Sega Genesis II VA3 Service Manual

IIllA"

SERVICE

MANUAL

GENESIS

II

VA3

NO.

001-3

ISSUED

AUGUST, 1994

CONTENTS

1.

DIFFERENCE

TABLE····································

· · · 2

2.

BLOCK

DIAGRAM

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3

3.

SCHEMATIC

DIAGRAMS···································

5

4.

CIRCUIT

BOARD

DIAGRAMS·······························

9

5.

PARTS

SPECIFICATIONS··································

13

6.

EXPLODED

VIEW

& PARTS

LIST

· · · · · · · · · · · · · · · · · · · · · · · · · · 14

6-1.

EXPLODED

VIEW···································

14

6-2.

MECHANICAL

PARTS

LIST··························

15

6-3.

ELECTRICAL

PARTS LIST · · · · · · · · · · · · · · · · · · · · · · · · · · · 15

6-4.

ACCESSORIES/PACKAGE

LIST·······················

18

Sega Enterprises, Ltd.

Before Using This Service Manual

o Parts of

the

circuits arc different

in

the

GENESIS

II

depending

on

the

model

of

IC

II

(RGB

encoder

used).

Check

the

model

of

IC

II

on

the

main

circuit

board

and

identify the type,

F,

S or

SM.

Type Model

of

1C11

Part

No.

1C11

1C1

F

IC

MB3514PF-G-BND-EF 313-5232-A

......

D

s

IC

CXAI145M-T6 SOP 313-5213-A

SM

IC

KA2195D

313-5236-;\

I I

CN3

0

1C6

MAIN C.B (Top View)

o Differences

in

the

circuits

are

shown

in

the difference table

in

the

schematic diagrams.

o

In

the

parts

list,

differences

are

shown

in

the

REMARKS

columns.

o This

unit

is

a revision of GENESIS

TI , and

IC9

and

ICIO

have

been

integrated

into

one chip.

o Accompanying

this

integration,

the

circuits

have

also

been

changed

and

the

board

has

been

made

slightly smaller.

o Refer

to

the

following for differences regarding parts

that

have

been

changed.

o For

the

details of changes, refer

to

this service

manual

and

service manual

No.

001

or

manual

No.

001-2 that

is

a revision of

manual

No.

001

to

compare

the

differences.

10

DIFFERENCE TABLE

Circuit

GENESIS

VA1

GENESIS

VA3

-

No.

Part

No.

:

Description

Part

No.

Description

I

I

837-9793-S

IC

BD

MD2

VA1S

USA

837-10

150-S

IC

BD

MD2

VA3S

USA

837-9793-SM

IC

BD

MD2

VAISM

USA

837-10150-SM

IC

BD

MD2

VA3SM

USA

837-9793-F

IC

BD

MD2

VA

IF

USA

837-10150-F

IC

BD

MD2

VA3F US;\

IC9

313-5063-A

IC

LM

324SOP

315-5684

IC

CUSTOM

CP

Bi\

6166FS SOP

313-5221-A

IC

BAI0324AF-T1 SOP

--

--

-----

. ---

--

--

--------

IC10

313-5063-A

IC

LM

324 SOP

NOTHING

NOTHING

313-5221-A

IC

BAI0324AF-TI SOP

-2-

2.

BLOCK

DIAGRAM

!PERIPHERAL

DEVICE

GAME

CARTRIDGE

r----------------------------------------------------------------------------------------------------------------,

I IC7 :

: I

MSM54C864

I

1

V-RAM

1

I I

1

64KB

1

ANTENNA

T

I

~~

1'

OSCl

r"r-

IC6

ICll

~~

ZCLK 3 SMHZ

MB3514

I

E

l

VCLK 7 6MHZ

3!5-5487-IOR

------,VIDEO/

I

EOCK

MCLK

r-

1

CN3

CN2

'

~----~MC~LK~

RGB/

AUDIO

I

:

VCLK

i~~~

~~'

-=-------ul

:

.i.~.~,

U H

;;j;;l

j I

~rL

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s_3_69_3_1MH_z--t---t-t-t-

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---~-vcLK

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J

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ADDRESS/CONTROL

BUS

116

b i

tl

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CPU

68000

IC4

Z80QFP

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r . .

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n.

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t/

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IC2

LHP8323

52

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'./

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uo

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d

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OR

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7

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DATA

BUS

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AC-

v

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1

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j

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L--------------------------------------------~--------------------------------------------------------------------~

A

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PADI

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PLAYER

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-3-

CONTROL

PADI

2

PLAYER

J

Option

c

D E

F

-4-

G

2

3

4

5

6

H

3.

SCHEMATIC DIAGRAM

1

2

3

4

5

6

3-1.

Schematic

Diagram-1

IC7

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