-15 Vdc supply voltage too high
Data acquisition not interrupting
+5 Vdc supply voltage too low
+5 Vdc supply voltage too high
VCO fails to lock
+8 Vdc supply voltage too low
+8 Vdc supply voltage too high
+15 Vdc supply voltage too low
+15 Vdc supply voltage too high
IEEE-488 fails self test
Sustained memory test failure
EPROM fails checksum comparison
-2K Vdc supply voltage too low
-2K Vdc supply voltage too high
An Option must be installed before the requested function
can be performed .
Power has been applied to the unit
Unimplemented 488 command
488 Command error
Invalid 488 Request
NOTE
If an errorfias been sent to the display, the error
message is not repeated unless the power is
cycled off and on again or unless the SHIFT/2
keys are pressed. Decimal points are visible in
the display until the error is cleared.
2.4.1.11 Voltage Selector Switch (S2) - The voltage selector switch, located on the rear
panel, permits selection of either 115 Vac or 230 Vac line voltage input. Set the voltage selector
switch in the voltage position closest to the line voltage· utilized. B6th the 115 V and 230 V
position will support line voltages ranging from ±10% of the stated line voltage. In either
position, the power line frequency may range from 48 to 420 Hz.
2-11

WJ-9205
INSTALLATION AND OPERATION
2.4.1.12 Display -- An alphanumeric 16 character LED display provides visual indication of
working parameter conditions. Refer to Figure 2-2 for a typical alphanumeric display. The
display is viewed through a display window which is located above the keypad on the front panel
and divided into five fields. The display indicates the parameter setting: TR (Trace), INPUT,
SPAN, RBW (Resolution Bandwidth), and ATTEN (Attenuation). The display is also used to
display messages such as the product number, software version (WJ-9205~X.X.X)and to alert the
operator of failure conditions. The position of each part of the display and spacing of the display
is as follows:
-~b-~----b------b-~----b---­
TR INP SPN RBW ATN
2.5 REMOTE OPERATION
The IEEE-488 Remote Interface provides talk and listen capabilities between the
signal monitor and external equipment, such as calculators, minicomputers or other IEEE-488
equipped controlling devices. The data is transferred between units in a bit-parallel, byte-serial
form, utilizing sixteen interconnection lines. These lines consist of eight bi-directional data bus
lines, three data byte transfer lines and five management lines. Data or address information is
transferred between devices, utilizing the data bus lines. Refer to Figure) 2-5 for the pin
configuration of the standard IEEE-488 Data Bus.
0101
0102
0103
0104
EOI
DAV
NRFD
NOAC
IFC
SRQ
ATN
SHIELD
~
I 13
2 14
3 15
4 16
5 17
6 18
7 19
8 20
9 21
10 22
II 23
12 24
~
0105
0106
0107
0108
REN
GND ITW PAIR W!OAVI
GNblTW PAIR W!NRFDI
GNO ITW PAIR W!NOACI
GNOITW PAIR W!IFCI
GND ITW PAIR W!SRQI
GND ITW PAIR W!A.... NI
SIGNAL GROUND
Figure 2-5. Configuration of IEEE-488 Data Bus
2-12

INSTALLATION AND OPERATION
WJ-9205
The data byte transfer lines indicate the availability and validity of the information
on the data bus lines; if the devices are ready to accept data; and if the data has been accepted.
The interface management lines specify whether the data bus lines are carrying data or address
information; request service; clear the interface; and indicate the end of a transfer sequence.
The capabilities of the IEEE-488 Interface include:
Function Description
• Source handshake
• Acceptor handshake
• Basic talker with serial poll
• Basic listener with serial poll
• Service request
• Device clear
IEEE-488-1978 Subsets
(SRI)
(ARI)
(T6)
(L4)
(SRI)
(DCI)
Essentially, this means that the monitor can talk or listen when commanded by the controller. It
can also issue a service request notifying the controller when it needs service.
Two types of data transfer are supported on the WJ-9205 Signal Monitor. One type
of data transfer on the IEEE-488 interface bus is ASCII. This type of transfer utilizes ASCII
mnemonics to control the monitor. The termination may be CR, LF (Carriage Return, Line Feed)
or LF (Line Feed) or EOI (End or Identify) set on the last character of the transfer. These
mnemonics may be strung together using a semicolon. Another type of data transfer supported
by the WJ-9205 Signal Monitor is binary. This type of data transfer allows single information
bytes to control the monitor. In the binary operation, a command or group of commands must
end with EOI (End or Identity) set on the last byte of the command. Commands may not be
strung together with a semicolon or terminated with CR (Cartiage Return) or LF (Line Feed).
The ASCII operation format tends to be self..,documenting and easy to understand. Binary, on the
other hand, lessens the number of bytes that must be transferred and has a faster execution
speed. In the ASCII format, the message consists of a series of data bytes that form one of the
mnemonics listed in Table 2-4. Each byte is one ASCII character of the mnemonic. When the
mnemonic contains a variable value, the mnemonic is followed by a number representing that
value. Each digit of the number is applied as a separate ASCII character. In the binary format,
the mnemonic is one 8-bit byte containing the hexadecimal code corresponding to the mnemonic.
When a. variable value is to be included in the message, it is sent as one or more additional data
bytes, representing the binary or hexadecimal value. During ASCII operation, only ASCII
commands are valid and only ASCII responses are returned. In binary operation, only binary
commands are valid and only binary responses are returned.
2.5.1 GENERAL DESCRIPTION
The command columns of Table 2-4 depict messages that. can be sent to the
WJ-9205 Signal Monitor as an active listener. Responses are messages returned when the monitor
is an active talker. ASCII messages may be sent with embedded spaces or any combination of
upper and lower case characters. In the binary mode, no blanks are allowed in the binary
message. The system starts in ASCII mode and enters the binary mode by the receipt of the BIN
command. The binary command 55 (REX) (85 decimal) returns the system to the ASCII mode of
operation.
2-13

WJ-9205
INSTALLATION AND OPERATION
In addition to the mnemonics, the monitor responds to the 488 defined commands of
'SDC (selected device clear) and DCL (device clear). These commands cause the monitor to do a
power up reset, inclUding clearing the message buffers and sending an SRQ.
Table 2-4. Remote Mnemonics
Command Response Description
ASCII HEX DEC ASCII HEX DEC
ATT(a)
ATT? 80
BW(a)
BW?
BWC?
CLH
CLR
ERR?
HER?
INP(a)
INP?
LLO
LLO/
LLO?
7E(b)
4E(b)
9E
9E
CO
51
65(b)
C3
4B(b)
4D
F9
FA
FB
78(b)
.80
158
192
81
101
195
75
77
249
250
251
ATT(a)
BW(a)
BWC(c)
ERR(a)
HER(aaaa)
INP(a)
LLO
LLO/
7E(b)
4E(b)
9E(bb)
65(b)
C3(bbbb)
4B(b)
F9
FA
78(b)
158(bb)
101(b)
195(bbbb)
249
250
Selects the input attenuation
in 10 dB increments (0-7).
Requests the input attenuation
setting returns 0-7 for
XO-70 dB of attenuation.
Selects the bandwidth slot
(1-8).
Requests the selected bandwidth
slot (1-8).
Requests the selected bandwidth
size. ASCII returns are
up to 4 digits max (in kHz),
9999 is the highest value and
represents 9.9 MHz. Binary
returns a 2-byte binary number(in
kHz) with 65536 kHz
as the highest value and
represents 65 MHz.
Re-enables reporting of hardware
error(s) previously reported.
Select the default parameters,
clears display RAM,
clears program RAM, does not
issue an SRQ.
Requests the remote interface
error.
Requests the hardware error.
Selects the input source .
1-3= receiver inpt,lts
4 = memory
8 = X-y
o = no input selected (off)
Requests the selected input
source.
Selects local lockout.
Returns to local control mode.
Requests lockout status.
In local lockout.
In local control.
2-14

INSTALLATION AND OPERATION
WJ-9205
Table 2-4. Remote Mnemonics (Continued)
Command Response Description
ASCII HEX DEC ASCII HEX DEC
MSK(b) BD(b) 189 Sets the device status mask. Each
status byte bit may be masked off
separately by writing a binary "1"
in the corresponding location.
Bit
D7 Not Used
D6 SRQ
D5 Command Error
(ERR 23)
D4 Not Used
D3 Operation or
Mode Change
D2 Hardware Error
D1 Power Up
DO Not Used
RMT 81 129 Selects remote control mode.
RMT/ 82 130 Selects local control mode.
RMT? 83 131
RMT 81 129
Requests control mode.
In remote mode.
SP(a) BA 186
RMT/ 82 130 In local mode.
Selects the span (0-7)
SP? BC 188 SP(a) BC(b) 186(b) span width
MHz = nnnM
0
Requests
= autocenter
the selected
kHz = nnnK
STS? 92 146 STS(a) 92(b) 146(b) Requests device status
0
1 = power up
2 = hardware error
3 = remote interface error
4 = busy
5 = busy
6 = SRQ set by this unit
STY(a) C5 197 Stores selected trace to memory
TRC(a) OC(b) 12 Selects the trace II (1-3).
TRC? OE 14 Requests the trace #.
TRC(a) OC(b) 12
VER? 0 0 Requests equipment type and
software revision level.
VER
9205 -X.X.X
!IIUT~:::i: a = ASCll number followed by a delImiter
b =
c =
s =
a single Binary number
4 bytes of ASCII data representing a number
a string of messages separated by ; in response to a single query
2-15

WJ-9205
INSTALLATION AND OPERATION
2.6
ERRORS
2.6.1
LOCAL OPERATION
Should an error occur that is associated with the signal monitor during local
operation, the display window will indicate the last error condition that has been reported. A ht
of the error numbers, conditions and display messages are found in Table 2-3. Pressing the SHliT
key and then pressing the 2 key causes the last error condition to be displayed. Pressing these
two keys until no more errors are displayed, clears the error buffer and returns the signal monitor
display to' normal. .
2.6.2 REMOTE OPERATION
During remote operation, errors are identified when either the ERR? or HER?
query is sent. The ERR? query requests the signal monitor to send the status of the last remote
or communication error. The signal monitor responds with an error response as: ERR X
(X = 1- 7). The value of X is as follows:
Cause of Error
1
4
6
7
Input buffer over run
Invalid argument or Out of range
"?" or "I" invalid for command
Invalid mnemonic or binary command
The response to the hardware error query (HER?) uses the following- format: HER
Xl, X2, X3, X4. Where X is a decimal value (0-255) of a binary code. The following list indicates
the byte, bit value, and corresponding error condition.
Byte Xl
Bit Value Error Condition
0 1 DRD Failure
1 2 15V Line Low
2 4 15V Line High
3 8 DA Failure
4 16 5V Line Low
5 32 5V Line High
6 64 VCO Unlocked
7 128 +8V Line Low
2-16

INSTALLATION AND OPERATION
WJ-9205
Byte X2
o
1
2
3
4
5
6
7
1
2
4
8
16
32
64
128
.Error Condition
+8V Line High
+15V Line Low
+15V Line High
UART Self-test Failed
488 Self-test Failed
Not Used
RAM Failure
PROM Checksum Failed
Byte X3
o
1
2
3
4
5
6
7
1
2
4
8
16
32
64
128
Error Condition
-2kV Line Low
-2kV Line High
Option Not Installed
Software Failure
Not Used
Not Used
488 Execution Error
488 Command Error
Byte X4
o
1
2
3
4
5
6
7
1
2
4
8
16
32
64
128
Error Condition
488 Invalid Request
(Bits 1-7 are not
presently used.)
2.7 PREPARATION FOR RESHIPMENT
If the unit must be prepared for reshipment, the packaging methods should follow
the pattern established in the original shipment. If retained, the original materials can be reused
to a large extent, or at least provide guidance for the repackaging effort.
2-17

SECTIONm
CIRCUIT DESCRIPTION

WJ..,9205
CIRCUIT DESCRIPTION
SECTION ill
CIRCUIT DESCRIPTION
3.1 GENERAL
The WJ-9205 Signal Monitor is a multi-trace, microprocessor-controlled signal
monitor. The WJ-9205 provides from one to three signal traces with selectable resolution
bandwidths. Signal activity displayed on the signal monitor traces are automatically centered
and optimized. The signal monitor circuits can be divided into three sections: the RF section,
the digital section,and the power/display section. These sections are interconnected via the
Motherboard assembly (At). The Motherboard provides the electrical and physical connections
required for the signal monitor operation.
The WJ-9205 Signal Monitor is designed to provide a signal display for up to three
WJ-8615 Receivers. The following paragraphs describe the path a signal takes through the signal
monitor. This signal path is shown on Figure 3-1.
Received 21.4 MHz IF signals are applied to one of three BNC connectors (A1A7J1­
A1A7J3) on the signal monitor rear panel. These connectors provide a 50 ohm impedance for the
received signals. Signals at these connectors are directed to the Input Control assembly (AlA7).
Signals applied to the Input Control module are applied to the Input Select/Step Attenuator
(A1A7A1). This module determines which input signal is to be processed. The selected signal can
be attenuated from 0 dB to 70 dB in 10 dB steps before being applied to the Input Filter assembly
(A1A7A2).
Input Filter assembly (AlA7A2) provides isolation and low-pass filtering of the
selected input signal. From the Input Filter assembly the signal is directed to the Frequency
Converter/Sweep assembly (AlAS). The input signal is applied to J1 of the First LO/First
Converter/Auto Center subassembly (A1A8A1). This subassembly mixes the RF signal from the
Input Filter assembly with the 118.1 MHz First LO, producing a 96.7 MHz First IF. The First IF
is bandpass filtered before being applied to the Second LO/Second Converter (A1A8A2). The
Second LO/Second Converter low-pass filters the First IF signal before it is mixed with an 86
MHz signal, producing the 10.7 MHz Second IF. The Second IF is applied to the Second IF/lO kHz
RBW subassembly (A1A8A3). This subassembly bandpass filters the 10.7 MHz Second IF before
amplifying the IF signal. After amplification, the Second IF is again bandpass filtered, providing
the video resolution bandwidth before being directed to the LOG IF Amplifier/Detector (A1AIO).
Post filtered 10.7 MHz Second IF signals are low-pass filtered before being buffered and applied
to the successive detector network. The output of the Successive detector network is amplified
and applied to the LOG amplifier. The output voltage (0 to 5 Vdc) is applied to the display
section to provide the vertical deflection for the CRT.
Control of the signal monitor operation is provided via the digital section. The
digital section contains the operating program, the microprocessor, and the display memory
storage. The Microprocessor assembly (A1A1) contains the operating program (stored in
EPROM), the microprocessor and the bus controller devices. The microprocessor controls the
signal monitor operation using the operating program stored in EPROM. The Operating status of
the signal monitor is stored in RAM. Timing for signal monitor operations is provided by the
Microprocessor assembly. Data to and from the Microprocessor assembly pass through the
Input/Output assembly (A1A4). Front panel control data, display data, synthesizer data, resolution
bandwidth data, input selection, and attenuation selection all pass through the Input/Output
assembly. Data is directed through the Input/Output module to the proper assembly.
3-1

CIRCUIT DESCRIPTION
WJ-9205
The Data Acquisition assembly (A1A2) provides the 1024 data points the signal
monitor uses to produce the video trace. The signal level at each of the 1024 data points is
determined and converted from an analog level to a digital word and stored in the DRD (digjtally
refreshed display) memory. Digital Refreshed/Display Timing Control assembly (A1A3) stores
1024 discrete data points in memory. These data points are used to produce the video display.
The High Voltage Power Supply/Video assembly (A2) provides the voltages required
to operate the CRT (cathode ray tube). Voltages provided by the High Voltage Power Supply
include the filament voltage, the cathode voltage, the accelerator voltage, the high voltage
sample voltage, and the horizontal and vertical voltages.
The Low Voltage Power Supply (A3) provides the supply voltages used by the other
signal monitor assemblies.
I
+2dB
-.5 dB
-6dB
96.7MHZ
. +t2.5dB
-4dB
IO.7MHZ:
I
-6dB
I
III
I
IIIIIIII
-.j dB +14dB 60dB
RANGE
J2
J3
AIA7AI
I. II
AIA1A2
41A8AI
AIA8
AIA8A2
AIA8A3 : AtA,O
Figure 3-1. WJ-9205 Signal Flow Block Diagram
3.2 DETAILED CIRCUIT DESCRIPTION
3.2.1 TYPE 796534-1 MICROPROCESSOR (AlAI)
Refer to Figure 6-2 for the Type 795634-1 schematic diagram. The reference
designation for the Microprocessor module is AlAI. Refer to Figure 3-2 for the Microprocessor
block diagram.
The Microprocessor module (AlAI) contains the signal monitor operating software,
the memory storage, and the software program for the signal monitor operation. Microprocessor
US controls the operation of the signal monitor via the address bus lines (AO-A15) and the data
bus lines (DI/OO-DI!07). Using the address lines, the microprocessor selects one device on the
bus to receive data from (read) or send data to (write). This allows the microprocessor to control
the signal monitor operations. The logic level of the microprocessor read/write line (pin 36)
determines whether the device addressed is written to or read from. When this line is High, the
selected device is read from and when the line is Low, the device is written to. The
microprocessor internally divides the 5.24 MHz oscillator frequency by four, producing a clock
3-2

WJ-9205 CIRCUIT DESCRIPTION .
frequency of 1.31 MHz. Two clock outputs are provided from the microprocessor" ~he quadrature
clock (Q) arid the enable clock (E). These clocks are used to establish and synchronizfa timing
throughout the signal monitor circuits•
..-------.E
.-----.0
_.....................,
.---~--~-~-----------------~~~__l
•. RJIN
OSC J----......,-t
Y1
MICRO­
PROCESSOR
U8
HEADER
U7
ADDRESS BUS
DATA
BUS
XCVR
U14
POWER
ON/FAil
01-03
CR1-CR3··
U11
RAM
U5
INTERRUPTS
ADDRESS
BUS
U14
ONE SHOT
U19
ADDRESS
DECODER
U16
MWAIT
Figure 3-2. Microprocessor Block Diagram
The signal monitor operating program· is contained in Erasable Programmable Read
Only Memory (EPROM) U1. This device contains the operating software used to control the
signal monitor operation. Random Access Memory (RAM) U5 stores the current signal monitor
operating status. It also maintains the signal monitor operating status present at the time power
is turned off. RAM memory is maintained viaback-up battery BTl and its associated circuitry.
3-3

CIRCUIT DESCRIPTION
WJ-9205
When power is turned off, the +5 Vdc supply voltage drops below the accepted level.
The change in voltage is sensed by the" power up/down circuit (Ql..,Q3, CRI-CR3, Ull, and their
associated components). When the supply voltage drops below the level established by R7, the
power up/down circuit forces the output of UllE and UllF Low. This Low is applied to the NMI
(non-maskable interrupt) and the RESET lines of microprocessorU8, halting its operation. This
same Low is also directed to jumperwires JW5-JW7, to place the device installed in the
associated socket in a high impedance state. With these devices disabled, the +2.8 Vdc back-up
battery voltage is directed to the installed memory device via jumperwires JWI-JW3. The backup
battery is used to maintain the data stored in these inemory devices while power is off.
When power is restored to the signal monitor, the output from UllE and UllF is
forced High and the microprocessor resumes normal operation. The data stored in the RAM
device i~ accessed by the microprocessor, returning the signal monitor to the operating parameterspresent
at the time of power interruption.
Microprocessor U8 useS different address locations to select the device with which
the microprocessor is to communicate. Table 3-1 lists the address (in HEX format) and the
device selected. Depending on the logic level of the read/write line (pin 36), the device
addressed is either read from (logic High) or written to (logic Low).
Table 3-1. Device Address Selection
Address
Device Selected
EOOO-FFFF
EPROM Ul
COOO-DFFF
U2 (SPARE)
AOOO-BFFF
U4 (SPARE)
8000-8FFF
RAM U5
6000-7FFF
Video RAM
4000-5FFF
Reserved
0OOO-3FFF
I/O Addresses
0080-0084 ADC U15
1000-1020 IEEE-488 Device
Address bus lines AO-AI5 are connected to EPROM UI, RAM U5 (EPROM and"
RAM), address decoder U16, and bus drivers U14 and U15. Address decoder U16 further decodes
the address, allowing five address lines to select one of eight devices. Bus drivers U13-U15
provide the required output level to drive the other modules connected to the address bus. The
address bus lines are connected, via the Motherboard, to other modules within the signal monitor
(SM). This allows the microprocessQr to communicate with the other modules, providing overall
control of the signal monitor operation.
3-4

WJ-9205
CIRCUIT DESCRIPTION
Reading the following address locations, the microprocessor can determine the
operating status of the signal monitor.
Read Address
0088
0089
008A
Parameter Checked
Keyboard Input
Resolution Bandwidth
Interrupt Status
Using the following write addresses, the microprocessor can update the parameters
located in the addressed memory location. After the microprocessor writes to the address, data
can be sent to change the current parameter.
Write Address
0090
0091
0092
0098
0099
009A
009B
009C
009D
009E
0800-080C
Parameter Addressed
Lock/Hold
Reset Clock
Reset Keyboard
Input Selector/Attenuator
Resolution Bandwidth
Synthesizer
LED Display Position
LED Display Data
LED Display Controller
Interrupt Mask
Video Display Data
Inactive data and address bus lines are pulled High via pull-up resistors U3, U6, and
U9. The pull-up resistors prevent the bus lines from being loaded by inactive lines.
Flip-flopU19 acts as a pulse stretcher, introducing a time delay that allows the
optional IEEE-488 moduie time to process data from slower devices that may be on the external
IEEE-488 bus.
3.2.2 TYPE 796537-1 INPUT/OUTPUT (A1A4)
The reference designation for the Input/Output module (I/O) isAIA4. Refer to
Figure 6-5 for the Type 796537-1 I/O module schematic diagram. Refer to Figure 3-3 for the
Input/Output block diagram.
Signal monitor data and control signals pass through the I/O (Input/Output) mOdule.
The Input/Output module provides the interface between the different sections and modules.
Signals passing through the I/O module include front panel display data, pushbutton data, address
data, remote commands, interrupts, resolution bandwidth·· (RBW) data, input selection, and
attenuator control. Audible beeper LSI is located on this module. The beeper produces an
audible tone when an invalid parameter is attempted to be entered or when a parameter is
attempted to be set beyond its limit.
3-5

~
I
en
E
Ao·A 2
IOEO
A3.A6.
TO U15
BEEPER
LSI
ADDRESS
TOU8 ADC ADDRESS ADDRESS
DECODER 80-87
TOU9
DECODER! 9 ·97 DECODER/
U14
U15 DEMUX U8-U10
TOU10
U14
88-8F
• F
DATA
CONTROL
U20
(DISPLAY
FRONT
PANEL)
DISP1
DISP4
D
A
T
A
B
U
S
()-::tl
()
c:::-~
t::l
t:;j
rn
()
::tl
:;
~
(5
Z
o
A
T
A
B
U
S
LINE
DRIVER
U19
(KEYBOARD)
LINE
DRIVER
U27
(RBWACK)
LINE
DRIVER
U17
KEYBOARD DATA
88 KEYBOARD
RBW6
-'---
'41 ACKO-ACK6 '
89
8A
IRQO-IRQ7
RBW ACK
IRQ STATUS
DATA
9AI LATCH
U25
(SYNTHESIZER)
DATA
, LATCH
U26
(RBW)
,I RBWO·
RBW6
DO
07
LINE
DRIVER
U18
(INTERRUPT)
IRQ
FLlP·FLOP
U24
(INPUT ATTN)
~ : X-YENABLE
INPUT (1-3)
, ATTEN (0·70)
Figure 3-3. Input/Output Block Diagram
:s
~
I
co
too:)
Q
(II

WJ-9205
CIRCUIT DESCRIPTION
Data is transferred to or from the I/O modUle via the eight data bus lines (DI/OO­
DI/07). Data is applied to the I/O module data bus via connector PI pins 7-14. Bi-directional
data transceiver U13 provides the necessary bus drive level. The logic level of the read/write
line (connector PI pin 36) determines the direction of data flow through U13. With the
read/write line Low, external data is applied from the data bus to the I/O module. When the
read/write line is High, data is directed out of the I/O module onto the data bus.
Address select lines AO-A6 determine which device on the I/O module is enabled.
Address lines AO-A2 are used to select one of the eight inputs of analog-to-digital converter U15
and enable one of the eight outputs from decoder/demultiplexers U8-UI0. Address lines A3-A6
are used to select the different outputs of decoder/demultiplexer U14. Outputs from U14
determine which device (U8..:UI0) is enabled.
Outputs .from decoder/demultiplexers U8-U10 are used to latch data to or from
hardware interface registers or to reset interrupt flip flops. The following list indicates the
output enabled, the device selected, the interrupt to be reset, data to be read or updated, and the
function performed.
Output Device Selected Data Updated Function
U8 YO Octal Buffer U19 Keyboard Read
U8 Yl Octal Buffer U27 RBW Acknowledge Read
U8 Y2 Octal Buffer U17 IRQ Status Read
U9 YO Buffer/Driver UllB Lock/lIold Read
U9 Y1 Buffer/Driver UllA Timer Reset Write
U9 Y2 Buffer/Driver U7A Keyboard IRQ Reset Reset
UI0 YO Buffer/Driver U24 Input/Attenuation Reset
UI0 Y1 Buffer/Driver U26 RBWSelection Write
UI0 Y2 Buffer/Driver U25 Synth. Address/Data Write
UI0 Y3 Buffer/Driver U20 Display Address Write
UI0 Y4 Buffer/Driver U21 Display Data Write
UI0 Y5 Buffer/Driver U22 Display Control and Write
Beeper
U10Y6 Buffer/Driver U18 InterrUpt Enable .Mask Write
Analog-to-digital converter (ADC) U15 is used to perform the internal BITE testing
of the power supplies. If any of the tested voltages are out of tolerance, an error code is
generated and the failed voltage is temporarily displayed on the front panel. The digital output
from U15 is present on the data bus after conversion is completed.
The timer, lock detect, and the interrupts (connector PI pins 60-67) are sent to line
driver U17 and to AND gates U4 and U5. Interrupts from the remote interfaces, data acquisition,
the keyboard, or the digitally refreshed display (if enabled) cause an interrupt (IRQ) to be output
(connector PI pin 44), to the microprocessor. The interrupt indicates that a status change has
occurred. Microprocessor AlAI U8 directs the IRQ chip U17 to output IRQ data to DI/OO
through DI/07 (PI, pins 7 through 14). The microprocessor then reads these data lines to
interpret what device caused the interrupt. Table 3-2 lists the interrupt and the function causing
the interrupt to be set.
3-7

CIRCUIT DESCRIPTION
WJ-9205
Table 3-2. Interrupt~
Interrupt
IRQ 0
IRQ 1
IRQ 2
IRQ 3
IRQ 4
IRQ 5
IRQ 6
IRQ 7
Cause of Interrupt
Keyboard pushbutton pressed
DRD refresh complete
Data acquisition cycle complete
IEEE-488 remote I/O message
Remote serial message
Synthesizer lock detector
Waiting for slower device
Not used
'3.2.3
TYPE 796535-1 DATA ACQUISITION' (AIA2)
Refer to Figure 6-3 for the Type 796535-1 Data Acquisition assembly schematic
diagram. The reference designation for the Data Acquisition assembly is AIA2. Refer to
Figure 3-4 for'the Data Acquisition block diagram.
LOG
VIDEO
PEAK
DETECT
& DI,JMp
U20, U18
ADC
U16
.---_-.VCO
SWEEP
FLlP-
FLIP-
FLOP FLOP + 15V -15V
U1
U7
A1, A10-A12
DAC
U6
REF
VOLTAGE
SEL
U21
MULTI­
PLEXER
U4
A2-A9
DAC
U6
INEARIZERI
LP FILTER
U9,U10
un
Figure 3-4. Data Acquisition Block Diagram
3-8

WJ-9205
CIRCUIT DESCRIPTION
The Data Acquisition assembly is composed of three major circuits:
detect and dump circuit, the ramp generator circuit, and the sweep generator circuit.
the peak
Operation of the Data Acquisition assembly is initiated by the microprocessor.
Microprocessor assembly AlAI sets the RST DA line (connector PI pin 59) Low. This Low resets
flip-flop UI5A, which in turn resets binary counter U2. When U2 is reset, it begins counting up.
At a count of 1024, an output pulse is present at Qll. This output pulse clocks U15A. With U15A
clocked, its output changes state. This causes IRQl to be sent to the I/O module, indicating that
data acquisition is complete and also resets U2. U2 begins counting up again when clocked by a
Low on connector PI pin 58 (ADDR INC). When U2 is clocked, it provides the sweep address and
counts up to a count of 1024. Clocked outputs from U2 are applied to line drivers U13 and U14
and to flip-flops U3 and U8.Pulses from U3 and U8 are directed to digital-to-analog converter
(DAC) U6. Analog voltage outputs from DAC U6are amplified by UlOA and low pass filtered
before being applied to the voltage divider network (R13-R19). This voltage divider network
provides the eight signal monitor sweep spans from 0 to 5 MHz. The VCO SWEEP output from U4
is routed to the Frequency Converter Sweep Ass~mbly(AlA8).
The reference voltage for DAC U6 is either positive (+5 Vdc) or negative (-5 Vdc).
Polarity of the reference voltage selection is determined by the position of jumperwire JWl.
Coimecting JWl to the Y output of U2l selects the positive reference voltage. Connecting JWl
to the y* output selects the negative reference voltage.
NOTE
On the WJ-8615 Receiver, a sweep reversal is
encountered at frequencies above 500 MHz. To
accommodate this sweep reversal the DAC
reference voltage is reversed in the WJ-9205
Signal Monitor~
IN1 and IN2 are used to select the input source. D,epending on the logic level at
connector P2 pins 11 and 12, one of the three input sources is selected. 'The selected source is
indicated via a Low at connector :£>2 pin 10, 9, or 8 for source 1, 2, or 3 respectively.
The LOG VIDEO signal at connector P2 phi 4 is amplified by U20A before being
applied to electronic switch U1a. Amplifier U20 (A and B), switch U18 (A and B), and their
associated components form the peak detect and dump circuit. The input LOG VIDEO, from the
LOG IF, is.a voltage from 0 Vdc to slightly less than 5 Vdc. . .
The peak detect and dump circuit samples 1024 discrete data points and produces
peak output for each data point. The peak voltage outptit is directed to analog-ta-digital
converter U16•. U16 converts each peak data point to an 8-bit data word. Output data from U16
is present on the data input/output bus (DI/OO-DII07). This data is then stored in the digitally
refreshed display (DRD) memory. Data lines 01/00-01/02 are also applied to flip-flops Ul and
U7. Data is sent to Ul to select the signal monitor sweep span. The data applied to U7 is
directed to line drive U13 and onto the address bus.
3-9

CIRCUIT DESCRIPTION
WJ-9205
3.2.4 TYPE 796536-1 DIGITAL REFRESHED DISPLAY/TIMING CONTROL (A1A3)
Refer to Figure 6~4 for the Type 796536-1 Digital Refreshed Display/Timing
Control schematic diagram. The reference designation for the DRD/Timing Control is A1A3.
Refer to Figure 3-5 for the DRD/Timing Control block diagram.
Digital Refreshed Display/Timing Controller AIA3 provides the memory storage for
the video display and provides the timing circuits to produce the video display. Data and address
information is 'received via connector PI pins 7-30. The data bus connects U9, U15, U17, U20,
and U24 together. The address bus interconnects U2, 03, U14, and U18. Using the address lines,
the microprocessor enables one device on the address bus at a time. Address lines AI-A3 are
used to enable oile of seven outputs from U14. When the DRD/Timing Control module is written
to, a Low from connector PI pin 31 is present at OR gate U19B and at decoder/demultiplexer
U14. With U14 pin 5 also Low, address lines AI-A3 determine which output from U14 is enabled.
The enabled output from U14 is a logic Low. The Low is directed to the associated device as a
clock Or other control input. The following list indicates the output from U14 and the device
affected by the output.
'
* Indicates Active Low Signal
RlWR
DATA BUS DO-D7
DATA
LATCH
U15
DO-D7
J--.....I---...
DAC
U16
VIDEO(Y)
L
ADDRESS
DECODER
U14
1---~TOU9
1----.TO U24
1---~TOU20
j---,TOU4A
ADDRESS
BUS
DRIVER
U2
Q1-QB
ADDRESS
BUS
DRIVER
U3
E
TIMER STATE
MACHINE
U48,U6,U7, ,
U10A&B,
U11,U12
TIMER 9,Q10
U1
Figure 3-5. DRDlTiming Control Block Diagram
3-10

WJ-9205
CIRCUIT DESCRIPTION
Output
YO
Yl
Y2
Y3
Y4
Y5
Y6
Y7
Function
Clock
Write Enable
Clock
Reset
Reset
Interrupt
Clock
Grounded
Device Affected
Flip-flop U9
DAC U24
Flip-flop U20
Flip-flop U4A
Flip-flop U15 (AIA2)
Line drive U17 (AIA4)
Flip-flop Ul (AIA2)
None
Data from the data bus is directed through line driver U17. With a Low on U17
pin 1, data is directed from the B ports to the A ports. This allows data to be stored in memory
device U18. U18 stores the 1024 data points for the video image. Each data point is written into
U18 and stored. Once the data has been stored, the microprocessor writes to the DRD RAM
address (6000-7FFF). With the DRD RAM line Low (connector PI pin 49) and the read (RD) line
Low, U18 directs data stored in its memory to line driver U17. The video data is directed
through U17 onto the data bus.
Video data is directed to display page selector U9, to flip-flop U15 and to DAC
U24. U9 is used to display the video signal for the selected trace. Display selected data from U9
is applied through U3 onto the address bus by a Low to High transition of the Q output from flipflop
UI0B. The Low-to-High transition from UI0B also clocks data from the data bus through
U15 to DAC U16. Digital-to-analog converter U16 converts the digital video data to an analog
voltage. This analog voltage is applied to either the inverting or noninverting input of U21B.
Video data present at the inputs of DAC U24 are converted to an analog voltage
when the Yl output from U14 is Low. When this occurs, U24 writes to either the A output or the
B output. The output written to is determined by address line AO. Output A from U24 provides
the reference voltage for DAC U16. Output B provides the other analog voltage input for U21B.
The output from U21B is low pass filtered via U22A and U22B and their associated components
before being applied to connector P2 pins 11 and 12 as the VIDEO (Y) for the CRT display. The
SWEEP (X) output at connecto:r P2 pins 7 and 8 is generated when the Y3 output from U14 is Low.
The Lowfrom U14 resetsflip~flop U4A, clocking U27A. The Q output from U27A is directed out
connector PI pin 61 as the interrupt request. The output from U27A is directed to amplifier
U22D and also to transistor Ql. From Ql, the output voltage is amplified by U23A and U23B
before beingapplied out connector P2 pins 7 and 8 as the SWEEP (X) output for the CRT display.
Timing for the video display is provided by: U4B, U7, U6, U12, U11, UI0A, and
UI0B. These devices form the timing control circuit. The timing circuit is initiated via the
enable (E*) clock (connectorP2' pin 38) being applied to counter U7. U7 starts counting up to a
count of 1024. Outputs from U7 are directed to multiplexer U6, decoder/demultiplexer U12, and
flip-flop U11. Data bus lines DO-D7 at U20 are used to select an input to U6 from counter U7.
The output from U6 is sent through U11 to set flip-flop UI0B. Other outputs from U11 are used
to clock binary counter Ul or cause the Data Acquisition module (AIA2) to HOLD {connector PI
pin 58)or DUMP (connector PI pin 57) the analog voltage level at the input to ADC U16.
3-11

CIRCUIT DESCRIPTION
WJ-9205
3.2.5 TYPE 796561-1 INPUT CONTROL (A1A7)
Refer to Figure 6-7 for the Type 796561-1 Input Control assembly schematic
diagram. The reference designation for the Input Control assembly is AIA7. Refer to Figures
3-6 thru 3-8 for the Input Control block diagram.
The Input Control assembly contains the Input Select/Step Attenuator (AIA7Al)
and the Input Filter (A1A7A2). The Input Select/Step Attenuator (AIA7Al) selects the input
signal source (Jl thru J3), which is the IF input from the receivers, for display on the signal
monitor CRT. It also provides from 0 to 70 dB of attenuation of the received signal. Output
signals from the Input Select/Step Attenuator are applied to the Input Filter module (AIA7A2).
The Input Filter provides low pass filtering of the received input signal.
J1
J2
J3
INPUT
SELECTISTEP
ATTENUATOR
A1
E1O-+---~I---oE1
INPUT
FILTER
A2
E.2o-----,.---.SELECTED RF
INPUT
IN1 IN2 IN3 10 ~o 40
ATTEN
Figure 3-6. Input Control Block Diilgram
Refer to Figure 6-8 for the Type 79~500-1 Input Selector/Step Attenuation
Assembly schematic diagram. The IF signals from the rear panel connectors (JI-J3) are
capacitively coupled to a diode switching network. As shown on the block diagram (Figure 3-7)
the input selection is controlled by signals. INI thru IN3. To select INPUT 1 (Jl), a Low logic
level is applied to the input (pin 9 of connector PI). Refer to the- following list for the INPUT
selection.
Input
Selection
Elof
Input
Voltage Levels
IN1{E7) IN2{E6) IN3{E5)
AIA7Jl
AIA7J2
AIA7J3
Ell
E12
E14
L
H
H
H
L
H
H
H
L
3-12

WJ-9205
CIRCUIT DESCRIPTION
The selected input is coupled by capacitor C29 to a three-step attenuation circuit.
'rhe attenuation circuits are switched in or out by the 10 dB(E4), 20 dB(E3), and 40 dB(E2) control
signals. As shown by Figure 3~7, The 10 dB signal at E4 is used to switch the 10 dB attenuation
circuit. A logic Low bypasses the attenuation resistor network and when E4 is High, the RF input
is routed through the 10 dB attenuator. WhenE3 is Low, the 20 dB attenuation network is
bypassed and when E3 is lligh, the input signal is routed through the 20 dB attenuator. When E2
is Low, the 40 dB attenuation network is bypassed and when E2 is High the input signal is routed
through the 40 dB attenuator.
IN3
IN2
DIODE
SWITCH
CR9-CR12
10dB 20dB 40dB
J I I
DIODE DIODE DIODE DIODE
SWITCH
10dB
20dB
SWITCH
SWITCH
SWITCH
CR5-CR8
ATTEN
ATTEN
CR13-
CR17-
CR21-
CR16 CR20 CR24
40dB
ATTEN
I
I
IL ________________
DIODE
El
-------
INl SWITCH OUTPUT
CR1-CR4
Figure 3-7. Input Select/Step Attenuator Block Diagram
For the example shown on Figure 3-7, E4 and E2 are both Low and results in the
input signal being attenuated by 50 dB. The foilowing list indicates the logic levels required to
select attenuation levels from 10 dB to 70 dB.
Attenuation
Logic Levels
(in dB) E4 E3 E2
0 L L L
10 H L L
20 L H L
30 H H L
40 L L H
50 H L H
60 L H H
70 H H H
3-13

CIRCUIT DESCRIPTION
WJ-9205
To select 10 dB of attenuation, a logic level High is applied to E4 (connector PI
pin 10). This logic level is resistively coupled to the inverting input of amplifier U2A and the
noninverting input of amplifier U2D. A logic level High at E4 is inverted to a Low through U2A,
reverse biasing CR13 and CR15. The logic level from E4 through U2D forward biaSes diodes.
CR14 and CR16. This directs the input signal through the 10 dB resistive network (comprised of
ij,39, R40, R4l). The input signal is capacitively coupled from one attenuator section to the next.
Selecting an attenuation greater than 10 dB enables another section, or a combination of the
three sections.
Whether attenuated or not, the selected INPUT signal is directed from El of
AlA7Al to El of the Input Filter (AlA7A2). Refer to Figure 6-9 for the Input Filter schematic
diagram. The input signal is capacitively coupled to isolation, buffer amplifiers Ql and Q2 before
being appliedto the primary of transformerTl. Signals from the secondary of Tl are low pass
filtered before being applied out E2 to the First Converter/Sweep assembly (AlAS).
The low-pass filter is comprised of capacitors Cl-C5 and inductors Ll-L4.
Frequencies less than 27 MHz are passed with a minimum of attenuation. At 27 MHz, the input
signal is attenuated by approximately 3 dB. Signals greater than 27 MHz are increasingly
attenuated up toa ms:ximum of approximately 50 dB.
LOW-PASS
FILTER
ISOLATION
T1
El AMP
~ E2
IN Q1,Q2 OUT
U-L4,C1-C5
Figure 3-8. Input Filter Block·Diagram
3.2.6 TYPE 796562-1 FREQUENCY CONVERTER/SWEEP (AIA8)
Refer to Figure 6-10 for the Type. 796562-1 Frequency Converter schematic
diagram. The reference designation for the Frequency Converter/Sweep assembly is AlAS.
Refer to Figure 3-9 for the Frequency Converter/Sweep Assembly block diagram.
The Frequency Converter/Sweep assembly is comprised of three subassemblies and
a bandpass filter. The three subassemblies are the First LO/First Converter/Auto Centering, the
Second LO/Second Converter, and the Second IF/RBW. These subassemblies receive the selected
IF input and mix the 21.4 MHz RF with the 118.1 MHz First LO frequency to produce the 96.7
MHz First IF. The First IF is bandpass filtered before being mixed with 86 MHz to produce the
10.7 MHz Second IF. The Second IF is bandpass filtered, providing a resolution bandwidth (RBW)
of 10 kHz.
3-14

WJ...:9205
CIRCUIT DESCRIPTION
RF
INPUT
21.4 MHz
J1
_~QQfiE5~ ~~!~!._
FREQUENCY
DATA STROBE·
1ST LOI
FIRST CONVERTER!
AUTOCENTER
E70--11---1
BANDPASS
FILTER
Ll-L7, C22"C24
2NDLO .
2ND CONVERTER
1--1-0E1
(A1A8A2)
E40-+--1---o E1
2ND IFI
RW (10KHz)
(AlA8A3)
E4
RBW
ACK
LOCK DETECT
ACK 2, LOCK/*
HOLD*RBW2
. (A1A8A1)
POST-FILTERED
10.7 MHZIF
P2, PIN 19
Figure 3-9. Frequency Converter/Sweep Assembly Block Diagram
3.2.6.1 Type 796540-1 First LO/First Converter/Auto Centering.Assembly (A1A8Al)
Refer to Figure 6-11 for the Type 796540-1 First LO/First Converter/Auto
Centering schematic diagram. The reference designation for the First LO/First Converter/Auto
Centering assembly is A1A8Al. Refer to Figure 3...;.10 for the First Converter/Auto Centering
block diagram.
Sel.ected input IF signals from E2 of the Input Filter assembly (AlA7A2) are routed
directly from E6 (RF IN) to double balanced mixer U5. The other input to U5 is the synthesized
118.1 MHz. The output from mixer U5 is the 96.7 MHz First IF.
The synthesized frequency is determined by the phase-locked-loop (PLL) frequency
synthesizer U8. PLL frequency synthesizer U8 uses a 5 MHz crystal oscillator (Yi) for a
reference frequency. Input data (E9-BI6) determines the preset division ratio of the two internal
dividers and seh~cts the internal latches. This data is USed to preset the two internal dividers (+A
and +N) in U8.
The frequency at pin 3 (f IN) is from the voltage controlled oscillator (VCO).
Transistor Q1, transmission line DL1, variable capacitance (varlcap) diodes CR2-CR5, and the
associated components form the VCO. The transmission line oscillator produces the 118.1 MHz
(±2.5 MHz) VCO frequency. The output VCO frequency is amplified by U2 before being applied to
divide by 10/11 prescaler U9. From U9, the VCO frequericy is applied to PLL frequency
synthesizer U8.
3-15

W
I
I-'
0">
E2
o
SWEEP IN
i
()
....
~
()
c::
:=3
t:l
~
()
::tl
;
1;7 ~
o 0
IFOUT
96.7
MHZ
Z
E8 ~ FLlP·FLOP I • i
o
U1S
LOCK/HOLD
E4
LOCK
DETECT
LOCK trj ERROR
DECTECTSWITCH
U16, U14A
U17,U18·· U14B
SAMPLE
AND
HOLD
U12
TRANS
LINE
OSC
CR2·CRS
DL1,Q1
E9·E16
0V 0R
FREQ.
SYNTH
U8
PLL
OSC
Y1
+ 10/11
U9
PRESCALER
Figur~
3-10. First LO/First ConverterlAuto Centering Block Diagram
~ c...
i
CD
~
Cl
'"

WJ-9205
CIRCUIT DESCRIPT10N
U8 divides the input YCO frequency and compares it with the divided crystal
oscillator frequency. When both frequencies are the same, a lock condition exists. During a lock
condition, the phase detector outputs (pins 16 and 17) from U8 are essentially High. Applying a
logic High level to the lock detector circuit (composed ofU16, U17, U18, aild the associated
components) provides the LOCK DETECT output for the microprocessor. A High at the LOCK
DETECT indicates that the frequency is centered. Phase detector outputs from U8 are also
directed to the error switch circuit (composed of U14A, U14B, and the associated components).
From the error switch, the error signal is routed through integrator U13 to the sample and hold
circuit (composed of U12 and C35). The error voltage from U13 is applied to U12, causing
capacitor C35 to charge to the value of the error voltage. The output from the sample and hold
amplifier (U12) is applied through scaling amplifier U10 to variable capacitance (varicap) diodes
CR2-CR5. The error voltage is used to· vary the capacitance of the diodes. Changing the
capacitance of the varicap diodes tunes the YCO frequency. Changing the YCO frequency
reduces the phase detector (U8) output. When the phase detector error output is zero, the YCO is
locked on frequency.
Lock/hold flip-flop U15A is used to reset or hold the error voltage output from U12.
When the microprocessor receives the LOCK DETECT, a HOLD is sent to U15A. This HOLD
causes· the error switch (U14A and B) to appear open, allowing C35 to hold the error voltage level
that produced the lock. When the YCO is locked, the sweep is started. The signal at SWEEP IN is
resistively coupled through U10 and linearizer diodes CR6-CR9 before being applied to the YCO.
The YCO signal is amplified by the LO driver amplifier (composed of U2, Tl, U3, U4, T2, and the
associated components). The LO driver circuit provides a drive level of +17 dBm for the 118.1
MHz (±2.5 MHz) LO.
U5 mixes the RF input with the LO YCO, producing the 96.7 MHz First IF. The
mixer output is amplified by U6 before being directed out E7. The IF OUT from E7 is band-pass
filtered (LI-L7 and C19-C24) before being applied to the Second LO/Second Converter (A1A8A2).
3.2.6.2 Type 796541-1 Second LO/Second Converter (A1A8A2)
Refer to Figure 6-12 for the Type 796541-1 schematic diagram. The reference
designation for the Second LO/Second Converter is A1A8A2. Refers to Figure3-n for the
Second LO converter block diagram.
The 96.7 MHz First IF input at E1 is low pass filtered (C7-C9, L2, and L3),
attEmuated 3 dB, and then applied as one input to mixer U4. The other input to mixer U4 is
86 MHz from the third overtone crystal oscillator. The crystal oscillator (composed of Y1, Ql,
L1 and the asso.ciatedcomponents) pr'oduces an 86 MHz signal that is applied to the LO driver.
Oscillator outputs are applied to the LO driver circuit (composed of Ul, Tl, U2, and U3) for
amplification before. being transformer coupled across T2. From T2, the oscillator signal is
attenuated 3 dB (by R13-R15) before being mixed by U4. Mixer U4 produces the 10.7 MHz
Second IF. The 10.7 MHz Second IF is directed out E4 to the Second IF/10 kHz RBWsubassembly
(AIA8A3). ..
3-17

CIRCUIT DESCRIPTION
WJ-9205
OSCILLATOR
Y1.Q1
86MHz
86 MHz
LODRIVER
U1. T1. U2. U3
MIXERU4
E4
10.7 MHz
OUTPUT
E1 .96.7 MHz
0---.,....-;
IFINPUT
LOW PASS
-::\ I-----~~-----'
Figure 3-11. Second LO Converter Block Diagram
3.2.6.3
Type 796542-1 Second IF/RBW (AIA8A3)
Refer to Figure 6-13 for the Second IF/RBW (10 kHz) schematic diagram. The
reference designation for the Type 796542-1 Second IF/RBW subassembly is AIA8A3. Refer to
Figure 3-12 for the Second IF/RBW block diagram.
E2
RBW2
FILTER
SELECT
VR1.Q1
BANDPASS
E1 E:l
1OO.7-M-'-.-Hz---.--; .. FILTER
IF
F1
(PREcFILTERED)
BANDPASS
r----\ E4 10.7 MHz
.J ~.. ~~n L J----O IF
FlbTER
F2
(POST-FILTERED)
Figure 3-12. Second IF/RBW Block Diagram
3-18

WJ-9205
CIRCUIT DESCRIPTION
. The pre-filtered 10.7 MHz Second IF at E1 is attenuated 3 dB before being
capacitiveIy coupled across Cl. For the pre-filtered 10.7 MHz IF to be filtered, the logic level at
E2 (RBW 2) must be Low. Transistor Q1 then conducts forward biasing switching diodes CR1 and
CR2 which allows the 10.7 MHz IF to be filtered through bandpass filter FLI before being
amplified by U1 andU2. After amplification, the IF signal is bandpass filtered through FL2
before being coupled to E4.From E4, the post-filtered 10.7 MHz IF is directed to connector P2
pin 19. From P2 pin 19 the IF signal is directed to the optional Second IF A1A9 and to the LOG
IF Amplifier/Detector A1A10•
3.2.6.4 .IYPe 796790-1 Second IF/2 kHz RBW (AIA9) (Optional)
Refer to Figure 6-14 for the Second IF/2 kHz RBW schematic diagram. The
reference designation for the Type 796790-1 Optional Second IF/RWB 2 kHz subassembly is
AIA9~ Refer to Figure 3~13 for the optional Second IF/2 kHz RBW block diagram.
The pre-filtered 10.7 MHz IF signal is routed from the Frequency Converter/Sweep
Assembly to the Second IF/2 kHz RBW input at El. The optional Second IF/2 kHz RBW circuits
are enabled by a Low logic level at the control signal input (E2). The switch control operational
amplifier Ul is cbnfigured as a comparator and the Low level input causes its output to go to
+15 volts. This positive voltage turns on the transistor amplifier Ql as soon as the cutOff
threshold voltage at tlie base of transistbr Ql is exceeded. When Ql is turned on, the amplifiers
U2 and U3 are supplied with.power and the PIN diodes CR1 and CR2 are forward biased.
Once the Second IF/2 kHz RBW circuits have been activated, the unfiltered IF
signal is coupled through PIN diode CRI to the first amplifier stage U2. The input is also routed
through avariable attenuator pad consisting of resistors R18, R19, and R20. This attenuator pad
can be adjusted by R19 from approximately 3 dB to 6 dB. Amplifier U2 drives the bandpass filter
through a fixed 5 dB pad consisting of resistors R13, R14, and R16. This pad isolates the filter
from any mismatch caused by the variable attenuator pad. The signal is amplified by amplifier
U3 and coupled through the PIN diode output switch CR2 to the LOG JF Amplifier/Detector
(AlAlO).
E2 O---i
2 kHz
IF/RBW
SELECTION
. CIRCUIT
El
OUTPUT·
.~ . GATE
CRl
[7 . BANDPASS
ui
£:L
Fl
OUTPUT
GATE
CR2
E3
Figure 3-13. Optional Second IF/2 kHz RBW Block Diagram
3-19

CIRCUIT DESCRIPTION
WJ-9205
When the Second IF/2 kHz RBW assembly is not selected, a High logic level on the
select line RBWO causes the output of the comparator Ul to be below the threshold voltage that
keeps transistor switch turned off. As a result a negative voltage is applied to the power/bias
line for the Second IF/2 kHz RBW circuits. This reverse biasing of the PIN switch diodes ensures
that there is minimal interaction with the selected Resolution Bandwidth operation.
3.2.7 TYPE 796577-1 LOG IF AMPLIFIER/DETECTOR (A1A10)
Refer to Figure 6-15 for the LOG IF Amplifier/Detector schematic diagram. The
reference designation for the Type 796577-1 LOG IF Amplifier/Detector is AIAI0. Refer to
Figure 3-14 for the LOG IF/Detector block diagram.
LOG IF. Detector AIAI0Al (Type 796505-2) is located on the LOG IF Amplifier
Detector assembly (AIAIO). The post-filtered 10.7 MHz IF signal enters the LOG IF Detector
(AIAI0AI) at EI. Refer to Figure 6-16 for the LOG/IF/Detector schematic diagram. The IF
signal is low pass filtered before being buffered by Ql and applied to successive detectors UI-U7.
Each successive detector provides approximately 11 dB of gain control before saturating.
Combined the detectors provide more than 77 dB of gain range. The RF output of each stage
(pin 3) is coupled to the input (pin 6) of the next stage. The detected outputs (pin 4) are tied
together and applied to the summer/amplifier circuit (composed of U8, and U9). The output
voltage from U9B is present at E7 as the Y OUTPUT. This output voltage is from 0 to
approximately 5 Vdc and is determined by the input signal level. The output voltage from the
successive detectorS is also applied to the linearizer and is directed through U9A. The Y output
is routed to the peak detect and dump circuit on the data acquisition assembly (AIA2).
E1
10.7 MHz
IFOUTPUT
LOW PASS
-::\
BUFFER
SUCCESSIVE
.. Q1 ... DETECTOR
(U1-U7)
1 111 I I
PRECISION
VOLTAGE GAIN LOG E7
REGULATOR AMP --. AMP ""'"'
(Ul0) (U8A.U8B) (U9A. U9B) YOUTPUT
0-= 5VDC
Figure 3-14. LOG IF Detector Block Diagram
3-20

WJ-9205
CIRCUIT DESCRIPTION
3.2.8
TYPE 796538-1 REMOTE INTERFACE BOARD (A1A5) (OPTIONAL)
Refer to Figure 6-6 for the Remote Interface Board (A1A5) schematic diagram.
Refer to Figure 3-15 for the Remote Interface block diagram.
The Remote Interface Board (A1A5) is an optional unit that provides talk and listen
capabilities between the signal monitor and external controlling devices. The data is transferred
between the units in a bit-parallel, byte serial form utilizing sixteen interconnecting lines. These
lines consist of eight bi-directional data bus lines, three data byte transfer lines and five
management lines. Data or address information is transferred between devices utilizing the data
bus lines.
The data byte transfer lines indicate: the availability and validity of the
information on the data bus lines, if the devices are ready to accept data, and if the data has
been accepted. The interface management lines indicate: specify whether the data bus lines are
carrying address information, request service, clear the interface or indicate the end of a
transfer sequence. The capabilities of the IEEE-488 interface and the command format are
described in paragraph 2.5.
As shown on the block diagram Figure 3-15, the address and data bus as well as the
read/write control signal (R/W*) are input from the microprocessor to the General Purpose
Interface Bus (GPIB) processor U3 and the address decoder U6, U8, and address switch 81. When
the units address is received from the microprocessor or the controller during remote operation,
data is transferred to and from the data bus by GPIB transceiver Ul. In a similar manner, the
management control lines are handled by the GPIB transceiver U4. Through microprocessor to
microprocessor communications the signal monitor operation can be controlled and monitored by
remote control devices. The remote control interface module includes expansion circuits for
future· implementation of R8-232C and R8-449 interface capabilities.
3.2.9 TYPE 796539-1 KEYBOARD DI8PLAY (A4)
Refer to Figure 6-20 for the Keyboard Display schematic diagram.
designation for the Type 796539-1 Keyboard Display is A4.
The reference
Keyboard Display circuitry consists of the key encoder (U5), the alphanumeric
displays (U1-U4), the pushbuttons (81-813), and the two LEDs (D81 and D82).
Pressing one of the front panel pushbuttons (81-813) momentarily completes the
contact between the X andY inputs of key encoder U5•. When a pushbutton is pressed,encoder
U5 forces the DATA AVAL line (connector PI pin 6) High. With this line High, the
microprocessor reads the data at the DATA OUT (connector PI pins 1-5). The microprocessor
uses this data to update the displayed information. Writing new data to the Keyboard Display is
accomplished via writing the new, data onto the keyboard data bus (KDO-KD6).
3-21

CIRCUIT DESCRIPTION
WJ-9205
GPIB
PROCESSOR
U3
GPIB
DATA
TRANSCEIVER
U1
GPIB
CONTROL
TRANSCEIVER
U4
DATA
IEEE-488
INTERFACE
CONTROL
LINES
CPU
BUS
ADDRESS
DECODER
AND
COMPARA­
TOR
U6.U8
ADDRESS
DIP
SWITCH
Sl
FUTURE
OPTION
Figure·3-15. Remote Interface Block Diagram
Alphanumeric displays UI-U4 are four character, sixteen-segment displays. Logic
levels at KAO and KAI determine to which display digit the data is written. When both KAO and
KAI are Low, the far right digit (DGO) is selected. The following list indicates the digit select
(AO and AI) logic level to select the different display drivers (DGO-DG3).
AO
Al
DG3
DG2
DGI
DGO
L
L
H
H
L
H
L
H
SEL
SEL
SEL
SEL
Microprocessor control of the CLEAR, CUE, CURSR, CE, and WR lines allows the
microprocessor to update data in the selected display digit. Using the digit select lines and the
control lines, data on the keyboard data bus lines updates the front panel display. DISPI-DISP4
are used to select the display driver selected for updating. When the BLANK line is Low, the
front panel display is blanked.
3-22

WJ-9205
CIRCUIT DESCRIPTION
LED indicator DSI is used to indicate the control status (Local or Remote) of the
signal monitor. When DSI is illuminated the signal monitor is in remote control. This allows a
suitable controller to remotely operate the signal monitor. When this LED is extinguished, the
signal monitor is in local control. This allows the front panel pushbuttons to control the signal
monitor operation.
LED indicator DS2 illuminates to indicate the SHIFT function has been selected for
the front panel pushbuttons. Refer to Section n for an explanation of the SHIFT operation.
Pressing the SHIFT key illuminates the SHIFT LED and enables the Shift operation.
3.2.10 TYPE 796782:-1 HIGH VOLTAGE POWER SUPPLY!VIDEO (A2)
Refer to Figure 6-17 for the High Voltage Power Supply/Video schematic diagram.
The reference designation for the High Voltage Power Supply/Video assembly is A2.
This assembly contains Cathode Ray Tube (CRT) VI and the High Volt Power
Supply/Deflection Amplifier (A2Al). The CRT provides the video display for the sweep trace(s).
The High Volt Power Supply/Deflection Amplifier provides the voltages and controls for producing
the video display.
3.2.10.1 Type 796545-1 High Voltage Power Supply/Deflection Amplifier (A2Al)
Refer to Figure 6-18 for the High Voltage Power Supply/Deflection Amplifier
schematic diagram. The reference designation for the High Voltage Power Supply/Deflection
Amplifier assembly is A2Al. Refer to Figure 3-16 for the High Voltage Power Supply block
diagram.
This assembly produces the voltages necessary to provide a display on the CRT.
Voltages for the CRT are produced by the 2 kV circuit (composed of U4, Ql, Q2, Tl, and CR3­
CR6). The -15 Vdc is inductively coupled via Ll to pulse width modulator U4 and to the source of
HEXFETs Ql and Q2. U4 is used to generate non-overlapping in-phase and out-of-phase
squarewaves to drive FETs Ql and Q2. The squarewaves are used to control the conduction of
the FETs.
U5B, Q3, Q4, and theirassoci;1ted components form a linear regulator. The
regulator compares a -5 Vdc sample from the -2 kV output with the -5 Vdc reference. The -5 Vdc
reference is applied through R7to the inverting input of U5B. The high voltage reference
sample taken from the tap of R20 (approximately -5 Vdc) is applied to the noninverting input of
U5B. U5B compares the two input voltages and produces an output correction voltage. This
voltage is coupled via R8 to the base of transistor Q3. The collector output of Q3 is applied
directly to the base of Q4.
The output voltage from U5B drives Q3, which in turn drives Q4. The output of Q4
varies the voltage at pin 5 of the primary of transformer Tl. It is this voltage that regulates the
-2 kV.
The same high voltage sample applied to U5B is also applied to U3A and U3B.
Buffered -5 Vdc from U3B is applied across R79 to U3A. U3A inverts the high voltage sample to
a +5 Vdc. This voltage is used for the HV SAMPLE used during BITE testing.
3-23

CIRCUIT DESCRIPTION
WJ-9205
MODULATION
CONTROL
U4
T1
1----,.
~.... ---

WJ-9205
CIRCUIT DESCRIPTION
The 500 V at pin 1 of the secondary of Tl is quadrupled (x4) via diodes CR3-CR6
and capacitors C15 and C16. The resultant '-2,000 Vdc is resistively coupled via Rll out E3 to
the GRID of the CRT. The same voltage applied to E3 is reduced through voltage dividers to
provide the high voltage sample (RI2-R21), the CATHODE voltage, and ACCELERATION voltage
(R22-R30) at E4 and E5 respectively. Diodes CR1 and CR2 fullwave rectify the voltage across
E14 and E16, producing the 6.3 Vdc FILAMENT voltage. Diode CR7 halfwave rectifies the
voltage at E2 producing +220 Vdc for biasing the deflection driver circuits.
Depending on the switch setting of U7, an external XY source is used or, signals
from the DRD module (A1A3) are used to produce the X and Y deflections for the CRT. The
selected X or Y source from connector PI is directed through the closed switch contacts of U7 to
amplifier U8. The logic level at connector PI pin 14 determines whether the external or internal
XY source is selected. The X signal is amplified by U8A and resistively coupled to U9A and U6A.
From U9A the signal is applied to the base of transistor Q5. The output of U6A is applied to the
rear panel X OUTPUT. The Y signal fromU8B is resistively coupled to U9B and U6B. The
amplified signal from U9B is applied to the base of Q8. From U6B, the signal is applied to the
rear panel Y OUTPUT.
X and Y signals from U9A and U9B, respectively, are applied to differential
amplifiers Q5 and Q6 (for the X signal) andQ8 and Q9 (for the Y signal). Along with constant
current amplifiers Q7 and QI0, the differential amplifiers provide approximately +120V output
for the horizontal deflectors and the vertical deflectors for the CRT.
3.2.11 TYPE 196171-1 LOW VOLTAGE POWER SUPPLY (A3)
Refer to Figure 6-19 for the Low Voltage Power Supply schematic diagram. The
reference designation for the DC Power Supply is A3. Refer to Figure 3-17 for the DC Power
Supply block diagram.
The Low Voltage Power Supply is composed of a full-wave bridge rectifier (U1), a
half-wave rectifier (CR1, CR2) and four voltage regulators (U2-U5) and supplies +15V, -15V, +8V,
and +5V operating voltages to poth the analog and digital circuits of the Signal Monitor.
Input AC power (50-400 Hz) is applied through line filter Fll, POWER switch SI,
Voltage Selector Switch S2, and power transformer T1. Switch S2 is set to either 115 Vac or
230 Vac position depending on the line voltage to be used and adapts the connects to the primary
of the step-down power transformerTl.
One of the two secondary windings of transformer T1 supplies the ac voltage to the
full-wave bridge rectifier U1. Both negative and positive rectified output voltages are provided
by Ul. The positive voltage is filtered by capacitor C8 and input to the +15 volt regulator U2.
The regulated +15 voltage is routed to the signal monitor circuits through inductor Ll from pin 5
of power supply connector Pl.
The negative output from bridge rectifier U2 is filtered by capacitor C9 and input
to the -15 volt regulator U3. The regulated -15 voltage is routed to the signal monitor circuits
through inductorL2 from pin 1 of power supply connector PI.

CIRCUIT DESCRIPTION
WJ'-9205
I
REGULATOR
U2
+ 15V
ACINPUT
BRIDGE
---".. RECTIFIER
Ul
I ~
REGULATOR
~
~
U3
~
~15 V
ACINPUT
HALF
WAVE
RECTIFIER
CR1, CR2
REGULATOR
U4
+5V
REGULATOR
U5
+8V
Figure 3-17. Switching Power Supply Block Diagram
The other secondary winding of transformer TI supplies the ac voltage to the halfwave
rectifiers CRI and CR2. The positive voltage from the rectifier is filtered by capacitors
CIO and CHand applied to voltage regulators U4 and U5. The regulated +5 volt output from
regulator U4 is routed through inductor L3 and is available at pin 3 of connectorPl.
The regulated +8 volt output from regulator U5 is routed through inductor L4 and is
available at pin 4 of connector P1.
3-26

SECTION IV
MAINTENANCE

WJ-9205
MAINTENANCE
SECTION iv
MAINTENANCE
4.1 GENERAL
The WJ-9205 Signal Monitor has been designed to operate for extended periods of
time with a minimum of routine maintenance. Cleaning, inspection and performance tests should
be performed at regular intervals, consistent with the facility's normal maintenance scheduling
and after repairs have been completed.
4.2 CLEANING AND LUBRICATION
The unit should be kept free of dust, moisture, grease, and other foreign material to
ensure trouble-free operation. Low pressure air can be used, if available, to remove accumulated
dust from the interior of the unit. A clean, dry cloth or soft bristled brush may also be used to
remove the accumulation of dust. No lubrIcation of this unit is required•.
4.3 INSPECTION FOR DAMAGE OR WEAR
Many existing or potential troubles can be detected by making a thorough visual
inspection of the unit. For this reason, as a first step, a complete visual inspection should be
made whenever the unit is inoperative. First, inspect mechanical parts, such as pin connectors
and interconnecting cables for looseness, wear, and signs of deterioration.·· Inspect plug-in
modules and subassemblies to ensure that they are properly installed, in their appropriate
connector slot, and making good electrical contact. Finally, electrical componentS that show
visible signs of deterioration, such as overheating, discoloration, or "sweating" should be carefUlly
checked for proper operation. In addition, a thorough inspection Of the associated circuitry
should be made to verify proper operation. Often times, damage due to overheating is the result
of otber, less apparent problems in the circuit.
4.4 TEST EQUIPMENT REQUIRED
The test equipment listed in Table 4-1, or equivalent equipment is required to
perform the following troubleshooting procedures, performance tests, and alignment procedures.
Table 4-1. Test Equipment Required
Equipment Description Type
Autotransformer Variable W5MT3W General Radio
Digital Voltmeter High Impedance 8050A Fluke
Signal Generator 20 Hz-I024 MHz 8640B Hewlett-Packard
Spectrum Analyzer 100 Hz-I.5 .GHz 8568B Hewlett-Packard
Oscilloscope 100 MHz Dual Trace 465BTektronix
AC Power Source 45 Hz-I0 kHz 400V Elgar
Volt/Power Meter Volt/Ammeter 501A Elgar
Signal Monitor 21.4 MHz IF Out WJ-9205
Computer Controller 82937A IEEE-488 85 Hewlett-Packard
Test Tape Remote Control Tape RCS-30026 WJ
4-1

MAINTENANCE
WJ-9205
4.5 TROUBLESHOOTING AND :FAULT ISOLATION PROCEDURES
Troubleshooting of this unit can be performed by placing the unit in its normal
operating mode and observing its operation during various operating conditions. To eliminate the
possibility of external conditions causing the suspected problem, use the equipment listed in
Table 4-1 to inject the required signal and monitor the result.
The following performance tests, and the Troubleshooting Table (Table 4-2) are
provided as an aid for localizing the cause of a malfunction to a particular subassembly or module
within the unit. Refer to the block diagrams (in Section m) and the schematic diagrams (in
Section VI) to aid in the troubleshooting.
NOTE
To prevent possible damage to the unit circuitry,
turn power off before removing or installing any
subassembly or module•.
Table 4-2. WJ-9205 Troubleshooting Table
Symptom
Unit totally inoperative.
No display
or output.
Display dim
No display on CRT
Only a dot
displayed on CRT
Probable Cause
Fuse :Fl blown
Defective p,ower switch
Failed Low Voltage
Power Supply (A3)
Defective I/O module
(AlA4)
Set for 230 Vac operation
with 115/Vac
applied to the unit
Faulty Sweep module
(AlAS)
Defective High Voltage
Power Supply (A2)
Faulty CRT
All three Inputs are OFF
x-Y Mode selected
Corrective Action
Locate and correct cause of
blown fuse. Replace blown
fuse.
Verify proper operation of
switch S1. Replace if
defective.
Refer to paragraph 4.6.1~
Refer to paragraph 4.6.6.
Set voltage select switch (S2)
for proper line voltage.
Verify proper operation·of
A2Al.
Verify proper operation A2.
Verify proper CRT operation.
Select the desired input.
Connect external monitor.
Select a receiver input.
4-2

WJ-9205
MAINTENANCE
Table 4-2. WJ-9205 Troubleshooting Table (Continued)
Symptom Probable Cause Corrective Action
Signal amplitude Faulty LOG/IF Det Verify proper LOG/IF operation.
is nonlinear (AlAlO) Refer to paragraph 4.6.1.
Unable to select Defective Input Con- Refer to paragraph 4.6.6.
different inputs trol (AlA7)
Attenuation inop- Defective Input Con- Refer to paragraph 4.6.8.
erative
trol (AlA7)
Extra decimal Failed Bite Determine which test failed
points on display .
by pressing SHIFT key and
then the 2 key, observe
front panel display.
Front panel push- Defective keypad or Verify operation of keyboard.
.buttons inoperative faulty Keyboard Display Refer to paragraph 4.6.4•
module (A4)
In Remote Control mode
Verify front panel LED
labeled REM is extinguished.
Lights but does Faulty Data in Memory Turn power on again and
not respond
press the B key during the
(latched up)
power up sequence.
4.6
PERFORMANCE TESTS
The following performance test procedures may be used for periodic performance
testing, as an aid in troubleshooting, or as a unit performance test after repairs have been
completed. These procedures should be performed only by skilled technicians familiar with the
unit and with the tests being performed.
4.6.1 LOW VOLTAGE POWER SUPPLY PERFORMANCE TEST
1. Prior to connecting power to the signal monitor, ensure switch S2
is set to the 115 Vac position.
2. Connect the test equipment as illustrated in Figure 4-1 and set
the auto transformer to the minimum output voltage position.
3. Turn the signal monitor power switch to the on position and
slowly increase the voltage on the auto transformer toward
115 Vac. Ensure the power consumption does not exceed 45 watts
at 115 Vac (less than 500 rnA).
4-3

MAINTENANCE
WJ-9205
4. With a line voltage setting of 115 Vac on the auto transformer,
measure the Low Voltage Power Supply voltages with the digital
voltmeter. Refer to Table 4-3 for the test point, the voltage, and
the specified tolerance.
AUTO
.--
TRANSFORMER
FL1Jl
WJ-9205
DIGITAL
I VOLTMETER
A3
I
I
Figure 4-1. Power Supply Performance Test, Equipment Connections
Table 4-3. Low Voltage Power Supply Voltages
Test Point Supply Voltage (Tolerance)
A3E5 +15 Vdc +15 (±0.1 Vdc)
A3E1 -15 Vdc -15.4 (±1.0 Vdc)
A3E4 +8 Vdc +8.1 (±0.3 Vdc)
A3E3 +5 Vdc +5.0 (±0.25 Vdc)
5. Slowly decrease the auto transformer output voltage until the
front panel display fails to operate properly. (A span of .5M
begins to break up and become unstable.) Verify the auto
transformer output voltage is less than or equal to 103.5 Vac.
Various BITE error messages are visible on the front panel
display.
6. Disconnect the test equipment.
4.6.2 HIGH VOLTAGE POWER SUPPLY/DEFLECTION AMP PERFORMANCE TEST
1. Verify the presence of a sweep trace on the CRT. The displayed
trace on the CRT indicates that the High voltage power supply is
functioning.
4-4

WJ-9205
MAINTENANCE
2.
Rotate the front panel INTENSITY control knob and verify that
at minimum intensity (max CCW) the trace is not visible and at
the maximum intensity (max CW) the trace is of adequate
intensity and does not expand or lose its focus.
4.6.3 MICROPROCESSOR PERFORMANCE TEST
monitor.
Microprocessor operation is indicated by the proper functioning of the signal
4.6.4 KEYBOARD AND DISPLAY PERFO~MANCE TEST
1. Apply 115 Vac line voltage to the signal monitor FLIJI and turn
the signal monitor on.
2. Observe the front panel Alphanumeric display.
a.Verify that all segments of each LED is illuminated and are
approximately the same brightness.
b. Verify the front panel display temporarily indicates the unit
type and software version as: WJ 9205 - X.X.X
c. Press each of the keys on the front panel to verify the
mechanical and electrical operation of the key and its
associated function, as listed in Table 4-4.
Table 4-4. Pushbutton Performance Verification
Function Range Sequence
TRACE 1-3 1, 2, 3
INPUT OFF-XY OFF, RX1, RX2, RX3, M-Z,
X-Y
SPAN 000-5M 000, 50k, .IM, .2M, .5M,
I.M, 2.M, 5.M
RBW 10 KHz 10 KHz, OPTION NOT INST
(if option is not installed)
ATTEN 0-70 0, 10, 20, 30, 40, 50, 60, 70
d. Set the signal monitor operating parameters as follows:
TRACE 1
INPUT M-Z
TRACE 2 OFF
TRACE 3 OFF
4-5

MAINTENANCE
WJ-9205
e.
f.
g.
h.
Press the SHIFT key and then the 1 key. Observe that the
calibration ramp is displayed on the CRT. Observe that the
ramps are relatively linear, continuous, and without gaps in
the trace.
Press the INPUT key until 1 is displayed on the display.
Press the STORE key.
Press the INPUT key until M-l is displayed on the front
panel. Verify that the test ramp is not stored in memory.
Set tohe trace parameters as follows:
TRACE 1
INPUT RXI
SPAN .IM
ATTEN 10
TRACE 2
INPUT RX2
SPAN .5M
ATTEN 30
TRACE 3
INPUT RX3
SPAN 2M
ATTEN 50
i. Press the SHIFT key and the PRESET key to store the set
parameters in memory.
j. Select each of the three traces again and set them all to
OFF.
k. Press the PRESET key and verify that the parameters set in
Step h are displayed for each TRACE.
4.6.5 SWEEP WIDTH AND CENTERING PERFORMANCE TEST
1. Connect the test equipment as illustrated in Figure 4-2. Set the
signal generator for a 21.4 MHz, -90 dBm, CW output.
2. Set the signal generator as follows:
TRACE
INPUT
SPAN
ATTEN
1 (TRACE 2 and 3 OFF)
RXI
50K
o
3. Observe the displayed trace on the CRT. Verify that it is symmetrical
and centered on the SM display.
4-6

WJ-9205
MAINTENANCE
4.
5.
6.
Tune the signal generator frequency until the displayed response
is centered over the lowest frequency graduation on the display
graticule. Note the signal generator frequency.
Tune the signal generator frequency until the displayed response
is centered over the highest frequency graduation on the display
graticule. Note the frequency of the signal generator.
Repeat Steps 4 and 5 for each signal monitor SPAN. Refer to
Table 4-5 for the SPAN and the associated sweep width. The
tolerance for each SPAN is 10% of the selected SPAN.
Table 4-5. SPAN and Sweep Width
SPAN Low Frequency High Frequency Tolerance
.05M 21.375 MHz 21.425 MHz ±10%
.1M 21.350 MHz 21.430 MHz ±10%
.2M 21.300 MHz 21.500 MHz ±10%
.5M 21.150 MHz 21.600 MlIz ±10%
1.M 20.900 MHz 21.900 MHz ±10%
2.M 20.400 MHz 22.400 MHz ±10%
5.M 18.900 MHz 23.900 MHz ±10%
4.6.6 INPUT/OUTPUT CONTROL PERFORMANCE TEST
1. Connect the equipment as illustrated by the solid line in
Figure 4-2. Set the signal generator for a 21.4 MHz, -40 dBm,
CW output signal.
SIGNAL
------,
AlA? I
GENERATOR
---------------- I
J2 I
------------"----
13 I
•
Jl
WJ-9205
Figure 4-2. Input/Output Performance Test, Equipment Connections
4-7

MAINTENANCE
WJ-9205
2. Select TRACE 1 and INPUT 1 on the signal monitor and observe
the level displayed on the CRT.
3. Move the signal generator output to A 7J2 and select
approximately the same level as observed in Step 2.
4. Move the signal generator output to A7J3 and select INPUT 3.
Verify that the observedlevel is approximately the same level as
observed for Steps 2 and 3. .
5. Reconnect the signal generator output to A7J1. Select INPUTs 2
and 3 while observing the displayed trace. Verify that feedthrough
from INPUT 1 is visible on the other displayed traces.
4.6.7 LOG/IF DETECTOR PERFORMANCE TEST
1. Set the signal monitor controls as follows:
TRACE 1
INPUT 1
SPAN 5.M
ATTEN 0
2. Connect the equipment as illustrated by the solid lines in
Figure 4-3. Set the oscilloscope inputs for 0.1 volts/division and
for X-Y operation.
3. Set the signal generator output to 21.4 MHz and adjust the output
level until the peak of the displayed signal is at the top graduation
on the CRT display. Note the signal generator output level.
SIGNAL
--------- -.()
f-----,
WJ-920S
A1A7
GENERATOR J1 I
I
J2
I
OSCILLOSCOPE
J1
PINl (X)
CHl (X)
-------- -- I PIN3 (Y) CH2 (Y)
13
•
Figure 4-3. LOG/IF Detector Performance Test, Equipment Connections
4-8

WJ-9205
MAINTENANCE
4.
5.
6.
7.
8.
Tune the signal generator from 18.9 MHz to 23.9 MHz while
observing the oscilloscope position of the highest and lowest
variations.
Retune the signal generator to the position of the greatest peak
deviation, then tune the signal generator to the position of the
greatest negative deviation.
Adjust the signal generator output level to move the mInImum
deviation to the same level as the greatest peak deviation. The
difference between the two levels should not exceed 2 dB.
Disconnect the oscilloscope X-Y connection from J1 of the signal
monitor.
Reset the signal monitor SPAN to 2.M. Set the signal generator
output level to produce a response at the top graduation on the
CRT. The level should be -27 dBm (±2 dB). The following list
indicates the signal generator output level and the graduation
mark. Reduce the signal generator output until the display is at
the next lower graduation mark.
Graduation
Top
2nd
3rd
4th
5th
6th
7th
8th
Output Level (+2 dB)
-27 dBm
-37 dBm
-47 dBm
-57 dBm
-67 dBm
-77 dBm
-87 dBm
-97 dBm
9. Reduce the signal generator output level until the display on the
CRT is barely visible (minimum amplitude). Verify the signal
generator output is at least -100 dBm.
4.6.8 INPUT ATTENUATOR PERFORMANCE TEST
1. Connect the test equipment as illustrated in Figure 4-2. Set the
signal generator for 21.4 MHz, CW, with an output level to
produce a signal on the CRT at the top graduation with 0 dB
attenuation.
2. Use the ATTEN increment key to select 10 dB of attenuation.
Verify the display on the CRT has decreased approximately one .
graduation mark.
3. Repeatedly increase the amount of signal monitor attenuation,
while observing the CRT display. For each 10 dB increase in
attenuation, the display amplitude should drop approximately one
graduation.
4-9

MAINTENANCE
WJ.;..9205
4.6.9 SECOND IF/2 kHz RBW (AlA9) PERFORMANCE TEST (OPTIONAL)
1. Connect the test equipment as shown in Figure 4-8.
2. Set the signal monitor to the parameters listed in Table 4-6.
3. Set the signal generator to provide a-50 dBm, CW signal at
21.4 MHz. .
4. Select the optional resolution bandwidth from the signal monitor
front panel.
5. Verify that the IF filter response has narrowed to 2 kHz and that
the level is within 1 dBm ofthat for the 10 kHz RBW.
6. Tune the signal generator down in frequency and verify that the
signal level drops -3 dB.
7. Tune the signal generator up in frequency and verify that the
signal level drops-3 dB.
4.6.10
REMOTE INTERFACE (AlA5) PERFORMANCE TEST (OPTIONAL)
NOTE
The test tape program used for this test
addresses the Signal Monitor at lEEE-488 remote
address of 26. Refer to Sectioil2 and set the
address to 26.
1. Connect the cable from the HP-85 computer controller to the
remote interface connector J5 on the rear panel of the Signal
monitor.
2. Load the file "9205SM" from the test tape RCS-30026. On the
HP-85,press RUN.
3. Follow the prompts displayed on the computer controller CRT,
and verify that the Signal Monitor operates accordingly.
4-10

WJ-9205
MAINTENANCE
4.7 ALIGNMENT PROCEDURES
. The following alignment procedures should be performed only after the signal
monitor failed a performance test or after a module has been repaired or replaced.
WARNING
Exercise extreme care when aligning this unit
with the protective covers removed. Potentially
lethal voltages are used in this unit.
4.7.1 MICROPROCESSOR (AlAI) ALIGNMENT
1. Locate adjustment R7 and rotate fully counterclockwise (CCW).
2. Observe the signal monitor CRT display and verify that it is
blanked.
3. Slowly rotate R7 clockwise (CW) until the signal monitor resumes
normal operation, indicated by an audible tone and the power-up
display sequence being performed.
4. Rotate R7 one-eighth (l/8) of a turn in the same direction (CW).
4.7.2 DRD/TIMING CONTROLLER (AIA3) ALIGNMENT
1. Set the WJ-9205 Signal Monitor to the parameters listed in
Table 4-6.
Table 4-6. WJ-9205 Signal Monitor Alignment Settings
Parameter
Setting
TRACE
1 (Selected)
2 and 3 OFF
INPUT
RX1
SPAN
50K
RBW
10K
ATTEN 0
2. Connect the test equipment as illustrated in Figure 4-4 and place
the A1A3 assembly on its extender board.
3. Set the signal generator to 21.4 MHz with a-50 dBm CW output
level.
4-11

MAINTENANCE
WJ-9205
4. Set the oscilloscope vertical input for DC coupling and a
sensitivity of 1 VOLT/DIV. .
5. Adjust R7 for a centered, symmetrical sweep as displayed on the
CRT.
NOTE
To properly align the DRD/Timing Control
assembly, the High Voltage Power Supply/
Deflection Amplifier (A2A1) must first be
properly aligned.
SIGNAL
GENERATOR
WJ-9205
--...,
A1A7 I
J1
I
I
r---,
OSCILLOSCOPE.
I A1A3 I
I '---H- .--+- CH 1 (X)
L R27 .J.
Figure 4-4. DRD/Timing Control Alignment, Equipment Connections
4.7.3 mGH VOLTAGE POWER SUPPLY (A2) ALIGNMENT
CAUTION
Due to potentially lethal voltages contained on
this assembly, extreme caution is necessary
when aligning this assembly. Use only the
insulated alignment tool when aligning this
assembly.
1. Set the signal monitor to the parameters listed in Table 4-6.
Refer to Figure 4-5 for a typical t~st waveform display.
2. Press the SHIFT/l pushbutton combination to display the
sawtooth test pattern on the CRT.
3. Set the INPUT to M-Z and press the STORE pushbutton to store
the test pattern in memory.
4. Adjust R25 and R50 for a clear, sharp waveform trace on the
CRT display.
4-12

WJ-9205
MAINTENANCE
Figure 4-5. Typical Test Waveform
5. Adjust R45 to center the sawtooth transition (between· the 2nd
and 3rd ramp) at the center of the CRT display (on the vertical
graticule).
6. Adjust R43 to produce a slight overscan at either end of the CRT
trace. When properly adjusted, the first sawtooth ramp begins
slightly to the left of the first horizontalgraticule marker and
the end of the last ramp extends slightly to the right of the last
horizontal graticule marker.
7. Adjust R74 until the start of the sawtooth ramps is at the
baseline (the horizontal graticule line).
8. Adjust R64 until the top of the second sawtooth ramp is at the
very top·of the vertical graticule.
9. Adjust R70 and R80 to rotate the CRT vertical and horizontal
axes for a level and square test pattern display. When properly
adjusted, all of the ramp waveforms· begin at the horizontal
graticule line and are centered on the CRT display. .
NOTE
The high voltage adjustment (R20) is a factory
adjustment and is set correctly during alignment.
4-13

MAINTENANCE
WJ-9205
Alignment steps 10 to 13 are performed when an external monitor (WJ-9205,
WJ-9206 or a similar unit) is connected to rear panel connector J1.
10. Connect the test equipment as shown in Figure 4-6.
11. Set the signal generator to provide a 21.4 MHz CW output at a
-50 dBm level (or as required to provide an external trace).
12. Set the WJ-9205 Signal Monitor to the parameters listed in
Table 4-6, except select the X-Y INPUT.
13. Adjust R37, R39, R56, and R61 to provide the correct image size
and shape. Refer to the external monitor to determine the signal
shape.
WJ-9205
rAiAi'
I
I
J1
EXTERNAL
MONITOR
SIGNAL
GENERATOR
Figure 4-6. X- Y Alignment, Equipment Connections
4.7.4 FREQUENCY CONVERTER (A1A8) ALIGNMENT
1. Set the signal monitor to the parameters listed in Table 4-6,
remove the assembly covers, and t>lace the AlA8 assembly on the
proper extender board.
2. Connect the test equipment as illustrated in Figure 4-1.
3. Set the signal generator to provide a-50 dBm CW signal at
21.4 MHz.
4. Observe the signal displayed on the CRT while adjusting C19,
C20, and C21 to produce the maximum signal amplitude with the
best symmetrical shape.
4-14

WJ-9205
MAINTENANCE
WJ-n05
~-- AlA?
I
I Jl
SIGNAL
GENERATOR
Figure 4-7. Converter/LOG Detector Alignment, Equipment Connections
4.7.4.1
Second LO/Second Converter (AIA8A2) Alignment
1. Connect the test equipment as shown in Figure 4-7.
2. Remove the covers from the A1A8 assembly and place the
assembly on the extender board for alignment.
3. . While observing the CRT display, rotate Ll through its tuning
. range. Note the inductor tuning position range when the CRT
display is not blanked.
4. Set Ll to the midpoint of the adjustment range that produces a
display on the CRT.
4.7.4.2
Second IF/RBW (AIA8A3) Alignment
1. Connect the test equipment as shown in Figure 4-7.
2. Remove the covers from the AlA8 module and place the module
on its extender board.
3. Set the signal monitor to the parameters listed in Table 4-6.
4. Set the signal generator to provide a-50 dBm, CW signal at
21.4 MHz.
5. Adjust L3, L4, L7, and L8 for a smooth filter waveform response.
Note: the waveform may not necessarily be centered on the
signal monitor display.
4-15

MAINTENANCE
WJ-9205
4.7.4.3 First La/First Converter/Auto Centering (AIA8Al)
1. Connect the test equipment as illustrated in Figure 4-7, extend
the AlA8 assembly, and remove the assembly covers.
2. Set the signal generator to provide a 21.4 MHz CW signal at a
-50 dBm output level.
3. Set the signal monitor to the parameters listed in Table 4-6.
4. Adjust C12 to center the signal on the CRT display (at the
vertical graticule).
5. Connect an oscilloscope probe to pin 5 of U12 (A1A8A1) and
adjust C13 for a 0 Vdc indication on the oscilloscope.
6. Set the signal monitor for a SPAN of 5 MHz.
7. Set the signal generator to provide an 18.9 MHz -80 dBm CW
signal.
8. Set the signal monitor to the parameters listed in Table 4-6,
except select the 5M SPAN.
9. Adjust R44 to align the signal response with the last horizontal
graticule marker. (The signal may be on the left or the right,
depending on the jumperwire selection on DRD/Timing Controller
A1A3.)
10. Tune the signal generator to 23.9 MHz.
11. Observe that the signal is at the opposite end of the displayed
trace.
12. Adjust R44 to reduce the difference between the marker position
and the last graticule marker by olle-half.
13. Repeat steps 7 through 12 until the interaction between the
signal position and the end markers is minimum, producing a
calibrated 5 MHz display.
4.7.5 LOG IF AMP/DETECTOR (AIAIO) ALIGNMENT
1. With no equipment connected to the signal monitor, set the signal
monitor to the parameters listed in Table 4-6.
2. Adjust R34 until noise starts to become visible on the horizontal
trace.
3. Connect the test equipment as illustrated in Figure 4-7.
4-16

WJ-9205
MAINTENANCE
4. Set the signal generator to produce a -27 dBm, 21.4 MHz, CW
signal.
5. AdjustR30 to set the signal peak at the top vertical marker.
6~ Set the signal generator output level to -97 dBm.
7. Adjust L6 and L8 to produce the greatest signal amplitude.
8. Adjust R2 until the signal peak is at the eighth (bottom) vertical
graticule marker.
9. Set the signal generator output level at -27 dBm and readjust R30
to set the signal peak at the top marker again.
10. Repeat steps 4 through 9 until the signal amplitude varies from
the top marker (for a -27 dBm input) to the bottom marker (for a
-97 dBm input).
4-17

SECTION V
REPLACEMENT PARTS LIST

REPLACEMENT PARTS LIST
WJ-9205
SIGNAL MONITOR
WJ-920S 5," XI
, _
51
Figure 5-1. WJ-9205 Signal Monitor, Front View
J2 J3 J4 JI
J5
(OPT.)
Figure 5-2. WJ-9205 Signal Monitor, Rear View
5-0

WJ-9205
REPLACEMENT PARTS LIST
SECTION V
REPLACEMENT PARTS LIST
5.1
UNIT NUMBERING METHOD
The method of numbering used throughout the unit is assigning reference designations
(electrical symbol numbers) to identify: assemblies, subassemblies, modules within a
subassembly, and discrete components. An example of the unit numbering method used is as
follows:
Subassembly Designation Al
Identify from I'ight to left as:
Rl Class and No. of Item
First (1) resistor (R) of
first (1) subassembly (A)
On the main chassis schematic, components which are an integral part of the main
chassis have no subassembly designations.
5.2 REFERENCE DESIGNATION PREFIX
The use of partial reference designations are used on the equipment and on the
manual illustrations. This partial reference designation consists of the component type letter(s)
and the identifying component number. The complete reference designation may be obtained by
placing the proper prefix before the partial reference designation. Reference designation
prefixes are included on the drawings and illustrations in the figure titles (in parenthesis).
5.3
LIST OF MANUFACTURERS
Mfr.
Code
Name and Address
Mfr.
Code
Name and Address
00681
00779
01121
01295
Catalyst Research Corp. 02114
1421 Clarkview Road
Baltimore, MD 21209
AMP Inc. 04597
P.O. Box 3608
Harrisburg, PA 17105
Allen-Bradley Company 04713
1201 South Second Street
Milwaukee, WI 53204
Texas Instruments, Inc. 05245
13500 North Central Expressway
Dallas, TX 75231
Amperex Electronics Corp.
5083 Rings Highway
Saugerties,NY 12477
Projects Unlimited Inc.
3680 Wyse Road
P.O. Box 14538
Dayton, OH 45414
Motorola, Inc.
5005 East McDowell Road
Phoenix, AZ 85008
Components Corporation
2857 North Halstead Street
Chicago, IL 60657
5-1

REPLACEMENT PARTS LIST
WJ-9205
Mfr.
Mfr.
Code Name and Address Code Name and Address
07263 Fairchild Semi-Conductor Corp. 19505 Applied Engineering Products
464 Ellis Street 1475 Whalley Ave.
Mt. View, CA 94040 New Haven, CT 06525
09021 Airco Electronics 22526 Berg Electronics, Inc.
Bradford, PA 16701 Route 83
New Cumberland, PA 17070
09353 C&K Components, Inc. 23936 Pamotor Division W.J. Prudy Co.
103 Morse Street 770 Airport Blvd.
Watertown, MA 02172 Burlington, CA 94010
11711 General Instrument Corp. 24355 Analog Devices, Inc.
Rectifier Division P.O. Box 280
Hicksville, NY 11802 Norwood, MA 02062
13103 Thermalloy Company 25088 Siemens America, Inc.
2021 W. Valley View Lane 186 Wood Avenue
Dallas, TX 75234 S. Iselin, NJ 08830
14632 Watkins-Johnson Company 25120 Piezo Technology, Inc.
700 Quince Orchard Road P.O. Box 7877
. Gaithersburg, MD 20878 2400 Diversified Way
Orlando,FL 32804
14752 Electro Cube Inc. 27014 National-Semi Conductor Corp.
1710 S. Del Mar Drive 2950 San Ysidro Way
San Gabriel, CA 91776 Santa Clara, CA 95051
15542 . Mini--Circuits Lab. 27264 Molex Inc.
2913 Quentin Road 2222 Wellington Court
Brooklyn, NY 11229 Lisle, IL 60532
15912 T/B Ansley Electronics 28480 Hewlett-Packard Company
4371 Valley Blvd. 1501 Page Mill Road
Los Angeles, CA 90065 Palo Alto, CA 94304
17856 Siliconix, Incorporated 29990 American Technical Ceramics
2201 Laurelwood Road Industries
Santa Clara, CA 95050
1 Norden Lane
Huntington Station, NY 11746
18324 Signetics Corporation 31745 Rogers Corporation
811 East Argues Avenue Williams Field and Dobson Road
Sunnyvale, CA 94086 P.O. Box 700
Chandler, AZ 85224
5-2

WJ-9205
REPLACEMENT PARTS LIST
Mfr.
Code
Name and Address
Mfr.
Code
Name and Address
33095
Spectrum Control Inc.
152 E. Main Street
Fairview, PA 16415
61892
NEC Electroncs USA Inc.
1 Natrick Executive Pk.
Natrick, MA 01760
4W715
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
62786
Hitachi America
1800 Bering Drive
San Jose, CA 95122
51642
Centre Engineering Inc.
2820 E. College Avenue
State College, PA 16801
7W259
Tel Cal Corporation
9108 Mayflower Avenue
El Paso, TX 79925
52648
Plessy Semi-Conductors
1641 Kaiser
Irvine, CA 92714
71279
Cambridge Thermionic Corp.
445 Concord Avenue
Cambridge, MA 02138
52673
KSW. Electronics Corp.
South BedfordStreet
Burlington, MA· 01803
71400
Bussman Division of McGraw
Edison Co.
P.O. Box 14460
St. Louis, MO 63178
54473
MatsuShita Elec. Gorp.
One Panasonic Way
P.O. Box 1501
Secaucus, NJ 07094
71785
TRW Electronics Components
1501 Morse Avenue
El Grove Village, IL 60007
55027
Q-Bit Corporation
311 Pacific Avenue
Palm Bay, FL 32905
73138
Beckman Instruments, Inc.
2500 Harbor Blvd.
Fullerton, CA 92634
56289
Spr,ague Electronic Company
Marshall Street
North Adams, MA 01248
75915
Littlefuse, Inc.
800 E Northwest Highway
Des Plaines, IL 60016
59660
Tusonix Inc.
2155 N. Forbes Blvd.
Suite 107
Tucson, AZ 85745
76493
Bell Industries, Inc.
P.O. Box 5825
19070 Reyes Avenue
Compton, CA 90024
5-3

REPLACEMENT PARTS LIST
WJ-9205
Mfr.
Mfr.
Code Name and Address Code Name and Address
8K838 Varo 81350 Joint Army-Navy Specifications
P.O. Box 469013
1000 N. Shilak
Garland, TX 75046-9013
80058 Joint Electronics 81483 International Rectifier Corp.
Type Designation Systems
9220 Sunset Blvd.
Los Angeles, CA 90054
80131 Electronics Industries Assoc. 82389 Switch Craft, Inc.
Washington, DC 20036
555 North Elston Avenue
Chicago, IL 60630
81073 Grayhill, Inc. 91293 Johanson Mfg. Company
561 Hill Grove Avenue P.O. Box 329
P.O. Box 10373 Boonton, NJ 07005
LaGrange,IL 60525
81349 Military Specifications 96906 Military Standards
99800 Delevan Electronics Division
270 Quaker Road
East Aurora, NY 14052
5.4 PARTS LIST
The following parts lists contain all the electrical components used in the unit,
along with mechanical parts which may be subject to unusual wear or damage. When ordering
replacement parts from the Watkins-Johnson Company, specify the unit type. and serial number.
Also include the reference designation and the description of each item ordered. The list of
manufacturers, provided in paragraph 5.3, and the manufacturer's part number, provided in
paragraph 5.5" are supplied as a guide to aid the user of the equiment while in the field. The
parts listed may not necessarily be identical with the parts installed in the unit. The parts listed
in paragraph 5.5 will provide for satisfactory unit opt:ration.
Replacement parts may be obtained from any manufacturer prOvided that the
physical characteristics and electrical parameters of the replacement item are compatible with
the original part. In the· case where components are defined by a military or industrial specification,
a vendor which can provide the necessary component is suggested as a convenience to
the user.
5-4

WJ-9205
REPLACEMENT PARTS LIST
NOTE
As improvements in semiconductors are made, it
is the policy of Watkins-Johnson to incorporate
them in proprietary products. As a result, some
transistors, diodes and integrated circuits which
are installed in the unit may not agree with the
parts lists or schematic diagrams of this manual.
However, substitution of the semiconductor
devices listed in this manual may be substituted
with satisfactory results.
A3J3
A3J2
A3
AIAIO
A3J I
MDb.._PI
CI
C2
'C3
AIA6 AlAI AIA2 AIA3 AIA4 AIA5
(OPT.)
P2
BI
AI
AIA7 AIA8 AIA9
(OPT.)
Figure 5-3. WJ-9205 Signal Monitor, Top View
5-5

REPLACEMENT PARTS LIST
WJ-9205
.
55
TYPE WJ-9205 SIGNAL MONITOR
MAIN CHASSIS
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionC
Al Motherboard Assembly 1 796533-1 14632
A2 High Voltage Power SupplylDeflect Amplifier 1 796782-1 14632
A3 Low Voltage PowerSupply Assembly 1 796771-1 14632
A4 Keyboard Display Assembly 1 796539-1 14632
AI-l Cord, AC Line 1 17600 16428
AI-8 Extender Board No.1 1 381200-1 14632
AI-9 Extender Board No.2 1 381200-2 14632
AI-I0 Extender Board No.3 1 381200-3 14632
AI-ll Extender Board No.4 1 381201-1 14632
AI-12 Extender Board No.5 1 381201-2 14632
Bl Blower Fan 1 814 23936
Cl Filter 3 4101-000 59660
C2 Same asCI
C3 Same asCI
Fl Fuse, 3/4 Amp, 8lo-Blow 1 MDL3/4 71400
FLl Filter, Power Line 1 lEFl 05245
FL2 Filter Box 1 281499-1 14632
Jl Connector, Filtered 1 842925-3 00779
J2 Connector, Plug 3 205206-1 00779
J3 SameasJ2
J4 SameasJ2
PI Connector, Plug 1 65043c025 22526
P2 Connector, Housing 1 09-50-7031 27264
P3 Connector, Housing 1 09-50-3091 27264
SI Switch, Pushbutton 1 8161-S-H-Z3-Q-E 09353
.82 Switch,8lid.e J 46256LFR 82389
Tl Transformer Power 1 841337 14632
XFl Fusehoider 1 342004 75915
5-6

WJ-9205
REPLACEMENT PARTS LIST
5.5.1 TYPE 796533-1 MOTHERBOARD ASSEMBLY
REF DESIG PREFIX Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionDl
Al Microprocessor Assembly 1 796534-1 14632
A2 Data Acquisition Assembly 1 796535-1 14632
A3 DRDfl'imingController Assembly 1 796536-1 14632
A4 Input/Output Assembly 1 796537-1 14632
A5 Remote Interface Assembly (Optional) 1 796538-1 14632
A6 Not Used
A7 Input Control 1 796561-1 14632
A8 Frequency Converter, Sweep 1 796562-1 14632
A9 Second IF Assembly (Optional) 1 796790-1 14632
AI0 Log IFlDetector Assembly 1 796577-1 14632
Cl Capacitor, Electrolytic, Tantalum: 2711F, 10%,35 V 2 CS13BF276K 81349
C2 Same asCI
C3 Capacitor, Electrolytic, Tantalum: 100 llF, 20%, 20 V 3 196D107X0020TE4 56289
C4 SameasC3
C5 SameasC3
Jl Header, Modified 1 281508-1 14632
J2 Connector, Modified 1 281388-3 14632
J3 Connector, Receptacle 1 87215-8 00779
J4 Connector, Modified 1 281388-1 14632
J5 Header Assembly 1 609-3427 15912
Rl Resistor, Fixed, Film: 680,5%,114 W 2 CF1I4-680HMSlJ 09021
R2 SameasRl
XAI Header Assembly 5 5189-18-84 00779
XA2
Thru Same as XAI
XA5
xA6 Not Used
XA7 Header Assembly 6 5189-18-82 00779
XA8
Thru SameasXA7
XAI0
XA2B Header Assembly 2 5189-18-81 00779
XA3B SameasXA2B
XA4B Header Assembly 1 5189-18-83 00779
XA8B SameasXA7
XA9B SameasXA7
5-7

REPLACEMENT PARTS LIST
WJ-9205
. . .
5 5 1 1 Tvoe 796534-1 Microprocessor Assemblv
REF DESIG PREFIX AlAI
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision Bl
BTl Battery 1 1935-DE 00681
C1 Capacitor, Ceramic, Disc: .1llF', 20%, 50 V 2 34475-1 14632
C2 Capacitor, Electrolytic, Tantalum: 22llF', 20%,10 V 1 196D226X001OJE3 56289
C3 Capacitor, Micro-Q, Dip: .03 pF, 50 V 3 1ROGUQ01A 31745
C4 Same asCI
C5 SameasC3
C6 Capacitor, Ceramic, Monolithic: 27 pF, ±2%,100 V 2 150-100-NPO-270G 51642
C7 SameasC6
C8
Thru Not Used
C10
Cll Capacitor, Micro-Q, Dip: .03llF', 50 V 2 lROGUQ08A 31745
C12 Capacitor, Micro-Q, Dip: .03llF',50 V 4 1ROGUQ04A 31745
C13
Thru SameasC12
C15
C16 Capacitor, Micro-Q, Dip: .03 pF, 50 V 1 lROGUQ02A 31745
C17 Capacitor, Ceramic, Disc: .01llF', 20%, 50 V 1 34453-1 14632
C18 Capacitor, Ceramic, Disc: 0.47llF',10%, 50 V 1 8131-050-X7RO-474K 59660
C19 SameasC11
C20 Capacitor, Electrolytic,Tantalum: 47 pF, 10%,20 V 1 CS13BE476K 81349
C21 SameasC3
C22 Capacitor, Ceramic, Monolithic: 470 pF, ±2%,100 V 1 150-100"NPO-471G 51642
CRI Diode I 1N748A 80131
CR2 Diode I IN4449 80131
CRa Diode I 5082-2800 28480
PI Receptacle Assembly 1 66527-036 22526
Q1 Transistor 2 2N4403 80131
Q2 Transistor 1 2N4401 80131
Q3 SameasQI
R1 Resistor, Fixed, Film: 47 kG, 5%,114 W 5 CF1I4·47K1J 09021
R2
Thru SameasRl
R5
R6 Resistor, Fixed, Film: 5.6 kG, 5%, 114 W 1 CF1I4-5.6K1J 09021
R7 Resistor, Trimmer, Film: I kO,IO%, 1/2 W 1 62PAR1K 73138
R8 Resistor, Fixed, Film: 1.0 kO, 5%,114 W I CF1I4-IKlJ 09021
R9 Resistor, Fixed, Film: 470 kO, 5%,114 W 1 CF1I4-470KlJ 09021
RIO Resistor, Fixed, Film: 10 kG, 5%,114 W I CF1I4-IOKlJ 09021
Rll Resistor, Fixed, Film: 22 kO, 5%, 114 W 2 CF1I4-22K1J 09021
R12 Resistor, Fixed, Film: 1.0 MO, 5%,114 W I CF1I4-IMlJ 09021
RI3 Same asRII
RI4 Resistor, Fixed, Film: 4700,5%,114 W 1 CF1I4-470 OHMSlJ 09021
5-8

WJ-9205
REPLACEMENT PARTS LIST
REF DESIG PREFIX AlAl
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOIl
R15 Resistor, Fixed, Film: 2.2 kn, 5%, 1/4 W 2 CF1/4-2.2K1J 09021
Rl6
SameasRl5
UI Programmed EPROM 1 841236 14632
U2
Not Used
U3 Resistor, Network: 100 kn,2%,l/8 W 3 LlO-IC104 73138
U4
Not Used
U5 Integrated Circuit, RAM 1 HM6264LP-12 62786
U6
SameasU3
U7 DIP Shunt 1 1-435704-0 00779
U8 Integrated Circuit 1 MC6809P 04713
U9
SameasU3
UIO Integrated Circuit 1 SN74ALS32N 01295
un Integrated Circuit 1 MM74HCl4N 27014
U12 Integrated Circuit 2 MM74HCOON 27014
U13 Integrated Circuit 1 MM74HCT245N 27014
U14 Integrated Circuit 3 MM74HCT244N 27014
U15
SameasU14
U16 Integrated Circuit, PROM 1 841279 14632
U17
U18
SameasU12
SameasU14
U19 Integrated Circuit 1 SN74LS221N 01295
YI Crystal, Quartz 1 CR6414 5.24 MHi: 80058
5-9

REPLACEMENT PARTS LIST
WJ-9205
. • .
5 5 1 2 TvPe 796535-1 Data ACQuisition Assemblv
REF DESIG PREFIX AIA2
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionDl
C1 Capacitor; Ceramic, Disc: .47 IlF, 20%, 50 V 11 34452-1 14632
C2
Tbru Same asCI
C4
C5 Capacitor, Electrolytic, Disc: .1 vF, 20%, 50 V 5 34475-1 14632
C6 SameasC5
C7 Capadtor, Ceramic, Monolitbic: 1000 pF, ±2%, 100 V 1 150-100-NPO-102G 51642
C8 Capacitor, Electrolytic,Tantalum: 100 IlF, 20%, 20 V 2 196D107X0020TE4 56289
C9 SameasC8
C10 Capacitor, Electrolytic, Tantalum: 221lF, 20%,10 V 2 196D226X0010JE3 56289
Cll Same asCI
C12 Capacitor, Electrolytic, Tantalum: 4.71lF, 20%, 35 V 4 196D475X0035JE3 56289
C13 SameasC12
C14 Same asCI
C15 SameasC5
C16 SameasC5
C17 Capacitor, Micro-Q, Dip: .031lF, 50 V 6 1ROGUQ04A 31745
C18 SameasC17
C19 SameasC17
C20 Same asCI
C21 Capacitor, Electrolytic, Tantalum: 181lF,10%, 20 V 3 196D186X9020KE3 56289
C22 Not Used
C23 SameasC17
C24 SameasC12
C25 Same asCI
C26 Capacitor, Ceramic, Monolitbic: 330 pF, ±2%, 100 V 1 150-100-NPO-331G 51642
C27 Same asCI
C28 Capacitor, Ceramic, Monolitbic: 22 pF, ±2%,100 V 1 100-100-NPO-220G 51642
C29 SameasC17
C30 Same asCI
C31 SameasC21
C32 SameilsC12
C33 Same asCI
C34 SameasC21
C35 SameasC5
C36 SameasC17
C37 Capacitor, Ceramic, Disc: 1000 pF,10%, 200 V 1 CK05BX102K 81349
C38 Capacitor, Ceramic, Disc: 3300 pF, 10%,200 V 1 CK06BX332K 81349
CRI Diode 1 1N4449 80131
PI Receptacle Assembly 1 66527-036 22526
P2 Receptacle Assembly 1 66527-006 22526
Rl Resistor, Fixed, Film: lOOn, 5%,114 W 9 CF1I4-100 OHMSlJ 09021
5-10

WJ-9205
REPLACEMENT PARTS LIST
REF DESIG PREFIX A1A2
bTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
R2
Thru
R5
SameasRI
R6 Resistor, Fixed, Film: 100,5%, 118 Vi 1 CF1I8-10 OHMSlJ 09021
R7 Resistor, Fixed, Film: 1.0 kO,1%,1110 W 6 RN55CI00IF 81349
R8
Thru SameasRI
RIO
Rll
R12
SameasR7
SameasRI
R13 Resistor, Fixed, Film: 60.4 kO, ± 1%,1110 W I RN55C6042F 81349
R14 Resistor, Fixed, Film: 20 kO,1%,1110 W I RN55C2002F 81349
RI5 Resistor, Fixed,Film: 10 kO,1%,1I10W 4 RN55CI002F 81349
RI6 Resistor, Fixed, Film: 6.04 kO,I%, 1110 W I RN55C6041F 81349
RI7 Resistor, Fixed, Film: 2.0 kO,1%,1110 W I RN55C200lF 81349
RI8
Thru SameasR7
R21
R22
Thni SameasRI5
R24
R25 Resistor, Fixed, Film: 39.2 kO,1%,1110 W 1 RN55C3922F 81349
R26 Resistor, Fixed, Film: 4700,5%,114 W 1 CFl/4-470 OHMSlJ 09021
R27 Resistor, Fixed, Film: 47kO, 5%, i/8 W 6 CFII8-47K1J 09021
R28
Thru SameasR27
R32
Ut Integrated Circuit 4 MM74HC374N 27014
U2 Integrated Circuit 1 MM74HC4040N 27014
U3 SameasUI
U4 Integrated Circuit 1 MM74HC4051N 27014
U5 Integrated Circuit 4 LM336Z-5.0 27014
U6 Integrated Circuit I DACI022LCN 27014
U7 SameasUI
U8 SameasUI
U9 Integrated Circuit I LlO07CN8 4W715
Uto Integrated Circuit 2 MC34002P 04713
Ull SameasU5
U12 Integrated Circuit I DG30lACJ 17856
Ut3 Integrated Circuit 2 MM74HC244N 27014
U14 Same as U13
U15 Integrated Circuit 1 MM74HC74N 27014
UI6 Integrated Circuit 1 ADC0820BCN 27014
UI7 SameasU5
Ut8 Integrated Circuit I DG302CJ 17856
5-11

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA2
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
U19
U20
SameasU5
SameasUI0
U21 Integrated Circuit 1 MM74HC151N 27014
5-12

WJ-9205
REPLACEMENT PARTS LIST
. . .
5 5 1 3 Tv1>e 796536-1 DRD/Timin~Controller Assemblv
REF DESIG PREFIX A1A3
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision D1
Cl Capacitor, Electrolytic, Tantalum: 4.711F, 20%, 35 V 5 196D475X0035JE3 56289
C2 Capacitor, Electrolytic, Tantalum: 111F, 20%, 35 V 2 1960105X0035HE3 56289
C3 Capacitor, Ceramic, Monolithic: 10000 pF, ± 2%, 100 V 1 300-100-NPO-I03G 51642
C4
C5
SameasC2
Same asCI
C6 Capacitor, Ceramic, Monolithic: 100 pF, ±2%,100 V 2 200-100-NPO-I01G 51642
C7 Capacitor, Ceramic, Monolithic: 1000 pF, ±2%, 100 V 2 150-100-NPO-102G 51642
C8 Capacitor, Ceramic, Monolithic: 470 pF, ± 2%, 100 V 1 150-100-NPO-471G 51642
C9
SameasC7
C10 Capacitor,Ceramic,Monolithic: .0111F, ±5%,100V 1 150-100-X7R-103J 51642
Cll Capacitor, Ceramic, Monolithic: 22pF, ± 2%,100 V 2 100-100-NPO-220G 51642
C12
C13
C14
Same as Cl1
SameasC6
Same asCI
C15 Capacitor, Ceramic, Tantalum: 100 pF, 20%, 20 V 2 1960107X0020TE4 56289
C16
SameasC15
C17 Capacitor, Micro-Q, Dip: .03 pF, 50 V 7 1ROGUQ04A 31745
C18
Thru SameasC17
C23
C24 Capacitor, Electrolytic, Tantalum: 18 pF,10%, 20 V 1 196D186X9020KE3 56289
CRI Diode 3 IN4449 80131
CR2
CR3
Same as CRI
SameasCRI
PI Receptacle Assembly 1 66527-036 22526
P2 Receptacle Assembly 1 66527-006 22526
Q1 Transistor 1 2N3904 80131
Q2 Transistor 1 2N3906 80131
Rl Resistor, Fixed, Film: 470Q, 5%, 114 W 4 CF1I4-470 QHMSlJ 09021
R2 Resistor, Fixed, Film: 1.0 kQ, 5%, 114 W 1 CF1I4-1K1J 09021
R3 Resistor, Fixed, Film: 10 kQ, 5%,1/4 W 4 CF1I4-10KlJ 09021
R4
Silme as R3
R5 Resistor, Fixed, Film: 4.75 kQ, 1%,.1110 W 1 RN55C4751F 81349
R6 Resistor, Fixed, Film: 10 kQ,l%,1/10 W 6 RN55CI002F 81349
R7 Resistor, Trimmer, Film: 50 kQ,10%,112 W 1 62PAR50K 73138
R8 Resistor, Fixed, Film: 130 kQ, 5%, 114 W 1 CF1/4-130KlJ 09021
R9 Resistor, Fixed, Film: 22.1 kQ,l%,1/10 W 1 RN55C2212F 81349
RIO
Thru SameasR6
R14
R15 Resistor, Fixed, Film: 1.3 kQ, 5%, 118 W 1 CF1I8-1.3K1J 09021
R16 Resistor, Fixed, Film: 4.7 kQ, 5%,114 W 2 CF1I4-4.7K1J 09021
R17 SameasRl
5-13

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA3
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
R18 Resistor, Fixed, Film: 2.2 kQ, 5%,1/4 W 3 CFl/4-2.2KJJ 09021
R19 SameasR18
R20 SameasRI
R21 SameasR3
R22 SameasR3
R23 SameasRI8
R24 SameasRI6
R25 ',Resistor, Fixed, Film: 27 kO, 5%,1/4 W I CFI/4-27KJJ 09021
R26 Resistor, Fixed, Film: 470,5%,1/4 W I CF1/4-470HMSlJ 09021
R27 SameasRI
R28 Resistor, Fixed, Film: 100,5%, 1/4 W 1 CF1/4-10 OHMSlJ 09021
UI Integrated Circuit 2 MM74HC4040N 27014
U2 Integrated Circuit 2 MM74HC244N 27014
U3 SameasU2
U4 Integrated Circuit 3 MM74HC74N 27014
U5 Integrated Circuit I MM74HCOON 27014
U6 Integrated Circuit 1 MM74HC251N 27014
U7 SameasUI
U8 Voltage Regulator 1 LM78L12CZ 27014
U9 Integrated Circuit 4 MM74HC374N 27014
UlO SameasU4
U11 Same as U9
Ul2 Integrated Circuit 2 MM74HC138N 27014
Ul3 Integrated Circuit 1 MM74HC08N 27014
Ul4 SameasU12
Ul5 SameasU9
U16 Integrated Circuit 1 DACI022I..CN 27014
Ul7 Integrated Circuit I MM74HC245N 27014
Ul8 Integrated Circuit, RAM 1 HM6264LP·12 62786
U19 Integrated Circuit 1 MM74HC32N 27014
U20 Same as U9
U21 Integrated Circuit 2 TL074CN 01295
U22 SameasU21
U23 Integrated Circuit 1 TL082ACP 01295
U24 Integrated Circuit I AD7528JN 24355
U25 Integrated Circuit I LM336Z-5.0 27014
U26 Not Used
U27 Same as U4
5-14

WJ-9205'
REPLACEMENT PARTS LIST
. . .
5 5 1 4 TvDe 796537-1 Input/OutDut Assemblv
REF DESIG PREFIX A1A4
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision BI
CI Capacitor, Ceramic, Disc: .01 lIF, 20%, 50 V I 34453-1 14632
C2 Capacitor, Electrolytic, Tantalum: 4.7IlF, 10%,35 V 4 CSI3BF475K 81349
C3 Capacitor, Micro-Q, Dip: .03 lIF, 50 V 11 lROGUQ04A 31'145
C4 SameasC2
C5 SameasC3
C6 SameasC2
C7 SameasC3
C8 Same as C2
C9
Thru SameasC3
C16
CRI Diode I 5082-2800 28480
CR2 Diode 1 IN4449 80131
LSI Alarm I AT-20K 04597
PI Receptacle Assembly I 66527-036 22526
P2 Receptacle Assembly I 66527-030 22526
RI Resistor, Fixed, Film: 10 kQ, 1%,1110 W 4 RN55CI002F 81349
R2 Resistor, Fixed, Film: 200 kQ, 1%,1110 W 2 RN55C2003F 81349
R3 SameasR2
R4 Resistor, Fixed, Film: 2.0 kQ, 1%,1110 W 4 RN55C200lF 81349
R5 Resistor, Fixed, Film: 100 kQ, 1%,1/10 W I RN55CI003F 81349
R6 SameasRI
R7 Resistor, Fixed, Film: 22.1 kQ, 1%,1110 W 1 RN55C2212F 81349
R8 SameasR4
R9 Same as R4
RIO SameasRl
Rll Same as R4
RI2 SameasRI
RI3 Resistor, Fixed, Film: 470Q, 5%,118 W 1 CF1I8-470 OHMSlJ 09021
U1 Integrated Circuit I LM336Z-5.0 27014
U2 Integrated Circuit I MCI458N 18324
U3 Integrated Circuit 1 MM74HC02N 27014
U4 Integrated Circuit 2 MM74HC08N 27014
U5 SameasU4
U6 Integrated Circuit 1 MM74HC4078N 27014
U7 Integrated Circuit 2 MM74HC74N 27014
U8 Integrated Circuit 4 MM74HCI38N 27014
U9 Same as U8
UIO Same as U8
Ull SameasU7
5-15

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AlA.
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
U12 Integrated Circuit 1 MM74HC4040N 27014
U13 Integrated Circuit 1 MM74HC245N 27014
U14 SameasU8
U15 Integrated Circuit 1 ADC0809CCN 27014
U16 Resistor, Network: 100 kD, 2%, 1/8 W 3 LlO-ICI04 73138
U17 Integrated Circuit. 3 MM74HC244N 27014
U18 Integrated Circuit 7 MM74HC374N 27014
U19 SameasU17
U20
Thru SameasU18
U22
U23 Same astJ16
U24
Thru SameasUI8
U26
U27 SameasU17
U28 SameasU16
5-16

WJ-9205
REPLACEMENT PARTS LIST
. . .
5 5 1 5 Tvoe 796538-1 Remote Interface Assemblv (OPtional)
REF DESIG PREFIX A1A5
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision Bl
Cl Capacitor, Electrolytic, Tantalum: 4.7 pF, 20%, 35 V 2 196D475X0035JE3 56289
C2 Capacitor, Electrolytic, Tantalum: 22 pF, 20%,10 V 1 196D226XOOI0JE3 56289
C3 Same asCI
C4 Capacitor, Ceramic, Disc: .1 pF, 20%, 50 V 11 34475·1 14632
C5 SameasC4
C6 SameasC4
C7 Capacitor, Electrolytic, Tantalum: 2.2 pF, 20%, 35 V 4 196D225X0035JE3 56289
C8 SameasC7
C9 Same as C4
CI0 Not Used
C11 Not Used
C12
Thru SameasC4
C18
C19 SameasC7
C20 SameasC7
CRI Diode 1 IN4449 80131
Jl Connector, Receptacle 1 86479-7 00779
J2 Not Used
PI Receptacle Assembly 1 66527-036 22526
Rl Resistor, Fixed, Film: 1.0 Mg, 5%,1/8 W 1 CF1/8-1M/J 09021
R2 Resistor, Fixed, Film: 47 kg, 5%, 1/8 W 2 CF1/8-47K1J 09021
R3 Same as R2
SI SwitchlDip 1 76PSB08S 81073
Ul Integrated Circuit 1 841137-1 14632
U2 Integrated Circuit 1 MM74HC04N 27014
U3 Integrated Circuit, GPIB 1 PD7210C 61892
U4 Integrated Circuit 1 841137-2 14632
U5 Resistor, Network: 100 kg, 2%,1/8 W 1 LI0-ICI04 73138
U6 Integrated Circuit, Buffer 1 MM74HCT244N 27014
U7 Not Used
U8 Integrated DC Drive 1 MM74HCT138N 27014
U9 Integrated Circuit 1 MM74HC32N 27014
UI0 Not Used
un
U12
U13
U14
U15
Yl
Not Used
Not Used
Not Used
Not Used
Not Used
Not Used
5-17

REPLACEMENT PARTS LIST
WJ-9205
. . .
5 5 1 6 Tvoe 796561-1 Inout Control Assemblv
REF DESIG PREFIX A1A7
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSV PARTNO. CODE VENDOR
Revision A
Al Input SeI~ctorlStepAttenuator Assembly 1 796500-1 14632
A2 Input Filter 21.4 MHz Marker 1 796544-1 14632
Cl Capacitor. Ceramic. Feedthru: 1000 pF. 500 V 11 54-794-009-102W 33095
C2
Thru SameasCl
Cll
Jl Connector. Receptacle 3 UGl094U 80058
J2 Same asJl
J3 Same asJl
PI Receptacle Assembly 1 66527-010 22526
P2 Connector. Plug 1 2005-1551-003 19505
5-18

WJ-9205
REPLACEMENT PARTS LIST
5.5.1.6.1 Type 796500-1 Input Selector/Step
Attenuator Assembly .
REF DESIG PREFIX AIA7Al
QTY
;
REF
PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionBI
Cl Capacitor,Cerllmic, Disc: .011lF, 20%, 50 V 38 34453-1 14632
C2
Thru SameasCI
C19
C20 Capacitor, Electrolytic,Tantalum: 4.7 pF, 20%, 35 V 1 196D475X0035JE3 56289
C21
Thi"u Same asCI
C39
CRI Diode, Pin 24 KS3542 52673
CR2
Thru Same as CRI
CR24
Ll Coil, Fixed: 18 pH, 10% 11 1025-50 (75084-15) 99800
L2
Thru SameasLI
L11
L12 Coil, Fixed, Molded: 4.7 IlH, 10% 2 1025-36 (75084·8) 99800
L13 Same as L12
Rl Resistor, Fixed, Film: 100,5%,114 W 6 CF1I4-10 OHMSlJ 09021
R2 SameasRI
R3 Resistor,Fixed,Film: 10kO,5%,1I4 W 7 CF1I4-10KlJ 09021
R4
Thru SameasR3
R6
R7 Resistor, Fixed, Film: 2.2 kO, 5%,114 W 1 CF1I4-2.2K1J 09021
RB Resistor, Fixed, Film: 470,5%,114 W 3 CF1I4-47 OHMS 09021
R9 Resistor, Fixed, Film: 2.7 kO, 5%,.l/4 W 16 CF1I4-2.7K1J 09021
RIO SameasR9
Rll SameasR9
R12 SameasRB
R13
Thru SameasR9
R15
R16 Sameas·R8
R17
Thru Same as R9
R19
R20 SameasRI
R21 SameasR9
R22
Thru SameasR3
R24
R25
Thru Not Used
R37
R38 SameasR9
R39 Resistor, Fixed, Film: 270,5%, 1/4 W 2 CF1I4-270HMSlJ 09021
R40 Resistor, Fixed, Film: 390,5%,1/4 W 5 CF1I4·39 OHMSlJ 09021
5-19

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA7Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART. NO. CODE VENDOR
R41
R42
R43
R44
R45
R46
R47
R48
R49
R50
SameasR39
Same as R9
SameasR9
SameasR40
SameasR1
SameasR40
SameasR9
SameasR9
SameasR40
SameasR1
R51 Resistor, Fixed, Film: 820,5%, 114 W 1 CF1I4-82 OHMSlJ 09021
R52
R53
R54
SameasR1
SameasR40
Same as R9
U1 Integrated Circuit 2 MC3403P 04713
U2
SameasU1
U3 Integrated Circuit 1 MC1458N 18324
5-20

WJ-9205
REPLACEMENT PARTS LIST
5.5.1.6.2 Type 796544-1 Input Filter Assembly
REF DESIG PREFIX A1A7A2
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision A
Cl Capacitor, Ceramic, Monolithic: 150 pF; ±2%, 100 V 2 150-100-NPO-151G 51642
C2 Capacitor, Ceramic, Monolithic: 240 pF, ±2%, 100 V 2 150-100-NPO-241G 51642
C3 Capacitor, Ceramic, Monolithic: 270 pF, ±2%, 100 V 1 150~100-NPO-271G 51642
C4 SameasC2
C5 Same asCI
C6 Capacitor, Ceramic, Disc: .01IlF, 20%, 50 V 5 34453-1 14632
C7 SameasC6
C8 Capacitor, Electrolytic, Tantalum: 4.71lF, 20%, 35 V 2 196D475X0035JE3 56289
C9 SameasC6
CI0 SameasC6
Cll SameasC8
C12 SameasC6
Ll Inductor: .4871lH, 1% 2 LI0-0R487 7W259
L2 Inductor: .4641lH, 1% 2 LI0-0R464 7W259
L3 SameasL2
L4 SameasLl
L5 Coil, Fixed: 47~, 10% 1 1025-60 (75085-3) 99800
Ql Transistor 2 U310 17856
Q2 SameasQl
Rl Resistor, Fixed, Film: 470,5%,114 W 2 CF1I4-47 OHMS 09021
R2 Resistor, Fixed, Film: 100,5%,114 W 2 CF1I4-10 OHMSlJ 09021
R3 Resistor, Fixed, Film: 1.2 kO, 5%, 114 W 2 CF1I4-1.2KJJ 09021
R4 SameasR3
R5 SameasR2
R6 SameasRl
Tl TranSformer 1 T9-1 15542
5-21

REPLACEMENT PARTS LIST
WJ-9205
5.5.1.7 Type 796562-1 Frequency Converter/Sweep
Assembly
REF DESIG PREFIX A1A8
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision A
Al First LO, First Converter, Auto Centering Assembly 1 796540-1 14632
A2 Second LO, Second Converter Assembly 1 796541-1 14632
A3 Second lFIRBW (10kHz) Assembly 1 796542-1 14632
Cl Filter: 1750 pF 18 4101-000 59660
C2
Thru SameasCI
C18
C19 Capacitor, Variable, Air: .8"10.0 pF, 250V 3 5202 WILOCK WASHER 91293
C20 SameasC19
C21 Same asC19
C22 Capacitor,Ceramic, Monolithic: 15 pF, ±2%,100 V 2 100-100-NPO-150G 51642
C23 Ca\>acitor; Ceramic, Monolithic: 10 pF, ± 2%,100 V 1 100-100-NPO-I00G 51642
C24 SameasC22
Jl Connector, Receptacle, 5MB 1 2012-7511-000 19505
Ll Coil, Fixed, Gen Inductor: .178lili, 1% 3 LI0-0R178 7W259
L2 SameasLl
L3 SameasLI
L4 Coil, Fixed: .47lili 2 1025-12 99800
L5 SameasL4
L6 Coil, Fixed, 2.2lili, 10% 2 1025-28 (75084-4) 99800
L7 Same as L6
PI Receptacle Assembly 2 66527-010 22526
P2 SameasPI
5-22

WJ-9205
REPLACEMENT PARTS LIST
5.5.1.7.1 Type 796540-1 PirstLOlPirst Converterl
Auto Centering Assembly
REP DESIG PREFIX A1A8A1
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionCI
Cl Capacitor, Electrolytic, Tantalum: 18 pF,10%,20 V 10 196D186X9020KE3 56289
C2 Same asCI
C3 Same asCI
C4 Capacitor, Ceramic, Monolithic: 1000 pF, ±2%,100 V 12 150-100-NPO-1 02G 51642
C5 Capacitor, Ceramic, Monolithic: 470 pF, ±2%,100 V 3 150-100-NPO-471G 51642
C6 Capacitor, Ceramic, Chip: 47 pF, 2%, 500 V 1 ATC700B470GP500X 29990
C7 Capacitor, Ceramic, Monolithic: 2200 pF, ± 2%, 100 V 2 200-100-NPO-222G 51642
C8 Capacitor, Ceramic, Disc: I pF, 20%, 50 V 3 8131-050-651-105M 59660
C9 SameasC8
C10 Capacitor, Ceramic, Monolithic: 27 pF, ±2%,100 V 2 150-100-NPO-270G 51642
Cll SameasC10
C12 Capacitor, Variable, Ceramic: 5-25 pF,100 V I 518-000A5-25 59660
C13 Capacitor, Variable,Air: l.0-10.0pF,250V I 8052 91293
C14 Capacitor, Ceramic,Chip: 4.7 pF, ±.25 pF,500 V 1 ATCI00B4R7CP500X 29990
C15 Capacitor, Ceramic, Chip: 10 pF, 2%, 500 V 1 ATC700B100GP500X 29990
C16 Capacitor, Ceramic, Chip: 24°pF, 5%, 500 V I ATC700B240JP500X 29990
C17 Same asCI
C18 Same asCI
C19 SameasC4
C20 Capacitor, Ceramic, Disc: .01 11F, 20%, 50 V 2 34453-1 14632
C21 Capacitor, ElectrolytiC, Tantalum: 220 llF, 20%,10 V 2 196D227XOOI0FE4 56289
C22
Thru Same as C4
C26
C27 SameasC21
C28
Thru SameasC4
C30
C31 Capacitor, Ceramic, Disc: .1 11F, 20%, 50 V I 34475-1 14632
C32
Thru Same asCI
C34
C35 Capacitor, Polycarbonite: .22 llF, 10%,135 V 1 912AIC224K 14752
C36 Same asCI
C37 SSmeasC20
C38 SameasC8
C39 SameasC5
C40 SameasC5
C41 Same asC4
C42 SameasC4
C43 Same asCI
C44 Capacitor, Ceramic, Monolithic: 47 pF, ± 2%,100 V I 150-100-NPO-470G 51642
C45 SameasC7
5-23

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA8Al
QTV
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSV PART NO. CODE VENDOR
CRI Diode 1 IN4005 80131
CR2 Diode, Varicap: 26 pF-32 pF at3 V 4 KV3901 52673
CR3
Thru Same as CR2
CRS
CR6 Diode 5 IN4449 80131
CR7
Thru SameasCR6
CRI0
DLIA Delay Line 2 281213-1 14632
DLlB
SameasDLIA
DLIC Delay Line 1 281213-3 14632
Ll Coil, Fixed: 2.2 pH, 10% 2 1025-28 (75084-4) 99800
L2 Coil, Fixed: 1.2 pH, 10% I 1025-22 (75084-1) 99800
L3
SameasLI
L4 Coil,Fixed: 47pH,10% 1 1025-60 (75085-3) 99800
1.5 Coil, Fixed, Molded: 4.7 pH, 10% I 1025-36 (75084-8) 99800
QI Transistor I U310 17856
Rl Resistor, Fixed, Film: 4.7n, 5%,114 W 2 CFlI4-4.70HMSlJ 09021
R2 Resistor, Fixed, Film: 2.7 kn, 5%, 1/4 W I CF1I4-2.7KfJ 09021
R3 Resistor, Fixed, Film: 2.7n, 5%,114 W I CFl/4-2.70HMSlJ 09021
R4 Resistor, Fixed, Film: 5.11 kn, 1%, 1110 W I RN55C511IF 81349
RS Resistor, Fixed, Film: 7.5 kn, 1%, 1/10 W I RN55C750lF 81349
R6 Resistor, Fixed, Film: lOn, 5%,1/4 W 2 CF1I4-IOOHMSlJ 09021
R7 Resistor, Fixed, Film: 27 kn, 5%,1/4 W 2 CF1/4-27KfJ 09021
R8 Resistor, Fixed, Film: 27 kn, 5%, 1/8 W I CF1I8-27KfJ 09021
R9 Resistor, Fixed, Film: II kn,l%,1/10 W I RN55CII02F 81349
RIO Resistor, Fixed, Film: 1l.5 kn, 1%,1/10 W I RN55C1l52F 81349
Rll Resistor, Fixed, Film: 7.5 kn, 1%,1110 W 1 RN55C750lF 81349
RI2 Resistor, Fixed, Film: 13.3 kn,l%,1/10 W I RN55C1332F 81349
RI3 Resistor, Fixed, Film: 15 kn, 1%,1/10 W I RN55CI502F 81349
RI4 Resistor, Fixed, Film: 3.83 kn, 1%, 1110 W I RN55C3831F 81349
R15 Resistor, Fixed, Film: 5.62 kn, 1%, 1110 W 1 RN55C5621F 81349
RI6 Resistor, Fixed, Film: 22Hl,1%,1/10 W I RN55C2210F 81349
RI7 Resistor, Fixed, Film: 47n, 5%, 1/4 W I CF1/4-47 OHMS 09021
RI8 Resistor, Fixed, Film: 3.9 kn, 5%,1/4 W I CF1/4-3.9KfJ 09021
R19 Resistor, Fixed, Film: 1.5 kn, 5%,114 W I CFlI4-1.5KfJ 09021
R20 Resistor, Fixed, Film: 1.0 kn, 5%, 114 W 3 CF1/4-1K1J 09021
R21 Resistor, Fixed, Film: 10 kn, 5%,114 W I CF1/4-IOKfJ 09021
R22 Resistor, Fixed, Film: 470n, 5%, 1/4 W 3 CF1I4-470 OHMSlJ 09021
R23 Resistor, Fixed, Film: 68n, 5%, 114 W 1 CF1/4-680HMSlJ 09021
R24
SameasR6
R25 Resistor, Fixed, Film: lOOn, 5%,114 W 2 CF1I4-1000HMSlJ 09021
5-24

WJ-9205
REPLACEMENT PARTS LIST
REF DESIG PREFIX AIA8Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
R26 Resistor, Fixed, Film: 47 kO, 5%,114 W 1 CF1I4-47K/J 09021
R27 Resistor, Fixed, Film: 6.80,5%,114 W 2 CF1I4-6.80HMSlJ 09021
R28
Same as R27
R29 Resistor, Fixed, Film: 22 0,5%, 114 W 2 CF1I4-220HMSlJ 09021
R30
SameasRI
R31 Resistor, Fixed, Film: 3000,5%,114 W 2 CF1I4-300 OHMSlJ 09021
R32 Resistor, Fixed, Film: 180,5%,114 W 1 CF1I4-180HMSlJ 09021
R33
R34
SameasR31
SameasR29
R35 ResistOr, Fixed, Film: 4.75 kQ, 1%, 1/10W 1 RN55C4751F 81349
R36 Resistor, Fixed, Film: 7.5 kO, 5%, 1/4 W 1 CF1I4-7.5K/J 09021
R37 Resistor, Fixed, Film: 10 kO,1%,1110 W 1 RN55CI002F 81349
R38
SameasR25
R39 Resistor, Fixed, Film: 9.09 kQ, 1%,1110 W 1 RN55C9091F 81349
R40 Resistor, Fixed, Film: 2.2 kO, 5%, 114 W 5 CF114-2.2K/J 09021
R41 Resistor, Fixed, Film: 47.5 kQ,1%,1110 W 1 RN55C4752F 81349
R42
R43
Same as R22
Same as R22
R44 Resistor, Trimmer, Film: 5 kQ, 10%,1/2 W 1 62PAR5K 73138
R45 Resistor, Fixed, Film: 9090,1%,1110 W 1 RN55C9090F 81349
R46
R47
R48
SarneasR7
Same as R20
SameasR20
R49 Resistor, Fixed, Film: 470 kQ, 5%,114 W 2 CF1I4-470K/J 09021
R50
R51
Thru
R54
SameasR49
Same as R40
Tl Transformer 2 T2-lT 15542
T2
SameasTI
U1 Integrated Circuit 1 MCI723CP 04713
U2 Integrated Circuit 1 MWA120 04713
U3 Amplifier RF 2 MWA130 04713
U4
SameasU3
U5 Mixer, Balanced 1 TAK-3H 15542
U6 Amplifier 1 QBH-137 55027
U7 Voltage Regulator 1 UA78M05HC 07263
U8 Integrated Circuit 1 MC145146P 04713
U9 Integrated Circuit 1 SP8690BIDG 52648
UI0 Integrated Circuit 1 MC34002P 04713
un Integrated Circuit 1 LM336Z-5.0 27014
U12 Integrated Circuit 1 LF398AN 27014
5-25

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA8Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Ut3 Integrated Circuit 1 LTI007CN8 4W715
Ut4 Integrated Circuit 1 MM74HC32N 27014
UI5 Integrated Circuit 2 MM74HC74N 27014
Ut6 Integrated Circuit 1 MM74HC04N 27014
UI7 SameasU15
UI8 Integrated Circuit 1 MM74HCI32N 27014
YI Crystal, Quartz 1 CR64U 5.000 MHz 80058
5-26

WJ-9205
REPLACEMENT PARTS LIST
5.5.1.7.2 Type 796541-1 Second LO/Second Converter Assembly
REF DESIG PREFIX A1A8A2
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionC
Cl Not Used
C2 Capacitor, Electrolytic, Tantalwn: 4.7 pF, 20%, 35 V 3 196D475X0035JE3 56289
C3 Capacitor, Ceramic, Monolithic: 1000 pF, ±2%,100 V 7 150-100-NPO-I02G 51642
C4 Capacitor, Cermaic, Monolithic: 27 pF, ±2%,100 V 1 150-100-NPO-270G 51642
C5 Capacitor, Ceramic, Monolithic: 68 pF, ±2%,100 V 1 200-100-NPO-680G 51642
C6 Capacitor, Ceramic, Monolithic: 100 pF, ±2%,100 V 1 200-100-NPO-l01G 51642
C7 Capacitor, Ceramic, Monolithic: 15pF ±2%,100 V 2 100-100-NPO-150G 51642
C8 Capacitor, Ceramic, Monolithic: 47 pF, ±2%,100 V 1 150-100-NPO-470G 51642
C9 SameasC7
CI0 SameasC2
Cll
Thru SameasC3
C13
C14 SameasC2
C15
Thtu SameasC3
C17
Ll Coil, Variable: 0.135-0.165IlH 1 558-7107-03 71279
L2 Coil, Fixed, Molded: .1 pH 2 1025-94 99800
L3 SameasL2
Ql Transistor 1 U310 17856
Rl Resistor, Fixed, Film: 47Q, 5%,114 W 3 CF1I4-470HMSlJ 09021
R2 Resistor, Fixed, Film: 10Q, 5%,114 W 4 CF1I4-10 OHMSlJ 09021
R3 Resistor, Fixed, Film: 220Q, 5%,114 W 1 CF1I4-220 OHMSlJ 09021
R4 Resistor, Fixed, Film: 300Q, 5%,114 W 4 CF1I4-300 OHMSlJ 09021
RS Resistor, Fixed, Film: 18Q, 5%,114 W 2 CF1I4-180HMSlJ 09021
R6 SameasR4
R7 Resistor, Fixed, Film: 68Q, 5%,114 W 1 CF1I4-680HMSlJ 09021
R8 Same as R2
R9 SameasRl
RIO SameasRl
Rll Same as R2
R12 Same as R2
R13 SameasR4
R14 SameasRS
R15 SameasR4
R16 Resistor, Fixed, Film: 47Q, 5%,118 W 1 841296-33 14632
Tl Transformer 2 T2-1T 15542
T2 SameasTl
Ul Amplifier RF 1 MWA-120 04713
U2 Amplifier RF 2 MWA-130 04713
U3 SameasU2
U4 Mixer, Balanced 1 TAK-3H 15542
5-27

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA8A2
Qtv
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
WI Wire 1 281213-1 14632
Yl Crystal, Quartz 1 CR561U 86.000 MHz 80058
ZI Balun 1 281179-1 14632
5-28

WJ-9205
REPLACEMENT PARTS LIST
5.5.1.7.3 Type 796542-1 Second IF/RBW (10 kHz) Assembly
REF DESIG PREFIX A1A8A3
QTY
REF PER MANUFACTURER'S MFR. R~CM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision A
Cl Capacitor, Ceramic, Disc: .1 JlF, 20%, 50 V 9 34475-1 14632
C2 SameasCI
C3 SameasCI
C4 Capacitor, Ceramic, Monolithic: 27 pF, ±2%, 100 V 2 150-100-NPO-270G 51642
C5 Capacitor, Ceramic, Monolithic: 6.8 pF, ±2%, 100 V 2 100-100-NPO-689C 51642
C6 SameasC5
C7 SameasC4
C8
Thru SameasCI
CI0
Cll Capacitor, Ceramic, Monolithic: 20 pF, ±2%, 100 V 2 100-100-NPO-200G 51642
C12 Capacitor, Ceramic, Monolithic: 15 pF, ±2%, 100 V 2 100-100-NPO-150G 51642
C13 SameasC12
C14 Same asCII
C15
Thru Same asCI
C17
C18 Capacitor, Ceramic, Disc: .47 JlF, 20%, 50 V 1 34452-1 14632
CRI Diode 2 5082-3188 28480
CR2 SameasCRl
FLl Filter, Crystal 2 5261/UMB 25120
F1.2 Same as FLI
Ll Coil, Fixed, Molded: 15lili, 10% 6 1025-48 (75084-14) 99800
1.2 SameasLl
L3 Coil, Variable: 5.04 - 6.1611H 4 558-7107-22 71279
L4 SameasL3
L5 SameasLI
L6 SameasLI
L7 SameasL3
L8 SameasL3
L9 SameasLl
LI0 SameasLl
Ql Transistor 1 2N2907/JAN 81350
Rl Resistor, Fixed, Film: 3900,5%,114W 2 CF1I4-390 OHMSlJ 09021
R2 Resistor, Fixed, Film: 560,5%,114 W 2 CF1I4-560HMSlJ 09021
R3 Same as R2
R4 SameasRl
R5 Resistor, Fixed, Film: 4.7 kO, 5%,1/4 W 1 CF1/4-4.7K1J 09021
R6 Resistor, Fixed, Film: 4700,5%,1/4 W 1 CF1/4-470 OHMSlJ 09021
R7 . Resistor, Fixed, Film: 3000,5%,1/4 W 2 CF1I4-300 OHMSlJ 09021
R8 SameasR7
R9 Resistor, Fixed, Film: 180,5%,1/4 W 1 CFl/4-180HMSlJ 09021
5-29

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIA8A3
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
U1 Amplifier 2 MWA-220 04713
U2 SameasUI
U3 Voltage Regulator: +5 V 1 UA78M05HC 07263
VRI Diode, Zener: 3.3 V. ' 1 IN746A 80131
5-30

WJ-9205
REPLACEMENT PARTS LIST
5.5.1.8 Type 796790-1 Second 1F/2 kHz RBW
Assemblv (Optional)
REF DESIG PREFIX AIA9
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision A
Al Second IFI2 kHz RBW, PC Board 1 381939-1 14632
Cl Filter 4 4101-000 59660
C2
Thru SameasCI
C4
5-31

REPLACEMENT PARTS LIST
WJ-9205
5.5.1.8.1 Part 381939-1 Second IF/2 kHz RBW,
PC Board
REF DESIG PREFIX A1A9A1
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision B
C1 Capacitor, Electrolytic, Tantalum: 4.7 IIF, 20%, 35 V 1 196D475X0035JE3 56289
C2 Capacitor, Ceramic, Disc: ;01 pF, 20%, 50 V 9 34453-1 14632
C3 Capacitor, Ceramic, Disc: 1 IIF, 20%, 50 V 2 8131-050-651-105M 59660
C4
C5
Thru
C9
SameasC3
SameasC2
C10 Capacitor, Ceramic, Disc: 1 IIF, 20%, 50 V 1 34475-1 14632
Cll
Thru SameasC2
C13
CRI Diode 2 5082-3188 28480
CR2
SameasCRI
FLl Filter, Bandpass 1 92518 14632
Ll Coil, Fixed, Molded: 15 pH, 10% 3 1025-48 (75084-14) 99800
L2
NotVsed
1.3 Same as L1
L4
SameasLl
Q1 Transistor 1 2N2219A 04713
R1 Resistor, Fixed, Film: 4.7Q,5%, 1/4 W 2 CF1/4-4.70HMSlJ 09021
R2 Resistor, Fixed, Film: 2.2 kQ, 5%, 1/4 W 2 CF1I4-2.2K1J 09021
R3 Resistor, Fixed, Film: 1.0 kQ, 5%, 1/4 W 1 CF1/4-1K1J 09021
R4 Resistor, Fixed, Film: 220 kQ, 5%,1/4 W 1 CF1/4-220KlJ 09021
RS
SameasRl
R6 Resistor, Fixed, Film: 330Q, 5%, 1/4 W 1 CF1I4-330 OHMSlJ 09021
R7
SameasR6
R8 Resistor, Fixed, Film: 300Q, 5%,1/4 W .•
CF1I4-300 OHMSlJ 09021
R9 Resistor, Fixed, Film: 4.7Q, 5%, 1/4 W 1 CF1/4-4.70HMSlJ 09021
RIO Resistor, Fixed, Film: 10 kn, 5%, 1/4 W 1 CFl/4-lOKlJ 09021
Rll Resistor, Fixed, Film: 150Q, 5%,1/4 W 1 CF1I4-1500HMSlJ 09021
R12 Resistor, Fixed, Film: 130n, 5%, 114 W 1 CFl/4-130 OHMSlJ 09021
R13 Resistor, Fixed, Film: 30n, 5%, 1/4 W 1 CF1/4-30 OHMSlJ 09021
R14 Resistor,Fixed,Film: 180n,5%, 114 W 2 CF1I4-180 OHMSlJ 09021
R15
R16
SameasR2
SameasR14
R17 Resistor, Fixed, Film: 39Q,5%, 1/4 W 1 CF1/4-390HMSlJ 09021
R18 Resistor, Fixed, Film: 18n,5%, 114 W 1 CF1/4-180HMSlJ 09021
R19 Resistor, Trimmer, Film: 50n, 10%,112 W 1 62PARSO 73138
R20 Resistor, Fixed, Film: 240n, 5%,1/4 W 1 CF1/4-240 OHMSlJ 09021
VI Integrated Circuit 1 TL081CP 01295
V2 Amplifier 1 MWA-220 04713
V3 Amplifier, RF 1 MWA120 04713
5-32

WJ-9205
REPLACEMENT PARTS LIST
. . .
5519
Type 796577-1 LOG IF AmDlifier/Detector Assemblv
REF DESIG PREFIX A1A10
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSV' PART NO. CODE VENDOR
Revision A
Al LOG IFlDetectorAssembly I 796506-2 14632
CI Not Used
C2 Not Used
C3 Capacitor, Ceramic, Feedthru: 1000 pF,500 V 4 54-794-009-102W 33095
C4 SameasC3
C5 SameasC3
C6 Not Used
C7 SlimeasC3
PI Receptacle Assembly I 66527-010 22526
5-33

REPLACEMENT PARTS LIST
WJ-9205
5.5.1.9.1 Type 796506-2 LOG IFIDetector Assembly REF DESIG PREFIX AIAIOAI
QTY
REF PER MANUFAaURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionDI
Cl Capacitor, Ceramic, Disc: .01 pF, 20%, 50 V 15 34453-1 14632
C2 Capacitor, Ceramic, Monolithic: 150 pF, ±2%, 100 V 1 150-100-NPO-151G 51642
C3 Capacitor, Ceramic, Monolithic: 360 pF, ±2%, 100 V 1 150-100-NPO-361G 51642
C4 Same asCI
C5 Capacitor, Ceramic, Monolithic: 75 pF, ±2%, 100 V 1 200-100-NPO-750G 51642
C6
Thru Same asCI
C9
CI0 Capacitor, Electrolytic, Tantalwn: 4.7 pF, 20%, 35V 8 196D475X0035JE3 56289
Cll Capacitor, Ceramic, Disc: .022 pF, 10%, 100 V 7 CK06BX223K 81349
C12 Same asCI
C13 Capacitor, Ceramic, Monolithic: 120 pF, ± 2%, 100 V 2 200-100-NPO-121G 51642
C14 Same asCI
C15 Same as Cll
C16 Same asCI
C17 Same asCII
C18 Same asCI ,
C19 SameasCIO
C20 Same asCII
C21 Same asCI
C22 SameasCl3
C23 Same asCI
C24 Same asCII
C25 Same asCI
C26 SameasCI0
C27 Same asCII
C28 Same asCI
C29 SameasCll
C30 Same asCI
C31 Capacitor, Ceramic, Monolithic: 1500 pF, ±2%, 100 V 2 150-100-NPO-152G 51642
C32 SameasC31
C33 SameasCI0
C34 SameasC10
C35 Capacitor, Ceramic, Monolithic: 1000 pF, ±2%, 100 V 1 150-100-NPO-I02G 51642
C36
Thru SameasCI0
C38
CR1 Diode 1 1N4449 80131
L1 Coil, Fixed, Molded: 0.82 pH, 10% 1 1025-18 99800
L2 Coil, Fixed: 0.39 pH, 10% 1 1025-10 (75083-8) 99800
L3 Coil, Variable: 2.43-2.97 pH 1 558-7107-18 71279
L4 Coil, Fixed: 18pH, 10% 3 1025-50 (75084-15) 99800
5-34

WJ-9205
REPLACEMENT PARTS LIST
REF DESIG PREFIX AIAI0Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
L5 Same as L4
L6 Coil, Variable: 1.98-2.42lili 2 -558-7107-17 71279
L7 Same as L4
L8 Same asL6
Q1 Transistor 1 U310 17856
Q2 Transistor 1 2N2102 80131
Rl Resistor, Fixed, Film: 1.5 kQ, 5%,114 W 3 CF1I4-1.5KJJ 09021
R2 Resistor, Variable, Film: 200Q,10%,l/2 W 1 62PAR200 73138
R3 Resistor, Fixed, Film: 1000,5%, 1/4 W 2 CF1/4-100 OHMSlJ 09021
R4 Resistor, Fixed, Film: 10Q, 5%, 1/4 W 8 CF1/4-10 OHMSlJ 09021
RS Resistor, Fixed, Film: 1.0 kQ, 5%,1/4 W 7 CF1/4-1KJJ 09021
R6 SameasRl
R7 Same as R4
R8 Same as R5
R9 Resistor, Fixed, Film: 47Q, 5%,1/4 W 4 CFl/4-470HMSlJ 09021
RIO Same as R4
Rll SameasRS
R12 Same as R9
R13 Same as R4
R14 Same as RS
R15 Same as iu
R16 SameasR4
R17 SameasRS
R18 Same as R9
R19 Same as R4
R20 SameasRS
R21 Same as R9
R22 Same as R4
R23 Same as RS
R24 Resistor, Fixed, Film: 4.7 kQ, 5%,1/4 W 2 CF1/4-4.7KJJ 09021
R25 Same as R3
R26 Resistor, Fixed, Film: 10 kQ, 1%, 1/10 W 2 RN55ClO02F 81349
R27 SameasR26
R28 Resistor, Fixed, Film: 18.2 kQ, 1%, 1/10 W 2 RN55C1822F 81349
R29 Same as R28
R30 Resistor, Trimmer, Film: 10 kQ, 10%, 1/2 W 1 62PARI0K 73138
R31 Resistor, Fixed, Film: 10 kQ, 5%,1/10 W 1 CF1/4-10KJJ
R32 Resistor, Fixed, Filin: 51 kQ, 5%,1/4 W 1 CF1/4-51KJJ 09021
R33 Resistor, Fixed, Film: 5.1 kQ, 5%,1.4 W 1 CF1/4-5.1KJJ 09021
R34 Resistor, Trimmer, Film: lOOn, 10%, 1/2 W 1 62PAR100 73138
R35 Same as R24
5-35

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX AIAIOAI
QTY
REF PER MANUFAcTuRER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
R36 Resistor, Fixed, Film: 100 kO, 5%,114 W 2 CFlI4-100KlJ 09021
R37 SameasR36
R38 Resistor, Fixed, Film: 6200; 5%,114 W 1 CFlI4-620 OHMSlJ 09021
R39 Resistor, Fixed, Film: 100 kO,1%,1110 W 1 RN55C1003F 81349
R40 Resistor, Fixed, Film: 2320, 1%, 1110 W 1 RN55C2320F 81349
R41 Resistor, Fixed, Film: 402 kO, 1%, 1110 W 1 RN55C4023F 81349
R42 Not Used
R43 Resistor, Fixed, Film: 2.0 kO,1%,1110 W 1 RN55C2001F 81349
R44 Resistor, Fixed, Film: 12.1 kO,1%,1I10 W 1 RN55C12i2F 81349
R45 Resistor, Fixed, Film: 2.70,5%,114 W 2 CFlI4-2.70HMSlJ 09021
R46 SameasR45
R47 SameasR4
RAI Heatsink 1 22258 13103
U1 Integrated Circuit 7 SL521C/CM 52648
U2
Thru SameasUI
U7
U8 Integrated Circuit 2 TL082ACP 01295
U9 SameasU8
UIO Integrated Circuit: VR +6 V 1 MC1723CP 04713
5-36

wi...9205
REPLACEMENT PARTS LIST
5.5.2 TYPE 796782-1 mGH VOLTAGE POWER
SUPPLY/VIDEO
REF DESIG PREFIX A2
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY pART NO. CODe VENDOR
.,
RevisionBl
Al High Voltage Power SupplylDeflection 1 796545-1 14632
Amplifier Assembly
AIPI SocketCRT 1 3B14 71785
VI Tube, CRT 1 481445-1 14632
5-37

REPLACEMENT PARTS LIST
WJ-9205
5.5.2.1 Type 796545-1 High Voltage Power Suwlv!
Deflection Amplifier Assemblv .
REF DESIG PREFIX A2Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOIl
Revision HI
Cl Capacitor, Electrolytic, Tantalwn: 18 pF,10%,20 V 9 196D186X9020KE3 56289
C2
Thru Same asCI
C4
C5 Capacitor, Ceramic, Monolithic: 5100 pF, ±2%,100 V 1 300-100-NPO-512G 51642
C6 Capacitor, Ceramic, Disc: .47 pF,20%, 50 V 2 34452-1 14632
C7 SameasC6
C8
Thru Sa·measCI
CI0
Cll Capacitor, Ceramic, Disc: .1 pF, 20%, 50 V 1 34475-1 14632
C12 Capacitor, Ceramic, Disc: .01 pF, 20%, 50 V 1 34453-1 14632
C13 Same asCI
C14 SameasCl
C15 Capacitor, Ceramic, Disc: 2200 pF, 20%, 3 KVDC 4 30GA-D22 56289
C16 SameasC15
C17 Capacitor, Electrolytic, Tantalwn: 27 pF,10%, 35 V 1 196D276X9035TE4 56289
C18 SameasC15
C19 SameasC15
C20 Capacitor, Ceramic, Disc: .01 pF, 20%, 3 KVDC 1 30GAS10 56289
C21 Capacitor, Myl, Dipped: .22 pF, 20%,400 V 1 B32234B6224M 25088
C22 Capacitor, Ceramic, Disc: .01 pF,10%, 200 V 1 CK06BXI03K 81349
C23 Capacitor, Ceramic, Monolithic: 100 pF, ±2%,100 V 2 200-100-NPO-101G 51642
C24 SameasC23
CRI Diode 2 MR851 04713
CR2 SameasCRI
CR3 Diode, Rectifier 5 VA30X 8K838
CM
Thru SameasCR3
CR7
Ll Inductor 2 5258 76493
L2 SameasLl
PI Connector, Receptacle 1 609-2030 15912
Ql Transistor 2 IRF-822 81483
Q2 SameasQ1
Q3 Transistor 3 2N3904 80131
Q4 Transistor 1 TIP30 04713
Q5 Transistor 4 2N3439 80131
Q6 SameasQ5
Q7 SameasQ3
Q8 SameasQ5
Q9 SameasQ5
QI0 SameasQ3
5-38

WJ-9205
REPLACEMENT PARTS LIST
REF DESIG PREFIX A2Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION . ASSY PART NO. CODE VENDOR
Rl Resistor, Fixed, Film: 1.5 kO, 5%,114 W 2 CF1I4-1.5KJJ 09021
R2 Same as Rl
R3 Resistor, Fixed, Film: 3.65 kO,1%,1110 W 1 RN55C3651F 81349
R4 Resistor, Fixed, Film: 22.10,1%,1110 W 1 RN55D22RIF 81349
RS Resistor, Fixed, Film: 1.0 kO, 5%,114 W 4 CF1I4-1KJJ 09021
R6 SameasRS
R7 Resistor, Fixed, Film: 27 kO, 5%, 1I4W 2 CF1I4-27KJJ 09021
R8 SameasRS
R9 Resistor, Fixed, Film: 3300,5%,114 W I CF1I4-330 OHMSJJ 09021
RIO Same as RS
Rll Resistor, Fixed, Film: 22 kQ, 5%,114 W 1 CF1I4-22KJJ 09021
R12 Resistor, Fixed, Film: 2.7M, 5%,114 W 8 CF1I4-2.7MJJ 09021
RI3
Thru SameasR12
RI9
R20 Resistor, Trimmer, Film: .20 kO, 10%, 1/2 W 2 62PAR20K 73138
R21 Resistor, Fixed, Film: 43 kO, 5%,114 W I CF1I4-43KJJ 09021
R22 Resistor, Fixed, Film: 47 kO, 5%,114 W 4 CFi/4-47KJJ 09021
R23 Resistor, Variable, Composition: 500 kO,IO%, 1 W I 12MIN048S504U 01121
R24 Resistor, Fixed, Film: 1.5 M, 5%,114 W I CF1I4-1.5MJJ 09021
R25 Resistor, Trimmer, Film: 1 M, 10%,I/2W I .62PARIM 73138
R26 Resistor, Fixed, Film: 1.0 M, 5%,114 W 5 CF1I4-1MJJ 09021
R27
Thru SameasR26
R30
R31 Resistor, Fixed, Film: 6200,5%,114 W 2 CF1I4-6200HMSJJ 09021
R32 Same as R31
R33 Resistor, Fixed, Film: 10 kO,1%,1110 W 8 RN55CI002F 81349
R34
Thru SameasR33
R36
R37 Resistor, Trimmer, Film: 10 kO, 10%, 1/2 W 7 62PARI0K 73138
R38 Resistor, Fixed, Film: 2.7 kO, 5%,114 W 1 CF1I4-2.7K1J 09021
Ra9 Same as R37
R40 Resistor, Fixed, Film: 270 kO, 5%,114 W 3 CF1I4-270KJJ 09021
R41 Resistor, Fixed, Film: 51.1 kO, 1%,1110 W 2 RN55C5112F 81349
R42 Resistor, Fixed, Film: 5.11 kO,I%, 1110W I RN55C511IF 81349
.
R43 SameasR20
R44 Resistor, Fixed, Film: 10 kO,5%, 114 W 2 CF1I4-IOKJJ 09021
R45 SameasR37
R46 Resistor, Fixed, Film: 470 kQ, 5%, 114 W 1 CF1I4-470KlJ 09021
R47 Resistor, Fixed, Film: 130 kQ, 5%, 114 W 1 CF1/4-130KlJ 09021
R48 Resistor, Fixed, Film: 100 kO, 5%,114 W 3 CF1I4-100KlJ 09021
R49 Same as R48
5-39

REPLACEMENT PARTS LIST
WJ-9205
REF DESIG PREFIX A2Al
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
R50 Resistor, Trimmer, Film: 500 kQ,10%, 112 W 1 62PARSOOK 73138
R51 Resistor, Fixed, Film: 3.01 kQ, 1%,1110 W 2 RN55C3011F 81349
R52 Same as RSI
RS3 SameasR33
R54 Resistor, Fixed, Film: 4.75 kQ, 1%,1110 W 2 RN55C4751F 81349
R55 Resistor, Fixed, Film: 1.82 kQ,1%,1110 W I RN55CI821F 81349
R56 SameasR37
R57 Resistor, Fixed, Film: 4.7 kQ, 5%,114 W I CF1I4-4.7K/J 09021
RS8 SameasR41
R59 SameasR40
R60 Same as R40
R61 SameasR37
R62 SameasR48
R63 SameasR33
R64 SameasR37
R65 Same asR44
R66 Resistor, Fixed, Film: 68 kQ, 5%, 114 W I CF1I4-68K/J 09021
R67 SameasR22
R68 SameasR22
R69 Same as R7
R70 Resistor, Trimmer, Film: 100 kQ, 10%, 112 W 2 62PARI00K 73138
R71 Resistor, Fixed, Film: 1.5 kQ, 1%,1110 W 2 RN55C1501F 81349
R72 SameasR11
R73 Resistor, Fixed, Film: 220 kQ, 5%,114 W 1 CFli4-220K/J 09021
R74 SameasR37
R75 Same asR33
R76 SameasRS4
R77 Resistor, Fixed, Film: 1.0 kQ,1 %,1110 W 1 RN55CI00IF 81349
R78 SameasR33
R79 Resistor, Fixed, Film: 20 kQ,1 %,1110 W 1 RN55C2002F 81349
RsO SameasR70
RBI Same as R22
Tl Transformer 1 381029-2 14632
U1 Integrated Circuit 2 LM336Z-5.0 27014
U2 SameasUI
U3 Integrated Circuit 5 TL082ACP 01295
U4 Integrated Circuit 1 SG3526N 04713
U5 SameasU3
U6 Same as U3
U7 Integrated Circuit 1 DG303ACJ 17856
U8 SameasU3
U9 Same as U3
5-40

WJ.;.9205
REPLACEMENT PARTS LIST
5.5.3 TYPE 796771-1 LOW VOLTAGE
POWER SUPPLY ASSEMBLY
REF DESIG PREFIX A3
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
RevisionBI
CI Capacitor, Ceramic, Disc: .01IlF, 20%, 50 V 4 34453-1 14632
C2 Capacitor, Electrolytic, Tantalum: 4.7IlF, 20%,35 V 4 I 96D475X0035JE3 56289
C3 SameasC2
C4 SameasC2
C5
Thru Same asCI
C7
C8 Capacitor, Electrolytic, Aluminum: 6800 1lF, -10 + 30%, 25 V 4 ECE-T25R682SW 54473
C9
Thru SameasC8
C11
C12 SameasC2
CR1 Diode 2 MR851 04713
CR2 SameasCR1
J1 Connector, Receptacle I 09-72-2091 27264
L1 Ferrite Choke 4 VK200-10-3B 02114
L2
Thru SameasL1
L4
R1 Resistor, Fixed, Film: 2430,1%,1110 W I RN55C2430F 81349
R2 Resistor, Fixed, Film: 1.33 kg, 1%,1110 W I RN55C1331F 81349
U1 Rectifier Assembly 1 KBL01 11711
U2 Voltage Regulator: + 15 V 1 LM340T-15 27014
U3 Voltage RegulatOr: -15 V 1 LM320T-15 27014
U4 Voltage Regulator: +5 V 1 LM340AT-5.0 27014
U5 Voltage Regulator: +8 V 1 LM317T 27014
5-41

REPLACEMENT PARTS LIST
WJ-9205
5.5.4 TYPE 796539-1 KEYBOARD DISPLAY ASSEMBLY REF DESIG PREFIX A4
QTY
REF PER MANUFACTURER'S MFR. RECM
DESIG DESCRIPTION ASSY PART NO. CODE VENDOR
Revision A
Cl Capacitor, Electrolytic, Tantalum: 1.0),lF, 10%,35 V 1 C813BFI05K 81349
C2 Capacitor, Ceramic, Disc: .0111F, 20%, 50 V 6 34453-1 14632
C3
Thru SameasC2
C7
C8' Capacitor, Geramic, Disc: .1 ),IF, 20%, 50 V 1 34475-1 14632
DSI Diode 1 HLMP-1301 28480
D82 Diode 1 HLMP-1503 28480
PI Connector, Plug 1 609-3401M 15912
Rl Resistor, Fixed, Film: 470Q, 5%,1/4 W 2 CF1/4-470 OHMSlJ 09021
R2 SameasRI
81 Switch, Marked 5 381035-1 14632
82
Thru . SameasSI
S5
86 Switch, Marked 5 381035-2 14632
87
Thru SameasS6
S10
811 Switch, Marked 1 381035-3 14632
S12 Switch, Marked 1 381035-4 14632
813 Switch, Marked 1 381035-5 14632
Ul Display, Alphanumeric 4 HPDL-2416 28480
U2
Thru SameasUI
U4
U5 Integnited Circuit 1 MM74C923N 27014
5-42

SECTION VI
SCHEMATIC DIAGRAMS

WJ-9205
+€
DGTLG~
32
,--
KEYBOARD/DISPLAY
J6
1---
24
23 ~~
21
22
13~
r4~
15~
16~
17~
18~
19~
12
~I
II
10
~~,
I~
21.L ~
3~
4~
5~
6~
33p--.+5V
34
31~
~
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
alCAPACITANCE IS IN ~F.
b) RESISTANCE IS IN OHMS t
XAI
II ~
I
I
MPUI
I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2B 29 30 3/ 32 33 34 35 36 37 3839 4041 42"43 44454647 48 49 50 51 52 53 5455 56 57 58 59 60 61 62 63 64 6566 67 68 697071 72 RAMI
ROM
I
XA2:1 I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ~~~m~.34~~~~~~.e~~~~~~~~~HnM~~g~~OO~62 63 64 65 66 67 ~ 6970 71 7 2 DATA
AQU
I
I
XA3 II 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 ~ 31 32 33 34 35 36 37 ~ 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 7 ORO
I
I
XA4 I I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 /8 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 .a~Oqn%~~~HnM5556g~~60~~63M6566U~W70n7 211/0
XA5
I
I
ItJ tJ
II 2 3 4 5 6 7 8 9 10 II ~~~~~rr~~OO~2223M25~V~~~~~33343536~~~~~e~~Oq~~~~~52 53 M 55 56 57 58 59 60 61 6263646566 67 ~ 6970 71 721R~m
+SV
OGTL
GND
\
L · _
r
ANLG
GND
IEEE/
Figure 6-1.
Type 796533-1, Motherboard Assembly (A1),
Schematic Diagram 580534 (Sheet 1 of 2) (B)
6-1

WJ-9205
~ ~ ~ ~
+ + I +
-- -- -- -- -- ---- -- -- -- ------ "13265 I 4 I
I ~ ~ j I
-- ---- ---- ---- -- -- -- ---- -- -- -----
J3
X OUT I"
Y OUT 3
X IN 5
YIN 7
~C4i·cs
0 .J
'" ~
C3f
~~r;r(~
~ iii
'" x
I- >- ::l 0 > > 9~
18' i.e > x '" 0 c x ~ x >-
r-;-, r-7~ :1'"
4 t-UJ t-UJ t--J
JI I " 12 14 13 15 16 17 18 19201 234 567 8 g 10 I
D'S I
g
DFS2
D'S 3
+15V -ISV
.!.l "
~CI
oN: 27
~
.,
.. w..
~>~j )) ~);= ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ I~ I~ I~ I~ ~ I~
*~.lDUOI£'C(!~5S00:lll:W::W: ~ ~~
XA71 7 8 9 10 II 12 I 2 5 6 3 4 19 20 13 14 15 16 17 18 I
"
_N
Q 2 ~~ I~ I~
~ l l 1 l 1 I
I,I,I~ ~ ~, ~
~ til
:;: I
~~ ¢. I
I
I
----------------------------~
68
H5V
w
z
81 GND
FAN
•
"

WJ-9205
+5V
+5V
GNO
GNO
V BATT
r-- --- --- ---
""",P/O PI
~~
~h
~C2 ..LCI
1 22 TO.I
+5V
501--------------,
i--
~
--- -
PI,-
41 5
33 Q
34 Q
37 E
38 E
VIR
R5
R/'N
NOTES:
I. UNLESS OTHERWISE SPECIFIEO:
oj RESISTANCE IS IN OHMS, *5%,1/4W.
blCAPACITANCE IS IN JlF.
2. DIFFERENCE BETWEEN TYPE NUMBERS
IS LISTED IN TABLE A.
01/00
0110 I
01102
01/03
01104
01/05
01/06
01/07
TYPE
796534-1
796534-2
UI
2764
U2
N/U
U4
NIU
TABLE A
U5 UI6
6264LP
JW I JW2 J W3 JW4 JW5 JW6 JW7
N/U N/U 2-3 1-2 N/U N/U 2-3
IRQ
FIRQ
HALT
BREQ
BS
BA
MWAIT 45
-
fP6
t A0
2
NMi AI
A2
TP7·
,
A3
37 REm A4
AS
A6
15 2 A7
A7
16 3 A8
A8
17 4 A9
A9
3
18 5 AIO
ffi AIO
4
19 6 AI<
40 FIRQ AI<
20 7 AI2
HiLT 33 AI2
iREQ 21 10 AI3
AI3
5
22
BS AI4 9 AI4
6
23 8 AIS
BA AIS
(TYP)
U9 lOOK
A0
AI
A2
A3
A4
A5
A6
A7
A8
A9
AIO
AI<
AI2
AI3
AI4
A'5
I
I
L
Figure 6-2.
Type 796534-1, Microprocessor Assembly (AlAI),
Schematic Diagram 580474 (A)
6-5

WJ-9205
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
.) RESISTANCE IS IN OHMS.±S%.1/4W.
b) CAPACITANCE IS IN pF.
14 T4HCOO
034
8
E37 ~tl=![2~:~=~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~========E===~=~~=~~~;;;~~--+-SV-+-S-V ~ 10
pJ I
RD 321--t-lf--=2:':-\-~ I 4 6 9 USC
dUI9A 3 12 II 74HC08 2 USA 3 S USB
PI
r-1
70 A/ORo
R/WR 36r
l~~++_-.~bq"r
;1S~74HC08
7
69 A/OWR
ViR 31
+sv I.J +SV
2 ""+CI4
GND ~:J....: 4.7
+15V 55 ~+ +15V
-ISV S6
1Pi0---- ------ ---- -- -- -- -- -------- -- ---- -- .-- -- -- --
ORO RAM 491--t-l-.:"!-~ 1~'4 05 UII ~ 4
~SV
2
DE CS. II 2 E OIR 18 oil 12 0 SO.!.. ~ U7 06 -"---"-4 3 01 ~I Y6b,L- 1'8 7 06 ...-.E. 0 S 0 9 2 0 S 0 S
4 14 Ojl~AI Ol~ VI OT~OZ f-!, -
6 +SV 01~A. OZ~ +SV~ U48!.. -V; I 084--J 03 '1/ 6 I -':L-I V, v~ U~O,~ U1° ~+SV
C
74::;;B I: UI3 1 ;77 :: WE !~~~~UI7mi:i, C\:~ ,t
r'l
RST
'iil"---a 12 no' +SV I - rOT OE7AZ""- .03 +SV
~ 7 06~AT OT~ I
~U190 II I OTI 19 C23 9 A8 88~ I
E 38r--t1H--.-.-------~r_--------I------+-------....!.!10~CK OZ 7 2 8 YI~rl---""4'-l~ 0:, S
I
1 f~~
2
2
ISV
+SV~
II-
+5V... ..!.!
+SV
d 74HC74
,.g 0 S Qr2
ur h
..!! CK Q~ V,
~
RIS
1.3K
C7
I~~fl
74HCOO '2
13 U50~1I,-----------~
~~Irli~~:U6~~~ 5 I l+s/1-=-0'C:91IO ..!!.CKRI:~74HC~*~6......~--J
57 DUMP
{HOLD
58 AOR INCR
CLK OAC
,..-- 13 Olll
,---11 01
,..--9 02
,---7 03
-,--- 14 04
,...--, 12 OS
,..-- 10 06
.r-- 8 07
r- 29 AIlI
lr- 27 AI
lr- 25 A2
r-- 23 A3
21 A4
'-- 19 AS
'-- 17 A6
'--IS A7
'-- 30 AS
'-- 28 A9
74HCI38 ,A3 3 r---~,.IL
- C Y,t"OA '-- 26 AIO
~8 YI~ '-- 24 All
TL074 ~A Y.~ '-- 22 AI2
+SV~
Y31>!.!i'2~_-, I'-- 20 AI3
U14 Y4!>H;---, I'-- 18 AI4
9 +SV.-f CSI YS~ I '--16 AIS
U22C 8 rCS3 Y6l'h I L+-----l59 RST OA
10 + CSZ GHO~ 1'--+-----168 WR OA PAGE
71 ViR SPAN
'17 UI8 .~~O rt"---------,..-----·-+ti-------------+--.....:..:.:....====--------..J
....·WR(22-4) VI 6~~4
4-rr+:s:v==flF===========1~~~~=;j~i~===============t=======3=======!:~
'LPI2 All!£.-...., AI.2....-...-
AZ.!.--.....I ~
A3~ ~Oll ""~
:;c '%H- OI "I~
A6 4 , ~O. "Z~ .03
~ 03 !='--..-++++5V
AT+':---- ~ DO U20 C21T
A8~ ~ 05 lil~ -1'~
A9~ _----J ~06 ..v,
AID~ -..!lL.!!. OT .!£, I
All-¥--'
~ VI
CSI AIZ~ 74HC374 I" I
C20 +SV
A ~J~~ +5V ~20 ~l~ 74HC374
,..- -1-.--J V J 20 I 7 1
13~ 16
,~AIO FD6K~-t ....-----
'
~ 74HC244 ~olf QfIIf..'2=- 1 _.!-'II~:: ,gb~F
+I;V RI4
RI3
18 T 10K
CK 11j2~~ +sv ~ 01 01 ~ 10 A7 OUTII-'I_-4-,2~~""I::""
12,IK
1% 16_ _ I4
1%
I 17 ~~ I 4 AZ 120VI t ~ 03 8 00·3 °oZ 9 : A6 U21A I
14 05 6 A3 U3 J A5
7
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8 5 II ~ ,-os 14 05 05 15 6 H," TL074
O3 U9 01 81 Y81c~ All., l' ,--= A3 GNO S
~ D. Oil 2 13 82 Y8.~ ~ 06 06 16 SA. RZ8 .--+----....:.j,,'!;+.;.-1-111 TL074
14
~ 01 ~ 83 Y83~ CI7 ~ 07 OT 19 4 AI v+Ft: 2~.:e...+15V ..
~ O~ !£, ..!! 84 Y84~ CK UI6 REF IN + -ISV
DE . ,V ~8 .03 II 10 OACI022 ~ l' C24
J
~
2 Wll(PI-31)_+-_~"':4!J I '--+-----1
+ISV
t
......T
2 _~
I1RI7
470
RI6 I:Z2A
4.7K 31'
c6T,;!;-!" TL074
1001 -15V
pF
2
CIl
'0'2
~:~ 2 A~A ~:I~ 006 GND' 10 IN~:~9 130K O~
OT 4 4 A. YA2~ ~ 08T .:8 19 :f "V +5V (0: 02 2 - 8 RI9
'0 UI 06H'2--..:j6;.lA3 YA3~ All 6 WR 8 CI2 +SV ?vr-w......-4~ 2N3906. +.U23A I 2.2K
"";:"CK
0",5*-:~5:-_';'18:-l1A 4 YY8A411~ ~;~J'-=-------,~~IS~~C O~ 20~} 13 TL074 RII 4 T4HC74 4 2 1'6'1< ~
•. 8 1 ~ RI R2 VAA VII8 ~ 10K R3 1% c.l V 1 4 TL082
03 6 13 ~Z Y8Z~ 470 tK I -vfii
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I 1'0', ,...! O. 01 9 IS 17 83 84 Y83~ Y64~ -ISV· 'lcl .~C2 ~U24 12 + RI2 U4A U -ISV
A 27 R4 01 R21
L......!!.ST U2 10K 3 10K 2N3904 2 10K
74HC374 I J T I . 19 I 'S *_ 18
I L..~':'::"'__+_-+_---J ~r;;RFB 3 2 ~~6 INr--U:..:,B--'OUT
~ 081 A rvSI t +ISV.....-~.J;~'i._7~8~L~I~2-t-=~!Ir--=:-1r-...,---------....,
74HC4040 ~ '- 02 12 22pF + I + R5 L R7 R9
~ IS ~:; OUT 2 I 9 TL074 t,a f~14'~7.K SOK 22.IK
+SV 011 14 rl A 117~ J~ 10% +ISV t%
.fu 010~ ~ 19 ~ ~:: ,-+5V U21C 8 2 R8·t
.--- 1
"iI" 74HC244 1,0 20 /1"': -1 4 . 7 ~ 1.0 . 3 :~~ 2 2 1% gRii~ ,2.. C • o~ 2 2 +15V ....._ ......+'''1-''-
+5~ V 2 2 LM336Z-S I I ~6~
47 IOE 1
~
C9
IOOOpf I 6~ 1
/I - :~g
P~
RI8 U22B~7"" ;';"'+-----

WJ-9205
IIIOTU:
I. UIILlIl OT.....II( SI'lCIFI£O
oj lIQ..,.allC€ I' III_.± "".lIlOW.
., CAMCITANCE IS III IIF.
P/O
f-,P1
5
10E' 4
A6 17
6
A7 15
A5 19
A4 21
A' n
9_
10
IIu3C
74HC02
+i5V -MV +5V
~
2
I
~J
~n"~'
U78
II 02 8
R6 117 III ~ 74HC74
10K 22.IK 2K 13
8EEPEIl
SPAIlE LAMP
REM'LAMP
Ci:'61f
CUE
~
el
WIl
BLANK
K06
K05
K04
1

WJ-9205
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
0) RESISTANCE IS IN OHMS.±S%,1/4W.
A bl CAPACITANCE IS IN ~F.
illU7,UIO-UI5,CIO,CIl. YI NOT USEDON 796538-1.
& R I OCCUPIES SAME HOLES AS CIO FOR 796538-1.
A4
AS
A6
+l5V
+SI/
o GND
-151/
,---
C5
0.1
C'4
0'
U3
+51/~~ +51/~E-i UI +5V
PI 74HCTl38 74HC32
15
r----
I
All
9
21
YI
2
+5V
19 A/ Y2
3 f? ~8
R2
C4
~
CSI Y4 pJ.~
9 RD
L
CI~..L+' ~2
2.21'
_
CIS
01
~
U14&'
-12V~ LM79MI2AHC
~2
-I
PIO
U8 pPD721Q 481137-1 20 J I
8 35 12
-
9
Y~ CS 0108 08
8
14
7 ii""'" 34 13 07 :~ 8
DACK
6
i3i06 33 14 06 86 7
4
17 A2 Y3 p.!.,2 47K ORo 0105 32 15 05 85 6 2
31
+5V+---f
0104 16 04 84 5
7
38 CS2
4
Y5 pl.,? +5V::pt;
RST 0103
30 17 03 83 4
4 0" 12
5
48 CSll Y6 ~ 14
Dll 0102 29 13 28
:: 02 B2 ~
3
45 13 74HC32 01
01 iffij"j I
02 14 5 II ~~ BI 10
~U9D 02 olojil
CRI~. ~
IN4449 2 U9A 3
8 03 15
--Ti h
04 16
I
4 }'~4HC32
03
~ 74HC32
04 I
05 17 T/RI 05
U4
41 6 06 18 06
----l!- 481137-2
5 U9B 07 19
32
07 SRQ
27 12 SRDTESRD 9 19
21
+5V~ C6~ RSO AfN
26
13 ATN ATN 8 21
-E 0.1
22 RSI EOI
39
14 EOI EOI 7
US I I 19
9
23
55 +ISV
lOOK 10 EA EB 20 T RS2 OAI/
36
SI
IS DAV OAV 6 II
+SI/
II 37
INT NFRO 16 NFRO NFR S
TYP V; U6
13
8"-
De --!g WR NDAc
38
9 2 2 AI YAI 18
'7 NOAC NOAC 4 IS
~h
+SV '6'1""
II 4 4 A2 YA2 16 01 ~ ClK m 24 18 IFC IFC 3 17
+ C2 + ....g 4 13 6 6 A3 YA3 14 02 REN 25 19 REN REN 2 10
"22 ;- 3'"
14 7 8 A4 YA4 12 03 T/R2~PE ~
'--
4 "1:0-
3 B 4
16 9 II B' VBI 9 04
+
3~
~20 CI6 20
,.
2'" 15 8 13 82 Y82 7 05
"
4.7
C I
5""" CI3 U2 P +SV
12 5 15 83 Y83 5 06 0.1 74HC04 0.1
56 15V r:r""" '-"'" /0 3 17 84 Y84 3 07
+5V~~
C~i
'--
~
o PIO
64 f-SERINT
26 ~ +5V
'----74HCT244
J2
63
L..!l. CE SCN2661 0.1 ~
Ell r---
3/ 19 I 2 7
hO
37
"'> 3
6
oil 27
13
23
7
6
28 ~ RTS
- 13
01
II
.> 5
12
02
9
1 .& 02 24 9 10
23
03
7
20320TR
11
22
04
SER
14
5 04 UIO INT &IS
~ 14
05 36
6 05 UI3 '"
13
12
37
06
10
~ 06 TIEMT ~
SN75172
07
8
~ 12 8
SER INT
IEEE INT
WR
SEND DATA
E
oil
0/
02
TERM INAL READY
03
04
05
06
07
Ail 29 12 ~~ ;::~~ ..!..1. CI8 ~2
AI 27
10 AI
R3
A2 25 47K
~ ~ +SV
13 R/W 16 4
R/W
21 RST 36~U2 3 +SV 3 2 11
74HC04 I 2 +12V -12V
RIO
I
10
RST 5 A C7 C8 &
25
17
6
f--' U2 2.2
BKOET
2.2
5 17
RI CTS
7
74HC04
16
1M
P
22
10
PIO 14 I ~
II
21
U2
OSR 9
DATA MODE
I-- J2
20
74HC04
20
8RClK
.r- ~~8
oCo l6 13 14
3 2
25
TRANSMITED DATA 3
15
RECEII/ER READY
EI E2
'----' .& U2
24
6 1£.& 0
1---+ 5V 2 74HC04
E6
~
7 ~- 2 ~I)'='
~4
UII &
~
REQUEST TO SEND
E5 12 8 SN75172 2
~
9
8
~ CIO.., YI CII
DATA TERMINAL READY 14
30PF14.9152 T30PF
:~-+SV
E7
.& U7 UIS II
I
~
~--- MHz & +51/
SIGNAL GND 13 ~ 2 SN7S189
K ILl 1 CI2
SN7S188 -
RS232C
5~
H~·I
RECEII/ED DATA '-3
~
1& ~141~
7 E3 E4 4 6
OPTIONLCLEAR TO SEND 9
F~
v 7 U2 I
10 8
DATA SET READY II
~ 74HC04
v
RECEII/ED LINE
13 II
SIGNAL DET
IS
v
-
I
U12&'
'---
+151/......l.J LM78MI2HC ~+121/
w.--..-15V
, J.,C20
+l2.2
I
I
~
08
07
06
05
04
03
02
01
SRQ
ATN
EOI
DAI/
NFRD
NDAC
IFC
REN
IEEE 488
OPTION
REQUEST TO SEND
SEND COMMON
SIGNAL GND
RECEIVE COMMON
RS-449
OPTION
RECEIVE DATAJ
CLEAR TO SEND
Figure 6-6.
Type 196538-1, Remote Interface Board (AlAS),
Schematic Diagram 580560 (B)
6-13

WJ-9205
NOTES
I. UNLESS OTHERWISE SPECIFIED:
a) CAPACITANCE IS IN pF.
r
+8V
L r
-15V L
r
+15V L
IN3
r
GND
l
3 U C2 1-,..,....- E9 I
4 E3 1000 ~
~ t-~""'-----------4""--+-E

E8
Rl
11 1_ 2111I 4111I
-1$V E4 Ell E2
E8 ~.
-1$V
11
IN 3
E7
l+cl WJ-9205
lO'JlF
~
R6 ~13 I1c22
111<
l'°IJlF
& +Ul-D
A22 ~ RI!3 R24
111<
111< 111<
1C3413
2 t'- 4 LS
R3
1.11
III
'11
f--"- +
18
lU
111< is IC16
lC2
lULF
lULF
nC37
h C38 h C39
'fiF
~+ SV
12y
l-....!: _
~+
11 3t? 4
~
s~:
2 r::-- 8 1'C14S8N
~
L.......-...!._
~HS8N
4 7
1: : lJ2-C 8
SV
/~1C24
L8
l [~ L1I L11
L9 IULF
LSi!
lULF 18
IS 18
l ~ IlllF
lC23 l l lC26 lC27 C28
lULF
L13 lULF
( IS 111LF 4.7Ul
~
•• 7Ul
1
C29
CR13
CR14
~
CR1S cal CR17
~
... ..... -
.ULF
R39 RU OUS CR.S R44 R+6
-
i!7 i!7 39 39
. RU R+S
39 R42 R43 11
2.71< , 2.71<
cal
C32
lULF ~ ~
l ULF
=
R47
2.71<
R48
2.71<
R49 RS1 RS3 CR24
-
39 82 39
RSI RS2 RS4
11 11 2. 71<
C34
lllLF
C3S
lULF
.,J:.-
lll1TPI1T
Figure 6-8.
Type 796500-1, Input Selector/Step AtterlUator Assembly (A1A7A1),
Schematic Diagram 480755 (C)
6-17

WJ-9205
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
a) RESISTANCE IS IN OHMS ±. 5%, 1/4 W
b) CAPACITANCE IS IN }IF
c) INDUCTANCE IS IN pH
+15V
I R5
E3 10
~CII 1'4.7
C6
EI .01
IN ~t--4I~-- ..
L5
47
C7
.Ot
RI ~
47
C9.01
R3
1.2 K
R4
1.2K
CIO
.01
R6 CI2
47 .01
~ LI L2 L3 L4
TI .487 .464 .464 .487
E2
1
OUT
L
Figure 6-9".Type 196544-1, Input Filter Assembly (A1A1 A2)
Schematic Diagram 381196 ('A)
6-19

WJ-9205
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
0) CAPACITANCE IS IN pF.
b) INDUCTANCE IS IN JJH.
2. FEEDTHRU CAPACITORS CI-CI8
ARE 1750pF
II
I I
SELECTED
RF INPUT
l-yjl- --- --- --- --- --- --- T
E6
I
--- --- --- --- --- I
I
--- --- I
--- ---
SECOND LOI
SECOND IFI
SECOND CONV
10kHz RBW
FIRST LOI FIRST CONVI AUTO CENTER
TYPE 796541-1 TYPE 796542-1
TYPE 796540 - I
REF DESIG PREFIX AI L5 L7 L6 L4 REF DESIG REF DESIG
SCHEM 580511 .L 0.47 0.8,,10 2.2 0.8-10 2.2 0.8-10 ~..l PREFIX A2 I PREFIX A3
E7 ~- ~
EISCHEM E4 EISCHEM E4 r--
T C ;:;::;: C24 C ~C23 C 380992
;::;::;:C22 T I E5480881
;: r--
E9 EIO Ell EI2 EI3EI4EI5 EI6 E2 E3 E8 E I E4 E5 21 ,Ii 15
20 10 19 ~ 15 E2 E3 E2 E3
I~ I ~ )~ "- ;; ~ 4r-
C C C C G C C C C C C C C C
L3 3 L2 LI ~
I 2 3 4 5 6 7 8 9 10 II 12 13 14 )
0.178 ~ 0.178
0. l
p: p; 178 P: P: Br: ~ P: r: p, P: ) \ P: P: -L -<
I
I
I
I
~
I
~
~ ---< ~ ....-
L B -L p B C15 CI6 --L ~
-
I
p:
CI8
--- --- --- -

WJ-9205
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
0) RESISTANCE IS IN OHMS,±5%,1I4W; I'll. ARE I/IOW.
!I) CAPACITANCE IS IN pF.
c) INDUCTANCE IS IN pH.
I
I
~
EI VI Vo 2
CRI,IN400S
+ ISV o--.....__.........,.VY'''-4~ +V CL
UI
l r
~~
R2
I
I
I
I
I
I
I
I-';C4S
I
I
I
I E2
~~~O
R8
27K
S ~Z~· lNV 4
CRS
KV3901
7
+12V
R7
27K
CR8 RI2 RII R9
IN4449 '3
ii K 7.5K II.OK
t-411J--......._+-~I%!- .... 1%
CR9
IN4449
R'S
S.62K
1%
1%
R35
4.75k
C7
! 2200pF
CR7
IN4449
RI4
3.83K
1%
MC34002P
I
L __
6 MCI723 3
VREF Cs
2.7K
C2 +
R34 18 l
22
+J 18
-ISVI~2-ISV
SWEEP IN
+12V
CR6
IN4449
RIO
~+12V
R3 +.J... C3
2.7 l' 18
R4 ~
S.IIK
1%
RS
7.5K
'-I.
+12V
R6
C4 10
~OO
L2
pF 1.2
CS
470pF
+12V -ISV
11.5K
1% R42 R43
470 470
~4+ C3~
18 18
I 4
v+ V-
R41
47.5K UI2
1/.~:..+__...__~5 OUT IN 3
-15V
1% LF398 7
LOG
Cb REF
6 8
C35
.22 T
C33
18
+
R45
909
-15V__.......o---...;3::+...+:..,
+SV
£12 EI5 EIO EI6
__E_II ~ ~EI_4__
R48
TPI I K
PFT
CIO
27
-15V
R50
470K
C40
470
pF
r
C44
47pF
R20
IK
SP8690
UISA
74HC74
R21
10K
2 PE I c 16
vEE
12
+SV
+5V
+ CI8
R22 1'18
470 ~
~
R26
47K
C24
JIOOO
pF
+SV
+5V
+8V
E5
UI78
74HC74
UIS8
74HC74
10
12 0 S Q 9
" C Q 8
RST
13
+8V
RF
IN
E6
R2S
R32
100 18
R38
100
+SV
UI6
74HC04
3
+SV
E8
LOCKI HOLD
+5V
L4
47
TI 4
T2-1
6
+SV
74HC32
12
1\
UI4D 13
~
-----,
R31 R33
300 300
f4H(131
+ev
74HC04
UI6
~
UI6
~
+ISV
74HCI32
~
~UI8~
I
0.1 I
~
4 E7IIFOUT
.P--'Y.,."..-...~ ..:S:..r-"'" f 41 .'l(K
R46
27K
4
UI88 0:6'-- --0 :>f TECT
------------~
I
I
I
I
I
I
Figure 6-11.
Type 796540-1, First LO/First Converter/Auto Centering Assembly
(A1A8A1), Schematic Diagram 580511 (C)
6-23

WJ-9205
r--
+15V
E2
+SV
E3
-------------------
--,
INPUT
I C2 RI
4.7jJF 47
I P+
I
I P
I
I
I
I
I
R2
C3
1000 10
C6
I ~ 100
I
lEI
I
I
L
01
U-310
CIO
4.7)JF
c-1+
'V CII
1000
r
R7
6S
RS
10
CI2
1000
IIG~o
2
2
CI4
4.7 jJF
~+
CI5
1000
~
R9
47
L2 L3 ZI R5
0.1 0.1 18
CI6
1000
RIO
47
CI7
1000
RII
10
RI2
10
II
SALANCED
RI4
6
MIXER
IS
U4
S TAK- 3H
RI3 RI5
300 300 7 2
WI
1-=-t...-o,.p'l--~r_O_E_

WJ-9205
NOTES:
I. UNLESS OTHE.RWISE SPe:CIFIEO:
a) RESISTA.NCE IS IN OHMS. ±5%. 1/4W.
tJ) CAPACITANCE IS IN jlF.
e) INDUCTANCE IS IN jlH.
PRE- FI L T'ER
10.7·MHz IF
L
C3
0.1
P
R9
18
R7
300
VR'
IN746
RI
390
R8
300
E5
PRE-FILTER
10.7MHz IF
R5
4.7K
R6
470
+8V
E3
C8
0.1
P
R2
"56
CIO
0.1
P
R3
56
CIS
0.1
r
R4 C2
390 To.1
I
-----------------~
L9
15
CR2
I
I
I
I
I
POST FILTER
10.7 MHz IF
Figure 6-13.
Type 796542-1, Second IF/RBW (10 kHz) Assem~ly (AIA8A3)
Schematic Diagram 480881 ( A)
6-27

WJ-9205
-15V
+15V
+8V
L
P2
EIO
Ell
L~_I--:-:;:>~~~>-t.?:"t------, RI PA RT 381939 -I I
E4 4.7 RIO REF DES IG PREFIX AI
PI
RBW0 7
ACK0 8
RBWI 9
ACK I 10
RBW3 II
ACK3 12
RBW4 13
ACK4 14
RBW5 15
ACK5 16
RBW6 17
ACK6 18
PRE FILTER I
10.7 I F IN 2
RBW7 19
ACK7 20
3
ANALOG 4
GND 5
6
8
N/U
E3
E4
E5
E6
E7
E8
EI
rCI
r------------------------.-~
E5
E6 SECONDIF/2kHzRBW(OPT) I
E2
C6
.01
~
R3
IK
RII
150
R2 + R5 10K I
2.2K R4 J4 C 7' 4.7 C4
.-_-+--2'v\2,....0-,K . C2 l---. I
RI8
18
5082- R8
3188 300
C8
.01
P
MWA220
RI2
130
BACKING PLATE PART 381941-1
~ I.~ '"
R6 R7 .01 I
6 330 330 R9
RI3
30
RI6
180
+--tv
LL------~--------
2~i219A 4.7 I
CIO
l' 0.1
MWAl20
CI2
.01
P
RI7
39
-----------:J
I
I
I
I
I
I
I
I
I
E2
PIO
P2
POST FILTER
10.7 IF OUT
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
a)RESISTANCE IS IN OHMS,:i:5%,1/4W.
b)CAPACITANCE IS IN jJF.
c) INDUCTANCE IS IN JJH.
Figure 6-14. Type 796790-1, Second IF/2kHz RBW Assembly (A1A9),
Schematic Diagram 481466 (B)
6-29

WJ-9205
r
PI
r---
---------11
LOG VIDEO { 2 C7 ~
GND
I ...-....---------t-~~_tE7
1000 T
GND{ ~ pF
5 ...-....----- ~-+-'O_::~_tE5
+15V SUPPLY { 6 C5
IOOOpF
7 J-....-----~~-+-.O_:=_O_tE4
-15V SUPPLY { 8 C4
1000pF
9 ...-....-----~::__.-....o()_o~_tE3
+8V SUPPLY { 10 C3
1000pF---.....
19 ~....-

WJ-9205
,----
I
I
+15'1
R3
100
R47
10
I 01
IFINPUT
I ~LI_JY"I,"",-AJ'""",,",--_...L ~....D-+__• C5
r'"
I
I
CRI
-15V IN4449
8LANKING E02=-- -I...- ---1~-------------JW'¥-----.-.,
R32
E3
51K
+ 7.5'1 SUPPLY
~9
.01
:020S-----H~~--=....:::.j
CI U310 CW
+15'1 SUPPLYIOE_5 ......._. +15'1 +J ~~78
7
+J ~~i 02
L- :.-.-,;12~V+ V- V
II 0
2N2102
~ 6~
-15V SUPPLYI0----,---15'1 vR CL1-=---....---.
J.., C37 R43 UIO R45
R25
100
R5
II<
R28
181'---il:~~ I
-------------~
I
I
E71 Y OUTPUT
E81 EXT Y
I
I
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
0) RESISTANCE IS IN OHMS, ±5"1o,1I4W.
b) CAPACITANCE IS IN pF.
c) INDUCTANCE IS IN pH.
2.0WG IS SHOWN FOR 796506-1.
FOR 796506-2 OMIT R42.
Figure 6-16.
Type 796506-2, LOG IF/Detector Assembly (A1AIOAl),
Schematic Diagram 580454 (C)
6-33

WJ-9205
+15V
+15V
GND
GND
-15V
-15V
+15V
+15V
GND
GND
-15V
-15V
HV SAMPLE
DRD-X
X - IN
X-OUT
V-OUT
DRD-V
Y-IN
X-V ENBL
AIPI
..........
HIGH VOLT
PWR SUPPLY/
DEFLECTION
AMPLIFIER
TYPE 796545-1
REF DESIG
PREFIX AI
SCHEM 580528
FOCUS
INTENSITY
ASTIG
AIP:I
I
2
GRAY
II
EIO
8 04
VIO
12 E9
7 03
WHTIBlK
5 E7
10 02
WHT/BRN
6 E8
II 01
WHT
3 E6
9 A2 VI
GRN
4 E5
5 AI 481445-1
REO
9 E4
2 K ( CRT)
WHT IYEl
10 EI
14 H
BRN
7 E2
1 H
ORN
8 E3
3 G
13
15 .....T JI
17
"'-
19
20
16
18
14
/
L..-.--
Figure 6-17.
Type 796782-1, High Voltage Power Supply/Video (A2),
Schematic Diagram 381891 (A)
6-35

WJ-9205
NOTES='
I. UNLESS OTHERWISE SPECifiED:
0) QAPACI lANCE 1$ IN IJF.
b) RESISTANCE IS IN OHMS.~5%.1/4W;
VARIABLES ARE ±10%.1I2W.
rE!.
+ 15v 1
.. 15v 2
·)N(, ..
GNO •2
,~v S
. IS" 8
.. ISV 3
+ 15V 4
I
I
~=tt==::~I:::::::l~~+--+ I~V( 8)
CI
18
I
-1511(8)
I
~=qf==+~=lL.---,..._ + ISVIA)
+ RI
;"?~ I.SK
~f----+ID +SVIA)
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GND 'ol-.......,H--f---.....-t--+--J
I ADJr.~ U'
V
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I
A
+ F--- -5VIAI
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- 15V 7 f--t--f---+-o---, 18 1.5K
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R47
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I '3~I - - I'. 6 IHORII GAIN I 1
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I
_,::::=:,- CW 2.7K "'OW r:-=:o 20K 10K T\.082
I __t-:I-_+-o- .....l~~ .t·~-:;,N"'-~"ni~I---- -t,-;--'G-t,-;--' S +
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R40 10K HORIZ
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os
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R27
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R28
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~ R20 R29
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....- -+- --

WJ-9205
Ui
9
Cl
P1
.81
8 S +lSV
C7 +
.81 C12
7 J4.7
CR1
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C9
6880
L2
VK200-10-38
3
E1
C2
4.7 + ~
L3
VK288-18-38
1 3
6
+
5 C3
J4.7
i
-1SV
3 +SV
4 US
L4
VK200-10-38
MR851
2
J1 4 +8V
E4
1 R1
E2
+ 243
2 AGND
C4 R2
E6
1.33K 6 DGND
L
~4.7
NOTES'
1. UNLESS OTHERWISE SPECIFIED'
A) RESISTANCE IS IN OHMS, :t: 1", 1/18W.
B) CAPACITANCE IS IN ~F.
Figure 6-19.
Type 796771-1, Power Supply (A3),
Schematic Diagram 381840 (A)
6-39

WJ-9205
DATA IN
{
8LANK
CLEAR
CUE
CURSR
K00
KOI
K02
K03
K06
K05
K04
PI
,......,
20
25
24
23
21
1-
I
I
13
I
14
15
16
19
18
17
I
I
I
I
L
.gT
+5V
.g~ +5V +SV
117 lis lis 114 113 il2 III Is is 14 13 hal *.gi
17 16 15 14 13 12 II 15 4 13 181" t 17 16 15 14 13 12 II 6 S 4 3 18 Lt 117 liS h~ 14 113 112 II 6 Is 4 13 118
04 os 06 03 02 01 Of) Wli CUR CUE CLR 8L \\:e 04 os os 03 02 01 D0 iWl em CUE a::R 8L vee 04 I)S 06 03 02 01 D0 WR CUR CUE CLR ilL \\:e 04 05 06 03 02 01 00 WR CUR CUE CLR 8L vee
U4 U3 U2 UI
HPDL -2416 HPOL-2416 HPOL-2416 HPOL- 2416
CE2CEI AI A0 GNO CE2 CEi AI A0 GNO CE2 CEI AI A0 GNO CE2 CEI AI A0 GNO
2 I 7 8
2 I 7 8 • 2
?o
I 7 8
~u 2 I 7 8 ~O
~l
CE 22
DISP4 12
DISP3 II
DISP2 10
OISPI 9
KAI 8
KA0 7
I 051
+5V
RI , HLMP-1301
470
26
I ,~ +SV
~~6
(REDI'C/ ~02) ~(01l
I DS2
2O~
R2 ..... HLMP-ISOI
Vee
I
470
SPARE LAMP 27 ,~ +SV
I....--.-1l X3
A 19
"
1 II
28f-NC
I
CGRN? X2 B
'8
~06) ~05) 1~04) 12
BEEPER
XI C 17
SPARE
I YI U5
29r-NCI
2 74C923N D~
SPARE 30l-NC
" "
Y2 E
3 Y3
+ 5V SUPPLY 33 +5V
4 Y4 DA 13
~0A) ~09) ~08)
34
5 Y5 m:~
GND
Ifc, esc K8M GNO
1.0
"- "-
I
! J JO
31~ ~El ~0DI SI1C0Cl C7 C8
.:: I~
"- "-
~Ol
~O.l
I
+5V
~
CS
.01
I
I
I
I
I
I
I
I
I
I
I
PIO
PI
-r-""1~
n~" M
--+--,6 DATA AVAL
I
I
J
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
0) RESISTANCE IS IN OHMS., :I:5%,1/4W.
b) CAPACITANCE IS IN ~F
Figure 6-20.
Type 796539-1,Keyboard Display (A4),
Schematic Diagram 580502 (A)
6-41

WJ-9205
SI
-Lo-
I POWER I
3/4A
FI (115'0') WHT TI RED f- &
3/8A -< i~ 9 3
FlI (230'0') S2 1 I RED REF
" 8 DESIG
L
I T 2 1 IWHT
~ I PRE-
L FL- ......~3BlK RED 7 FIX
J I
~LPtm 6 I GRAY:
I FOCUS
IINTENSITY
I ASTIG
r
HIGH VOLT
PWR SUPPLY
/'o'IDEO
TYPE
796782 -I
REF DESIG
PREFIX A2
SCHEM
381891
(CRT)
~FAN !P2(D
Y '-1 +15V
~ -15V
A2-
AIPI
J4
6 A3 A~":2
N FLI 5 i~ E6 I-- 6 DGND
POWER
INPUT
115/230VAC
50-400Hz
IEFI 4 ~ ~~/WHT 5 E4 I-- 4 +8'0'
4 E5 I-- 5 +15V
8RN ;;7 0RN f- £1 I-- I -15V
P3 J I E3 I-- 3 +5V
E2 - 2 AGND
I-
JI
~
1---1 I +15'0'
2 +15'0'
3 +15'0'
4 +15'0'
5 -15'0'
6 -15'0'
7 -15V
8 -15'0'
9 GND
10 GND
II GND
12 GND
13 H'o' SAMPLE
14 X-V ENABLE
15 DRD-X
16 DRD-Y
17 X IN
18 YIN
19 X OUT
1----1 ,2C Y OUT
l-
PI
CPU/ROM/RAM
TYPE 796534-1
REF OESIG PREFIX AlAI
SCHEM 580474
XAI1L.- ----l (NOTE 2-TYP)
DATA ACQUISITION
TYPE 796535-1
REF DESIG PREFIX AIA2
PI SCHEM 580508 P2
XA2 1L.- ...J1A 1L-. .....1B
ORO/TIMING CONTROLLER
TYPE 796536':'1
REF DESIG PREFIX AIA3
PI SCHEM 580521 P2
XA3 lL.- ...JT A 1~ ......1B
PI
I/O BOARD
TYPE 796537-1
REF DESIG PREFIX AIA4
SCHEM 580551
P2
XA4 1 TA l~ .....' B
9205/488 OPT_IO~N __
RE~TE INTERFACE ­
I TYPE 796538- I
REF DESIG PREFIX AIA5 (488-AI)
~
r---? _
PI SCHEM 580560 (OI>TION SEll
J2
C---'
IF IN I
AIA7JI
'-/
IF IN 2 IF IN 3
AIA7J2 AIA7J3
"J "J
INPUT CONTROL ASSY
TYPE 796561-1
REF DESIG PREFIX AIA7
PI SCHEM 381158
X A 7 '-- ---1
FREQ CONVERTER/SWEEP
TYPE 796562-1
REE DESIG PREFIX AIA8
SCHEM 480970
)
...._--------------~
~
Q.
~
a a > >
~
z z on on
~ (!) (!)
+ +
J5 r I 2 3 456 7 8 9 101112 13141516171819202122232425262728313233341
PI
-
P2
XA8 I~_---..... A L------JB
12KHz RESOLUTION BANOWI~/SECONO IF I
(OPTION)
TYPE 796790-1 I
I REF DESIG PREFIX AIA9 J
P I SCHEM 481466 P2
XA9C---J A
PI
LOG IF AMPLI DETECTOR ASSY
TYPE 796577-1
REF DESIG PREFIX AIAIO
SCHEM 381088
_
--l'
C=-=:J B
J3 PI J
...... ......
X OUT I I X OUT
~ 2
YOUT 3 3 Y OUT
...- 4
X IN 5 5 X IN
...- 6
Y IN 7 7 Y IN
...- 8
DFS I 9 ;;1, L...
! S_C_H_E_M_ ~ 0534 .-J
488- WI
~ --. J 2
DFS 2 II ~ CI :-
RCVR
DFS 3 13 I-- INTERFACE I
fr--:
-
IFL2 I J 3
f-r-:
C2
.-
IC3
L-.
I J 4
~
XA10 IL-.
MOTHER BOARD ~
-]=88PI TYPE 796533-1
JI - REF DESIG_P_R_E_F_I_X_A_I_+_ r-
XA5 --.J ~ \ l
'------------------+------1
A4PI
4 moo ~ ~ ~ ~1~1~lili ~ ~ ~ § ~ ~ eI~I~I~ Ii ~ I~I~I~
RCVR
INTERFACE 2
6 RCVR
fm~ INTERFACE 3
L-I
L...
lEEE-488-JI
(OPTION)
RS-232C
(OPTION)
RS-449
(OPTION)
DE1!AIL
A
(115'0')
TOP TOP
6
~~
I, I
REAR FRONT
VIEW VIEW
(230'0')
: :~: :
NOTES:
L c::J DENOTES FRONT PANEL CONTROL.
2,PINS/FUNCTIONS OF MODULES AlAI THRU AIAIO
ARE TO BE FOUND WITH EACH MODULE'S SCHEM.
& A3 MODULE: POWER SUPPLY
TYPE 796771-1
SCHEM 381840
4. PIN ARRANGEMENT IS SHOWN IN DETAIL A.
KEYBOARD DISPLAY
TYPE 796539- I
REF OESIG PREFIX A4
SCHEM 5B0502
Figure 6-21.
Type 9205 Signal Monitor, Main Chassis
Schematic Diagram 480791 (A)
6-43