Sega 32X User manual

iiM' SERVICE MANUAL
GENESIS 32X(VA0,VA1) /MEGA DRIVE 32X
NO. 012
ISSUED JUNE. 1995
CONTENTS
1. SPECIFICATIONS 2
2. IDENTIFYING PARTS 3
3. ACCESSORIES 3
4. DISASSEMBLY 4
5. ADJUSTMENT 5
6. BLOCK DIAGRAM 7
7. SCHEMATIC &CIRCUIT BOARD DIAGRAMS 9
8. PARTS SPECIFICATIONS 19
9. EXPLODED VIEW &PARTS LIST 34
9-1. Exploded View 34
9-2. Mechanical Parts List 35
9-3. Electrical Parts List 35
9-4. Accessories/Package List 38
Sega Enterprises, Ltd.

BEFORE REFERRING TO THE SERVICE MANUAL
Since the circuit of the Extension Unit used in the GENESIS 32X has been integrated on the main circuit board, an Extension
Unit is not necessary for the GENESIS 32X(VA1).
This circuit is built into the MEGA DRIVE 32X from the first unit.
1. SPECIFICATIONS
Ratings
Model GENESIS 32X MEGA DRIVE 32X
PAL PAL G/l
Power input Input: AC120V, 60 Hz
Output: DCIOV, 850 mA Input: AC230 V, 50 Hz
Output: DCIO V, 850 mA Input: AC240 V, 50 Hz
Output: DC9 V, 850 mA
Power consumption Approx. 4WApprox. 4WApprox. 4W
Operating environment Temperature: S'C~35‘C
Humidity: 20%RH-80%RH (no condensation)
Dimensions 115(W)X210(L)X 100(H) mm
Specifications
CPU
Master 32bit RISC SH2 23 MHz 20MIPS
Stave 32bit RISC SH2 23 MHz 20MIPS
Memories
RAM 2Mbit (SDRAM)
VRAM 2Mbit
Sound PWM Sound Source (Stereo)
VDP SEGA custom LSI
Display TV
Display capability Color 32,768 colors
VIDEO
Video Output RF
RGB
Slots Cartridge slots
I

2. IDENTIFYING PARTS
Front View Rear View
3. ACCESSORIES
Connector Cable y
Conversion Cable Audlo/Video Cable (Mono)
Spacer for GENESIS II
/MEGA DRIVE II
AC Adaptor Bectromagnetic Shield Plates
Qf]=CUO
Mono Cable Scart
(France only)
Extension Unit
(Only GENESIS 32XVA0)
^=[Z)=oQEi
RF Unit
(PAL version except for France)
-3-

4. DISASSEMBLY
4-1. Top Case Removal (See Fig. 4-1)
I
)
Remove four screws ®and the top case.
4-2. Sub Board Removal
(See Fig. 4-2)
1)Remove ten screws ®attached the top shield case.
2) Remove two screws ©attached the 64-pin
connector.
3) Remove two 40-pin flat cables on the sub board.
4) Remove the sub board showned as arrow.
4-3. Main Board Removal
(See Fig. 4-3, 4-4)
1) Remove four screws ®attached the front case and
rear case on the bottom case and then their
showned as arrow.
2) Remove two screws ®attached the front case and
rear case and main board.
Flg.4>2
-4-

5. ADJUSTMENT
Video Frequency Matching Adjustment
Test equipment and tools for adjustment
1.Regulated power supply (5VDC)
2. Frequency counter (capable of displaying 7digits or more)
3. 10:1 oscilloscope probe
4. Philips screwdriver
5. Non-metal adjustment driver
6. AC adaptor excusively for super 32X
7. One lead for GND and two leads forSV
Connections of test equipment
Adjustment procedure
1.Disconnect the super 32X from the Mega Drive.
2. Remove the top case and top shield case from the super 32X.
3. Plug the AC adaptor into an AC outlet and into the DC jack.
4- Set the regulated power supply to 5V DC and connect itto IC14 pin 1. (The super 32X turns on.)
5. Connect 5V DC to ICl 2pin 31 .(Set to the test mode.)
6. Connect the frequency counter to ICI2 pin 20 and adjust C72 so the frequency is 3.579545 MHz ±lOHr.
-5-

6. BLOCK DIAGRAM

7. SCHEMATIC &CIRCUIT BOARD DIAGRAMS
7-1. Schematic Diagram-1 (Main Section -1/2)

MEMO

7-2. Circuit Board Diagram (Main Board) VAO
ABD

7-3. Schematic Diagram-2 (Main Section -2/2)
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