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PRINCIPLES OF OPERATION REV.A 2.2.1.2 Overcurrent Prevention Circuit of the MOS-FET On-Off Contro! Circuit The circuit which consists of the transistor Q4 and Q5 works as foliows: * If the input voltage is higher than the standard voltage t the Q5 collector current flows instead of the Q4 collector current. R11 05 R12 et FET Vin Q1 Q2 HA16654 OB 7 5 OUT VRef
REV.A PRINCIPLES OF OPERATION 1) If the current flowing in the MOS-FET increases, the induced voltage (e2) increases. 2) If the voltage which is distributed at R15 and R16 is higher than the standard voltage at R10 and R11, the Q5 collector current flows. 3) If positive voltage is applied between base and emitter of transistor Q3, then the collector current flows. 4) If the voltage at the DB terminal in the HA16654 increases, and the pulse width is reduced, then the current decreases. 2.2.1.3 Inrush Current Prevention Circuit The inrush prevention circuit protects diode bridge DBI and subsequent components from being damaged by excessive current flow in C12 and C13 at power-up. R3 limits the current to RC1 when power is applied; when the switching oscillator operates normally, voltage from Tl activates TRIAC CRl, permitting current flow to RC1. eR1 T 2 T 1 ~O R3 FIGURE 2-2-6. INRUSH CURRENT PREVENTION CIRCUIT 2-5
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: REV .A PRINCIPLES OF OPERATION 1 D1
Page 35 and 36: REV . B PRINCIPLES OF OPERATION 2.2
Page 37 and 38: REV.A PRINCIPLES OF OPERATION A vol
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
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N I VI \oll lOG......T... ' TOGur..
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N I VI GAATCK GAATAB GAATRF l5590 a
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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
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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
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CHAPTER 3 OPTIONS TAßlE OF CONTENT
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REV.A TROUBLESHOOTIBG 4.1 Service T
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RKV.A TROUBLESHOOTING INSTANCE 1 In
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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.
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CHAPTER 6 ADJUSTMENT AHD MAINTENANC
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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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DIAGRAHS AND REFERENCE MATERIALS RE
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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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DIAGRAMS AHn REFERENCE MATERIALS RE
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DIAGRAMS ARD REFERENCE MATERIALS RE
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DIAGRAKS AND REFERENCE MATERIALS HE
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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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DIAGRAMS ABO REFERENCE MATERIALS RE
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8.1 MAJOR PARTS 8.1.1 Excluding P.C
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8.2 COMPONENT PARTS 8.2.1 ANTA Boar
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Unit Description ANTA Board (6) Mod
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8.2.3 ANT-RMA Board Unit Modificati
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8.2.5 SPFG Board Unit Modification
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8.3.2 ANT-RM/RMA Board Jumper Setti
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8.3.4 WHDC Board Jumper Settings Un
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(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
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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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