Sega VA1 Service Manual Page 1

ll(lliA" SERVICE MANUAL GAME GEAR VA1 NO. 004 ISSUED DECEMBER, 1993 CONTENTS 1. SPECIFICATIONS········································ 3 2. IDENT

5-3. DC-DC Converter Circuit Board E 0 c 8 r I -I .. , l: : I I I L ----r----I r..v_ -, rzo:-<>---' I I I (_-_, CONN OC ,J~Ct< SW1 ~ 2

6. CIRCUIT BOARD DIAGRAMS 6-1. Main Circuit Board (AC120V area) 1 2 -15-[Top View] [Bottom View] ... . ~ : r· ~~ -----~-~~~-.. # ... (!Hiii iilmlmmumi

6-4. Main Circuit Board (AC230V/240V area) E D c .:: B A .. IC3 M320 M33 H29 H30 . M310 bO OH28 M27 H26 H25 1 . QOOO ;UM8 ..• 01-19 :. -.. _.-~ Ml ft

7. PARTS SPECIFICATIONS 7-1. Main Circuit Board IC1 Custom Chip GG QFP 144P •Top View 108 109 114 • Description No. I Pin Name No. I Von 37 2 AO 38 3

IC2 IC HM65256BLFP-12 • Top View & Pin Layout • Operation Mode CE OE L L L X L H H L H I H IC3 IC 11 PD4364G-15L IC MB8464A-1 OLL I 1/00-1/07 C

IC4 Dual Operational Amplifier IC 11 PC358G2 •Top View IC NJM2904-01 • Pin Layout 8 5 VDD 0 4 7-2 DC-DC Converter Circuit Board IC1 IC MB3775PF-G-BN

7-3 Sound Circ..,it Board IC1 ICTDA2822M • Top View & Pin Layout • Block Diagram Cl '" 09 -------~-------Q17 07 -22-

& PARTS LIST EXPLODED VIEW 8· v· w loded 18 8-1. Exp . Assembly 8-1-1. MaiM / ' I I I I I l / _..-" 2 13-3 ... ... ... / / / /

8-1-2. Sub Assembly F E D c :B A 2 3 -24-403 C!>A---15 1:#---~203 4

8-2. Mechanical Parts List .. 8-2-1. Main Assembly Ref I Parts No. I Description Circuit! Parts No. I Description No. No. 1 r 1 610-5403 ASSY TOP CASE

BEFORE USING THIS SERVICE MANUAL This service manual covers the one-chip custom LSI (CPU+VDP+SCA). The First Serial No. of 1 Chip Version Unit. • AC

I I 3 3 4 14 M M5 MS :M5 cM6 EMS EM6 EM7 EM7 EM7 EMS ·--al Parts list Circuit Board . No. Oeser i pt ion ) IC CUSTOM CHIP GG QFP 144P NEC T-A IC HM652

C 1 rcui t 1 Parts No. I Desc r 1 ptl on Circuit Parts No. Descript1on No. t No. I R56 476-2182-J-10 RES CHIP 1.8K OHM 1/lOW S~ CS9 1Sl-026S CAP CER

rcu1t I Parts No. I Desc r i pt i on Circuit Parts No. I Description No. No. ~ R14 476-2203-F-10 I RES CHIP 20K OHM 1/10W 1" R15 476-2682-F-10 RE

8-4. Accessories/Package List No. Parts No. 1 400-5050 1 400-5109A 1 400-5204 Oeser i pt ion AC ADAPTOR AC240V/DC9V !A AS(AUSTRALIA) AC ADAP. AC240V/D

© 1993 Sega Enterprises, Ltd Printed in Japan (/) 31209

1. SPECIFICATIONS Ratings Internal AC Adaptor Power input External BaneryPack Car Adaptor Power consumption Operating environment Dimensions Specifica

2. IDENTIFYING PARTS 2-1. Front & Top Views of Console Power Light (POWER) Directional Button'---+-(PAD GG) ... ... .. ... .. .. ..

3. DISASSEMBLY 3-1. Dismantling Procedure Removal of bottom screws and bottom case (See Fig.1 ). 1) Turn the power button off. 2) Tum over the unit

3-2. Reinstalling procedure Sound board and DC-DC converter board reinstallation. 1) Attach the power knob to the DC-DC converter board. 2) Anach the

4. BLOCK DIAGRAM MAIN BOARD 1 CHIP=CPU+VOP+SCA ICl IC CUSTOM CHIP IC3 JLP04364G-1 5L MAIN RAM 64KBIT STATIC RAM r-------------------- -Z80A CENTRAL PR

5-2. Main Circuit Board-2 v 1ce. P 11 .. aJ .,.,..., ... t -101< FWII 101< CIU HilT ANTI caz RC11 .. 71< ill IT ANTI 1'132 1001< 2