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Sega Game Gear Va1 Service Manual

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SEGA™ SERVICE MANUAL

GAME GEAR VA1

NO.	004
ISSUED	DECEMBER, 1993

SPECIFICATIONS ..... 3
IDENTIFYING PARTS ..... 4
DISASSEMBLY ..... 5
BLOCK DIAGRAM ..... 7
SCHEMATIC DIAGRAMS ..... 9
CIRCUIT BOARD DIAGRAMS ..... 15
PARTS SPECIFICATIONS ..... 19
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

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

·020176537~(For USA)

AC 230V/240V area

· 020168498~(For CANADA)

·020019501~

·B20135204~

·B30000001~

·K20117921~

·K37000001~

·P31000001~

·P31020001~

• COMPARISON WITH ANOTHER MODEL

Electrical Components

COMPONENT	GAME GEAR VA0	GAME GEAR VA1
CPU	IC Z80A	IC CUSTOM CHIP GG
VIDEO PROCESSOR IC	IC CUSTOM CHIP VDP GG
I/O, LCD CONTROL IC	IC CUSTOM CHIP SCA GG
MEMORY FOR CPU'S PROGRAM	IC UPD4364G-15L	Same as on left
MEMORY FOR VIDEO PROCESSOR IC	IC HM65256BLFP-12	Same as on left
OP AMP	IC UPC358G2	Same as on left
DUAL SWITCHING REGULATOR	IC MB3775	Same as on left
DUAL LOW-VOLTAGE POWER AMP	IC TDA2822M	Same as on left

1. SPECIFICATIONS

Ratings

Power input	Internal		6 AA (LR6, HP7)Batteries (Longer life alkaline batteries are recommended.)
	External	AC Adaptor	Input: AC120V 60Hz Output: DC9V 850mA
			Input: AC230V/240V 50Hz Output: DC10V 850mA
		Battery Pack	Input: DC9V Output: DC7.2V 1200mA/h
		Car Adaptor	Uses power from a12V car battery. Input: DC10.57V~16V Output: DC9V 800mA
Power consumption			9V - 3W(AC120V area), 10V - 3W(AC220V/240V area)
Operating environment			Temperature: 0°C ~40°C, Humidity: 10%RH~80%RH (no condensation)
Dimensions			210(W) $ \times $ 113(D) $ \times $ 39(H) mm

Specifications

CPU		Z80A (3.58MHz)
Memories	RAM	64kbit
Memories	V-RAM	128kbit
Audio		3 types of sound + 1 noise.
Display capability	VDP	SEGA custom LSI (1 chip= CPU+VDP+SCA)
	Scrolling Screens	160 × 146 dot matrix 32 on-screen colors displayed from a palette of 4096 colors.
	Sprite Screens	64 sprites on-screen with dimensions of $ 8 \times 8 $ dot or $ 16 \times 16 $ dot displayed from a palette of 4096 colors.
	Character Patterns	Maximum of 448 defined types possible.
	Scrolling Directions	Horizontal, vertical, diagonal.
	Display	3.2" Color LCD with Back-Light.
	Screen Dimensions	65.27 mm wide × 48.90mm high
	Screen Composition	160 dot wide × 146 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 TV Tuner Adaptor

$ ^{*} $ Design and specifications are subject to change without notice.

2. IDENTIFYING PARTS

2 -1. Front & Top Views of Console

Power Light (POWER)

Color LCD TV Display Start Button (START)

Directional Button (PAD GG)

Speaker Button 1 & 2

Power Switch (POWER) Volume Control (VOLUME)

Power Input Jack Headphone Jack (PHONE)

Gear-to-Gear Cable Input (EXT)

2 -2. Bottom View of Console

Cartridge Slot (CARTRIDGE) Battery Compartment Cover (BATT LID LEFT GG) Accessory Screwhole Battery Compartment Cover (BATT LID RIGHT GG)

Note: Names of parts in brackets () are used in the parts list.

2 -3. Accessories

Strap Game Cartridge AC Adaptor (Provided or sold separately) (Kuwait)

3. DISASSEMBLY

3 -1. Dismantling Procedure

Removal of bottom screws and bottom case (See Fig.1).

Turn the power button off.
Turn over the unit.
Remove both battery compartment lids (8 & 9).
Remove screw (204).
Remove six screws (201).

9 201 8 204 201 201

Fig-1

Remove the bottom case

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