Sega Game Gear
ll(lliA"
SERVICE MANUAL
GAME GEAR VA1
NO.
004
ISSUED
DECEMBER, 1993
CONTENTS
| 1. SPECIFICATIONS•••••••••••••••••••••••••••••••••••••••• | 3 |
|---|---|
| 2. IDENTIFYING PARTS • • •• •• • •• • • • • • • • • •• • •• •• • | • • ••••••••• 4 |
| 3. DISASSEMBLY •••••• •• •• •• • • •••••••• •• • • • • •• • | •••••••••• •5 |
| 4. BLOCK DIAGRAM • • • •• •• •• •• • • • • • • • • • ••• • • • • • | • ••••••••• • 7 |
| 5. SCHEMATIC DIAGRAMS • • • • • •••••••• • •• • • •••• | •• • ••••••• •9 |
| 6. CIRCUIT BOARD DIAGRAMS • ••••• •• • • •• • • •• • • | ••••••••• • 15 |
| 7. PARTS SPECIFICATIONS•••••••••••••••••••••••••••••••• | 19 |
| 8. EXPLODED VIEW & PARTS LIST • • • • • •••• •• •• | •• • • ••••••• 23 |
| 8-1. Exploded View• •• •• •• • • • ••••••••• •• • •• • •• • | •• ••••••••• 23 |
| 8-2. Mechanical Parts List • • • • •• ••••••• •••••• ••• • | •••••••••• 25 |
| 8-3. Electrical Parts List • •• •• • •••••••• •• • ••• • •• • | •• • •••••••• 26 |
| 8-4. Accessories/Package List • • • •• • • • • • •• ••• • • •• • | •• • • ••• • • • 29 |
Table Caption: This table is a table of contents, listing chapter titles and their corresponding page numbers. The chapters cover specifications, parts identification, disassembly, diagrams, and parts lists.
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 120V area
-
AC 230V/240V area
-
0201 76537-(For USA)
-
020019501-
-
020168498-(For CANADA)
-
B30000001-
-
B20135204-
-
K37000001-
-
K201 17921-
-
P31020001-
-
P31000001-
• COMPARISON WITH ANOTHER MODEL
Electrical Components
| COMPONENT | GAME GEAR VAO | GAME GEAR VA1 |
|---|---|---|
| CPU | IC Z80A | IC CUSTOM CHIP GG |
| VIDEO PROCESSOR IC | IC CUSTOM CHIP VDP GG | |
| 1/0, LCD CONTROL IC | IC CUSTOM CHIPSCA GG | |
| MEMORY FOR CPU'SPROGRAM | IC UPD4364G-15L | Same as on left |
| MEMORY FOR VIDEO PROCESSOR IC | IC HM65256BLFP-12 | Same as on left |
| OPAMP | IC UPC358G2 | Same as on left |
| DUAL SWITCHING REGULATOR | ICMB3775 | Same as on left |
| DUAL LOW-VOLTAGE POWER AMP | ICTDA2822M | Same as on left |
Table Caption: This table compares the components of the Game Gear VA0 and VA1 models, highlighting that while the VA1 uses a custom chip for CPU, video processing, and I/O functions, many other components remain the same across both revisions. The custom chip in the VA1 appears to integrate multiple functions previously handled by separate ICs in the VA0.
•.,.
1. SPECIFICATIONS
Ratings
| Power input | Internal | 6 AA (LR6, HP7)Baneries (Longer life alkaline baneries are recommended.) | ||
|---|---|---|---|---|
| AC Adaptor | Input: ACI20V 60Hz | Output: DC9V 850mA | ||
| Input: AC230V/240V 50Hz | Output: DCIOV 850mA | |||
| External | BaneryPack | Input: DC9V | Output: DC7.2V l200mA/h | |
| Car Adaptor | Uses power from aI2V car banery. Input: DCI0.57V-l6V | Output: DC9V 800mA | ||
| Power consumption | 9V- 3W(ACI20Varea), IOV- 3W(AC220V/240V area) | |||
| Operating environment | Temperature: O"C -40"C, Humidity: l0%RH-80%RH (no condensation) | |||
| Dimensions | 2IO(W) X ll3(D) X 39(H) mm |
Table Caption: This table details the power input options, power consumption, operating environment, and dimensions for a device, specifying requirements for battery power, AC adapters, and a car adapter.
Specifications
| CPU | ZSOA (3.58MHz) | |
|---|---|---|
| Memories | RAM | 64kbit |
| V-RAM | l28kbit | |
| Audio | 3 types of sound + 1 noise. | |
| Display capability | VDP | SEGA custom LSI (l chip= CPU+VDP+SCA) |
| Scrolling Screens | 160 x 146 dot matrix 32 on-screen colors displayed from a palette of 4096 colors. | |
| Sprite Screens | 64 sprites on-screen with dimensions of 8 x 8 dot or 16 x I6 dot displayed from a palene of 4096 colors. | |
| Character Panerns | Maximum of 448 defined types possible. | |
| Scrolling Directions | Horizontal, vertical, diagonal. | |
| Display | 3.2" ColorLCD with Back-Light. | |
| Screen Dimensions | 65.27 mm wide x 48.90mm high | |
| Screen Composition | 160 dot wide x I46 dot high | |
| Headphone terminal | Plug in any set of normal headphones for private play. | |
| Extension terminal | To play multi-player games using more than one Game Gear system. | |
| Slots | For cartridge or TVTuner Adaptor |
Table Caption: This table details the technical specifications of a gaming device, covering its CPU, memory, audio capabilities, display features including resolution and sprite handling, screen dimensions, and available terminals and slots.
- Design and specifications are subject to change without notice.
2. IDENTIFYING PARTS
2-1. Front & Top Views of Console
2-2. Bottom View of Console
Note: Names of paJtS in brackets ( ) are used in the paJtS list.
2-3. Accessories
3. DISASSEMBLY
3-1. Dismantling Procedure
Removal of bottom screws and bottom case (See Fig.1 ).
-
- Turn the power button off.
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- Tum over the unit.
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- Remove both battery companment lids (8 & 9).
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- Remove screw (204).
-
- Remove six screws (20 I).
-
- Remove the bottom case (See Fig.2).
Lift bottom case in the direction of arrow (A) and make the open condition.
Remove the connector of DC-DC convener board fixed on the bottom case.
Disconnect two connectors of sound board.
Main board removal (See Fig.3).
-
- Remove two screws (202).
-
- Remove six screws (203).
-
- Remove the main board from the top case.
Sound board and DC-DC converter board removal (See Fig.4).
- I) Remove four screws (203).
-
- Remove the suppon plate from the bottom case.
-
- Remove two screws (203).
-
- Remove the sound board from the bottom case.
-
