Daito 9F-7R5F Technical Service Data - MuleSlow Services

SOLID STATE
DIGITAL CLOCK
AM/FM RADIO
MODEL 9F-7R5F
TECHNICAL SERVICE DATA
Back cabinet (20220010612)
Back plate for clock (25429084804)
Digital clock (06420035391)
Time and alarm
setting indicator
Clock knob for time set
(25660084806)
Escutcheon (21113010611)
Transparent plate (22000022007)
Dial pointer (40140081871)
Dial scale (22132035648)
A. C. cord
(05412041257)
Switch knob for FM and
AM selector (04514033784)
Knob ass'y for VR and Tunig
(27111083394)
Clock knob for Auto ON OFF SW (25660084805)
GENERAL DESCRIPTION
The circuit used in this two band digital clock radio incorporates 10 transistors, 6 diodes and 1 thermistor.
A ferrite bar antenna feeds the AM signal to the AM converter, 2 IF amplifiers and a diode detector. FM wire
antenna feeds the FM signal to the FM RF amplifier, FM converter, 3 IF amplifiers and FM detector (2 diodes.)
The audio signal passes through a 4 transistor audio amplifier circuit. AFC circuits are provided on the FM section
of this radio for stable operation
The clock for the Model 9F-7R5F utilizes a 24-hour drum type digital mechanism. The time set switch together
with the alarm set switch turn on the radio at a pre-set time. A neon lamp is used to illuminate the clock face.
SPECIFICATION
AM
FM
Tuning Range 520~1680 KHz 87~109 MHz
Intermediate Frequency 455 KHz 10.7 MHz
Sensitivity (600 KHz), (1000 KHz), (1400 KHz), (90 MHz), (98 MHz), (106 MHz),
Maximum Sensitivity 52 db 52 db 52 db 24 db 24 db 24 db
Quieting Sensitivity (60 db) (60 db) (60 db)
(29 db) (29 db) (29 db)
(AM band at S/N 20 db)
(FM band at S/N 30 db)
Signal to noise (S/N) 20 db at 1000 KHz (Input ; 60 db) 40 db at 98 db (Input ; 60 db)
Power Output 280 mW at max. 280 mW at max.
Power Supply 120 V, 60 Hz, 6 W 120V, 60Hz, 6W

OPERATING INSTRUCTIONS
Preparations
Place the plug into a receptacle fl 10-120 V, 60 Hz ac source : the clock will run immediately.
Depress knob No. and turn it to set correct time on the indicator.
Knob No. will return to its resting position when it is recased.
Radio Part
Place knob No. in the "ON" position. The desired range is selected with the pushbutton
Pushbutton No. depressed = AM
Pushbutton No. not depressed = FM
This receiver is equipped with a FM wire antenna. The best receiver performance is achieved by extending the antenna,
which is pulled from the bottom of the cabinet to its full length.
The set is tuned to a station with the aid of knob No. -B, the volume control is accomplished with knob No. -A.
The set is turned off by placing knob No. is the "OFF" position.
Alarm Clock Combined with Radio
1. Waking up to Music
(a) Tune to station and adjust volume as described under "Radio".
(b) Turn knob No. clockwise to select the time on the indicator for the alarm when it is desired to go on.
The indicator for the alarm is calibrated by 10-minute intervals.
(c) Place knob No. in the "AUTO" position.
(d) The radio will start playing at the selected time (refer to item (b), above). It can be turned off by placing knob
No. in the "OFF" position.
2 Waking up to Music and Alarm
(a) Tune the radio as described under "Radio Part".
(b) Set the alarm (refer to "Waking up to Music", Item (b), above).
(c) Place knob No. in the "Alarm" position.
(d) At the selected time, the radio will wake up with the broadcast and the alarm will start ringing.
(e) The alarm can be turned off by turning knob No. to the "AUTO" position. In that case the radio will continue
to play. If it is desired to turn off the radio broadcast too, knob No. must be placed in the "OFF" position.
3. Waking up to Alarm Only
(a) Turn the volume control knob No. -A to its MAX COUNTER CLOCKWISE POSITION.
(b) Select the wake-up time with knob No.
(c) Return knob No. to the "ALARM" position.
START
DRUM
SPRING
POINTER
TUNING
SHAFT
3 1/2 TURNS
— 1 —

SECTION II
GENERAL ALIGNMENT INSTRUCTIONS
Should it become necessary at any time to check the alignment of this receiver, proceed as follows:
1. Connect an A.C. V.T.V.M. across the speaker voice coil.
2. Set volume control to maximum (fully clockwise).
3. Keep signal input at a low level to avoid AGC action.
4. Use a non-metallic alignment tool.
5. Signal generator and meters should be isolated from ground of house wiring during alignment.
Set band select switch to the AM positon.
AM ALIGNMENT
CHART
Step
1
2
3
Signal generator
Receiver
Connection to receiver Input signal freq. Dial setting Remarks
Connect the signal generator
through a 0.01
MF
capacitor to VC3, Connect
the ground lead to
the chassis ground.
Exactly 455 KHz
Quiet point on dial
(400 Hz, 30%, AM
near 1600 KHz
modulated)
Adjust for maximum
needle deflection
on A. C.
V. T. V. M. connected
across speaker
4 Repeat steps 1, 2, and 3 until no further improvement in sensitivity can be made.
Adjustment
AM. IFT (T-8)
AM, IFT (T-7)
AM, IFT (T-6)
5
6
7
Use radiation loop. Loop
of several turns of wire
connected across generator
leads. Place loop
close to the ferrite bar
antenna for adequate
signal pick-up.
Exactly 1680 KHz
(400 Hz, 30%, AM
modulated)
Exactly 520 KHz
(400 Hz, 30%, AM
modulated)
Exactly 1400 KHz
(400 Hz, 30%, AM
modulated)
Exactly 600 KHz
Tuning gang fully
open
Tuning gang fully
closed
1400 KHz
Adjust for maximum
need!e deflection
on A. C.
V. T. V. M. connected
across speaker
TC4 (OSC. trimmer)
AM OSC. coil (L-8)
TC3 (ANT. trimmer)
8
(400 Hz, 30%, AM
modulated)
600 KHz
AM ANT. coil (L-7)
9 Repeat steps 5, 6, 7 and 8 until no further improvement in sensitivity can be made.
Set band select switch to the FM position.
FM ALIGNMENT
CHART
Step
Signal generator
Receiver
Connection to receiver lnput signal freq. Dial setting Remarks
Adjustment
1
2
3
A
5
6
7
Connect the signal generator
across C12 through
a 0.001 MF capacitor.
Exactly 10.7 MHz
modulated
400 Hz, 22.5 KHz
deviation
FM modulated
Quiet point on dial
D.C. probe of
V.T.V.M. across
C29 Adjust for
FM, IFT T-5
FM, IFT T-4
FM, IFT T-3
maximum
deflection
FM, IFT T-2
of needle.
FM- IFT T-1
Repeat steps 1, 2, 3, 4 and 5.
D.C. probe of
Adjust T5
V.T.V.M. across
for zero V.T.V.M
C29
8
9
10
11
Connect high side of
signal generator to junction
of C1 and C2
Connect ground lead to
chassis ground.
Exactly 87 MHz
modulated as above
Exactly 110 MHz
modulated as above
Exactly 90 MHz
modulated as above
Exactly 106 MHz
modulated as above
Tuning gang
fully closed Adjust for maxmum
Tuning gang
fully open
needle deflection
on A. C.
V.T.V.M. connec­
90 MHz
ted across
speaker
106 MHz
FM OSC. coil (L-3)
TC2 (FM OSC.
trimmer)
FM RF coil (L-2)
TC29 (FM RF
trimmer)
12 Repeat steps 8, 9, 10 and 11 until on further improvement in sensitivity can be made.
— 2 —

DISASSEMBLY
Remove 2-screws ~ on the bottom of back cabinet and
separate the back cabinet from unit.
Remove 2-screws
SECTION III
REALIGNMENT
Push-out transparent plate No. with screwdriver for changing
new parts, (change to new Dial-scale or new back plate
for clock or new Digital-clock), after pull-out knobs (No. ,
and )
Transparent plate
Push
Out
FM.ANT
AC Cord
Remove a screw on the escutcheon's Leg for repairing
radio circuit.
Pull-out Dial-scale with your finger.
Remove a screw
Clock Pull-out Dial scale No. 4
Circuit
Ass'y
Remove 2-screws ~ on the escutcheon's leg, and also
remove 2-screws ~ on the back cabinet, for changing
new speaker.
Remove 4-screws ~ with screw-driver.
Remove 2 screws
Speaker
Remove 4-Screws
Tuning shaft
No. 6 B
VR No.6 A
Back plate
No.5
Remove 2 screws
Clock
— 3 —

SECTION IV
WIRING DIAGRAM
NOTE
L7 : AM BAR ANT COIL
L8 : AM O.S.C COIL
T6 : AM I.F.T
T7 : AM I.F.T
T8 : AM I.F.T (DET.)
L1 : FM ANT COIL
L2 : FM RF COIL
L3 : FM O.S.C COIL
L4 : FM TRAP (107 MHZ)
T1 : FM I.F.T
T2 : FM I.F.T
T3 : FM I.F.T
T4 : FM I.F.T
T5 : FM I.F.T (DET)
— 4 —

SECTION
V-A
SERVICE PARTS LIST
(For CIRCUIT COMPONENTS)
Code No. Symbol No. Description
16103190930 Q1 Transistor 2SC930D FM, RF
16104190930 02 " 2SC930E FM, OSC
16103190930 Q3 " 2SC930D AM, Converter
16104190930 Q4, 5 " 2SC930E I.F.
16308290537 Q6 " 2SC537G1 AF
16309290537 Q7 " 2SC537G2 Driver
16202190187}
16203190187}
Q8, 9
16411190188 D1, 5 Diode 1S-188 AM
16405990022 D2 " CDG 22
16401190188 D3, 4 " 1S-188 FM
16540881851 D5, 6 Selenium BST10A102
16633992500 TH Thermister 250ohm
00041047001 L1 FM ANT Coil
00042082038 L2 FM RF Coil
00041047000 L3 FM Converter Coil
00021142287 L4. 5, 6 IF Trap Coil
00511081852 L7 AM ANT Coil
00300081853 L8 AM OSC Coil
00100081854 T1 FM IFT (A)
00102081855 T2 FM IFT (B)
00102081855 T3 FM IFT (C)
00104081857 T4 FM IFT (D)
00105081858 T5 FM IFT (E)
00700081859 T6 AM IFT (A)
00701081860 T7 AM IFT (B)
00702081861 T8 AM IFT (C)
10202081863 T9 Input Transformer
15000033747 P. C. B.
08543042135 VC P. V. C
01156081812 VR VR
31340082096 Spacer
04514033784 Switch
43591549550 Spring
40421133960 Drum for Tuning
40305281865 Shaft
49023981867 Chassis Ass'y
50014181870 Bracket for SW.
40140081871 Pointer
41233281873
45020092605
Ant. Holder
Screw for P. V. C. fitting
2.6x5%
45030092005 Screw for bracket 2x5%
45020092005 Screw for ANT. Holder and chassis fitting 2x5%
45501592000 Nut for ANT. Holder and chassis fitting 2
45020092605 Screw for drum 2.6x5%
63059133800 Snow box (upper)
63059233801 Snow box (bottom)
64212252280 Poly bag
12312094706 C41, 42 Capacitor, Electrolytic 470uF/10V
12312092206 C38 " " 220uF/10V
12312091006 C40 " " 100uF/10V
— 5 —

SECTION
V-B
SERVICE PARTS LIST
(For CIRCIT COMPONENTS)
Code No. Symbol No. Description
12311092205 C39 Capacitor, Electrolytic 22uF/6V
12312094704 C24, 26 " " 4.7uF/10V
12131295002 C35 " Mylar 0.5uF
12201092000 C47 Capacitor, Styrol 200PF ±5%
12131291002 C32 " , Mylar 0.01uF
00021088633 L9 Choke Coil 5uH
12201091400 C33 Capacitor, Styrol 140PF ±5%
12501592002 C16 Capacitor, Ceramic 0.02uF
12501892002
C13, 14, 17, 19, 20, 21.
C23, 25, 30, 34
" " 0.02uF +100%/-20%
12501895001 C29, 28 " " 0.005uF
12501892001 C37 " " 0.002uF
12501891001 C2, 3, 11. 15, 43 " " 0.001uF
12501495000 C8, 45 " " 500PF ±10%
12501493500 C27 " " 350PF
12501391500 C5 " " 150PF ±5%
12501391000 C36. 44 " " 100PF
12501390950 C1O " " 95PF
12501390450 C9 " " 45PF
12501390200 C1 " " 20PF
12501090150 C4 " " 15PF ±0.5PF
12501090030 C6 " " 3PF ±0.5PF
12501090020 C22, 18 " " 2PF ±0.5PF
12501490300 C31 " " 30PF ±10%
12501090060 C7 " " 6PF ±0.5PF
12501090100 C12, 46 " " 10PF ±0.5PF
11144690330 R42 Resistor 1/4W 33ohm
11044690220 R39 " " 22Kohm
11044695600 R30 " " 560Kohm
11044694700 R23 " " 470Kohm
11044691002 R20 " " 10Kohm
11144692203 R4, 27 " " 220Kohm
11144691503 R21, 2, 24 " " 150Kohm
11144691003 R5 " " 1OOKohm
11144693903 R1O " " 390Kohm
11144698202 R43 " " 82Kohm
11144691202 R26 " " 12Kohm
11144691002 R17 " " 10Kohm
11144694701 R6, 18 " " 4.7Kohm
11144691801 R35, 36 " " 1.8Kohm
11144691501 R15, 16 " " 1.5Kohm
11144691001 R1, 3, 7, 13, 19 " " 1Kohm
11144691500 R8 " " 150ohm
11144698200 R12 " " 820ohm
11144695600 R28 " " 560ohm
11144694700 R11 " " 470ohm
11144693300 R32 " " 330ohm
11144692200 R9, 25, 33, 37, 40, 41 " " 220ohm
11144691000 R14, 31 " " 100ohm
11144690100 R22, 29 " " 10ohm
11144690022 R34, 38 " " 2.2ohm
14123084759 Neon Lamp (117V) use clock Lamp
— 6 —

SECTION
V-C
SERVICE PARTS LIST
(For CABINET COMPONENTS)
Code No. Symbol No. Description
10061036176 Power transformer
05412041257 A. C. cord
21113010611 Escutcheon
20220010612 Back cabinet
22000022007 Transparent Board
22132035648 Dial scale
25429084804 Back plate for clock
25660084805 Clock knob for Auto-OFF-ON SW.
25660084806 Clock knob for time set SW.
27111083394 Knob ass'y for VR and Tuning control
50104584305 Nut
50103784295 Nut
43299983236 Bracket for SP fitting
31461248000 Cushion
06420035391 Digital clock ass'y
63035122154 Snow box
64330083238 Poly bag
64210152268 Poly bag
61082035649 Gift box
60005035650 Master carton
60005035651 Shipping carton
SECTION VI
SCHEMATIC DIAGRAM
TOYO
RADIO CO, OF AMERICA, INC.
DISTRIBUTED BY TOYO
TOYO RADIO COMPANY OF AMERICA, INCORPORATED
MANUFACTURERS OF HOME ENTERTAINMENT PRODUCTS
ADDRESS: 1842-B WEST 169TH STREET GARDENA, CALIFORNIA 90247
TELEPHONE: (213) 321-4072 - TELEX - 67-3264
Printed in Japan
75610 041172