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PRINCIPLES OF OPERATION KEV.A L5 V I N O>-----.W VOUT 10 Q3 2.2 K 10 100 51K cathode Z3 anode RV2 470n GND GN 0 FIGURE 2-2-11. VOLTAGE STABILIZATION CIRCUIT 11 If the Vout voltage rises, the Vref voltage rises and then the cathode current increases. After that the Q3 collector current increases, and the Vout voltage decreases ---- Function 1 If the Vout voltage decrease, the Vref voltage decreases and the cathode current decreases. After that the Q3 collector current decreases and the Vout voltage rises -_._.- Function 2 CATHOOE CURRENT [A] REFERENCE VOLTAGE [V] FIGURE 2-2-12. CHARACTERIZE OF Z3 2-8
REV.A PRINCIPLES OF OPERATION A voltage stabilization circuit repeats the above functions and stabilizes the 12V line. If a stable Vout voltage is lo\/er than +12 volts, let down a RV2 resistor value. If let down a resistor value, the Vref voltage decreases and the cathode current decreases. After that, the Q3 collector current decreases and the Vout voltage rises. In the same way, if a stable Vout voltage is higher than +12 volts, let up the resistor value of volume RV2. c) Fan Revolution Speed Control Circuit 12V -----...----, When temperature increases, ~ value of resistance decreases. TH1 FAN GN D-----....-------
Page 1 and 2: EPSON pe AX TECHNICAL MANUAL Seiko
Page 3 and 4: PRECAUTIONS Precautlonary notations
Page 5: PREFACE Thls manual descrlbes the t
Page 9: CHAPTER 1 PRODOCT DESCRIPTION TAßL
Page 12 and 13: PRODUCT DESCRIPTION REV.A WX Clock
Page 14 and 15: PRODUCT DESCRlP TION REV.A 1.2.1 Ma
Page 16 and 17: PRODUCT DFßCRIPTION REV.A 1.2.5 D5
Page 18 and 19: PRODUCT DESCRlPTION HEV.A 1.3 HARDW
Page 20 and 21: PRODUCT DESCRIPTION HEV.A TABU 1-3-
Page 22 and 23: PRODUCT DESCRIPTION REV.A FIGURE 1-
Page 24 and 25: 2.3.9 2.3.10 2.3.10.1 2.3.11 2.3.12
Page 26 and 27: 2-3-14 2-3-15 2-3-16 2-3-17 2-3-18
Page 29 and 30: REV.A PRINCIPLES OF OPERATION 2.1 H
Page 31 and 32: REV .A PRINCIPLES OF OPERATION 1 D1
Page 33 and 34: REV.A PRINCIPLES OF OPERATION 1) If
Page 35: REV . B PRINCIPLES OF OPERATION 2.2
Page 39 and 40: HEV.A PRINCIPLES OF OPERATION Chara
Page 41 and 42: RKV.A PRINCIPLES OF OPERATION 2.2.2
Page 43 and 44: REV.B PRINCIPLES OF OPERATION +12 +
Page 45 and 46: REV.A PRINCIPLES OF OPERATION TABLE
Page 47 and 48: N I I-' \Q 2 .3 ARTA MAHl CONTROL B
Page 49 and 50: N I N """ 2.3.1 System Clock Genera
Page 51 and 52: N I N W 2.3.1.4 Oscillator There ar
Page 53 and 54: N 2.3.2 System Reset Signal Generat
Page 55 and 56: N +5·5 ~Hls~ CN3~--·"'-" (j flJ5:
Page 57 and 58: t-,) I t-,) ID 2.3.3.3 Jumper Conne
Page 59 and 60: N ( OA TA BUS C~ TO FRO"" RA"" RA""
Page 61 and 62: N I ~ ~ 2.3.4.2 Circuit Operation o
Page 63 and 64: N I ~ To int......l ....ry GAATCK _
Page 65 and 66: MOlS l :;1 MOl l@j { i~~~TRI l READ
Page 67 and 68: N I wIQ - 1. . . I :>
Page 69 and 70: !',) I oll J-I 2.3.5 "C 1/0 Devic
Page 71 and 72: N },. w The LS612 has sixteen 12-bi
Page 73 and 74: N I ~ GAATCK 10 GAATM21 I ino OMA 1
Page 75 and 76: N I 01> -..I GAATCK { CPU GAATM' @
Page 77 and 78: N I ~ (16-bit bus operation) * NOTE
Page 79 and 80: N I \Jl ~ 2.3.8 Command Delay Signa
Page 81 and 82: INT , \ DTR 00 DEN ) t +,5 INT..H C
Page 83 and 84: N I VI \oll lOG......T... ' TOGur..
Page 85 and 86: N I VI GAATCK GAATAB GAATRF l5590 a
Page 87 and 88:
N I VI \Cl - _.... -- - ~ AATRF GAA
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N ~,... 2.3.14 Keyboard Interface C
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N ~ IJ,) KID CLK KID DATA GAATCK GA
Page 93 and 94:
REV.A PRINCIPLES OF OPERATION 2.4 M
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HEV.A PRINCIPLES OF OPERATION Data
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REV.A PRINCIPLES OF OPERATION 1.2 M
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REV.A PRINCIPLES OF OPERATION 2.4.3
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REV.B PRINCIPLES OF OPERATION VFO c
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REV.A PRINCIPLES OF OPERATION If DS
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REV .A PRINCIPLES OF OPERATION 2.5
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REV.A PRINCIPLES OF OPERATION 2.5.2
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REV .A PRINCIPLES OF OPERATION T6 ~
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REV .A PRINCIPLES OF OPERATION 2.5.
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REV.A PRINCIPLES OF OPERATION (4) I
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HEV.A PRINCIPLES OF OPERATION 2.5.7
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REV.A PRINCIPLES OF OPERATION ii) E
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REV.A PRINCIPLES OF OPERATION Key C
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REV.A PRINCIPLES OF OPERATION 1) DE
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REV .A PRINCIPLES OF OPERATION (10)
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REV.A PRINCIPLES OF OPERATION (3) B
Page 127:
CHAPTER 3 OPTIONS TAßlE OF CONTENT
Page 131 and 132:
REV.A TROUBLESHOOTIBG 4.1 Service T
Page 133 and 134:
RKV.A TROUBLESHOOTING INSTANCE 1 In
Page 135 and 136:
REV.A TROUBLESHOOTIBG 4.3 RESPONSE
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t PORT 80 01H 04H 05H 06H 07H or 08
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t (3) Error bit pattern (1 second)
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tt-' t-' 22H 23H 25H II GAATIO 8259
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2AH 2BH 8254-2 RAM, GAATIO option b
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t~ I.n (3AH) Unfixed value (Address
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,... I ..... .t:' (3FH) Unfixed v
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ol:l I t \C (45H) WHDC Unfixed
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.p I N ""'" Parity check 1 80000
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Fi gure 5-1-1 5-1-2 5-1-3 5-1-4 5-1
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DIASSEMBLY AND ASSEMBLY HEV.A 5.1.3
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DIASSEMBLY AND ASSEMBLY REV.A 5.1.7
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DIASSKMBLY AN» ASSKMBLY HEV.A 5.1.
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DISASSEMBLY AND ASSEMBLY REV.A 5.1.
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DISASSEKBLY ABO ASSEKBLY REV.A 5.1.
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DISASSEMBLY AND ASSEMBLY REV.A 5.3
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DISASSEMBLY AND ASSEMBLY REV.A 5.3.
Page 171:
CHAPTER 6 ADJUSTMENT AHD MAINTENANC
Page 174 and 175:
7-1-8 Factory Settings (SPFG Board)
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DIAGRAMS AND REFERENCE MATERIALS RE
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DIAGRAKS AHn REFERENCE MATERIALS HE
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Page 182 and 183:
DIAGRAHS AND REFERENCE MATERIALS RE
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Page 188 and 189:
DIAGRAHS AHn REFERENCE MATERIALS RE
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DIAGRAMS AN» REFERENCE MATERIALS R
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D1AGRAKS AND REFERENCE MATERIALS RE
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DIAGRAMS AHn REFERENCE MATERIALS HE
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DIAGRAMS AND REFERENCE MATERIALS HE
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Page 202 and 203:
DIAGRAMS AHn REFERENCE MATERIALS RE
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Page 212 and 213:
DIAGRAMS ARD REFERENCE MATERIALS RE
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DIAGRAKS AND REFERENCE MATERIALS HE
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Page 226 and 227:
DIAGRAMS AB» REFERENCE MATERIALS R
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DIAGRAMS AND REFERENCE MATERIALS KE
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DIAGRAHS AND REFERENCE MATERIALS HE
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DIAGRAMS AN» REFERENCE MATERIALS H
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DIAGRAMS AN» REFERENCE MATERIALS H
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DIAGlU\MS AND REFERENCE MATERIALS H
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Page 262 and 263:
Page 264 and 265:
DIAGRAMS ABO REFERENCE MATERIALS RE
Page 267 and 268:
8.1 MAJOR PARTS 8.1.1 Excluding P.C
Page 269 and 270:
8.2 COMPONENT PARTS 8.2.1 ANTA Boar
Page 271 and 272:
Unit Description ANTA Board (6) Mod
Page 273 and 274:
8.2.3 ANT-RMA Board Unit Modificati
Page 275 and 276:
8.2.5 SPFG Board Unit Modification
Page 277 and 278:
8.3.2 ANT-RM/RMA Board Jumper Setti
Page 279 and 280:
8.3.4 WHDC Board Jumper Settings Un
Page 281:
(Xl .... I 01 8.4.2 P.C.B Unit Boar
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1 2 3 4 +5 +5 A B c o E F G H R8 Sl
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1 2 3 4 5 +5 +5 A B c o E F G H R8
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1 2 3 4 5 +5 +5 A B c o E F G H R8
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A B c D E F G H J K L M N o p 4~3 ~
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I T MD 111 I" 13 12 • 11 10 9 •
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PG TO POWER SUPPlY UNIT NO CONNECT
Page 298 and 299:
OUTPUT SOCKET ® RIII CI06 O.OI/lF
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T DACK2 2 3 4 t- 0 ...J CJ) Z 0 5 0
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A B c o E F G H 1 2 3 4 5 6 I ọ
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* +5V -r ,,;I: R2 01 ~ J27K + ~ CI
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I A B c o E F G H T 2 3 JI -DRIVE S
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134 132 126 500 \ --- ~ I 103 /~'~3
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EPSON OVERSEAS MARKETING LOCATIONS
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