Sega GENESIS II Manuale utente

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SERVICE

MANUAL

GENESIS

/MEGA

DRIVE

(PAL-8/1/G, RGB)

NO.

001

ISSUED JUNE, 1993

CONTENTS

1. SPECIFICATIONS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3

IDENTIFYING PARTS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 4

DISASSEMBLY · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 6

BLOCK DIAGRAM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 7

5. SCHEMATIC

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

CIRCUIT BOARD

DIAGRAMS···

· · · · · · · · · · · · · · · · · · · · · · · · · · · 12

PARTS

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

EXPLODED VIEW & PARTS LIST · · · · · · · · · · · · · · · · · · · · · · · · · · 28

8-1. EXPLODED

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

8-2. MECHANICAL PARTS LIST · · · · · · · · · · · · · · · · · · · · · · · · · · 28

8-3. ELECTRICAL PARTS LIST · · · · · · · · · · · · · · · · · · · · · · · · · · ·

8-4. ACCESSORIES/PACKAGE

LIST·······················

Sega Enterprises, Ltd.

Before Using This SeNice Manual

This service manual includes data for the GENESIS

and MEGA DRIVE

• Pans of

the

circuits are different

the

GENESIS

depending

the model of

(RGI3

encoder used).

Check

the

model of ICII

the

main

circuit

board

and

identify the type,

S or

SM.

Type

Model

IC11

Part

No.

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

CXAI

145M-T6 SOP 313-5213-A

KA2195D 313-5236-A

IC1

CN3

IC6

MAIN C.B (Top View)

• Differences

the circuits are shown

the difference tables

the schematic

and

circuit board diagrams.

•

the parts

list,

differences are shown

the REMARKS columns.

1. SPECIFICATIONS

RATINGS

MEGA

DRIVE

Model

GENESIS

PAL-l

PAL-8

PAL-G.

RGB

Power input AC 120V, 60Hz AC220V, 50Hz, AC 240V, 50Hz i AC 220V, 50Hz

Power consumption

18W

w I

ISW

Usable temperature Humidity 5-35

, 20-80%RH (non-condensing)

Dimensions

220

(W)

X 212 (D) X

(H) mm

SPECIFICATIONS

CPU

68000 (8M) & Z80A (4M)

RAM

72k

bytes

Memories

VRAM

64k bytes

Audio FM,

PSG,

PCM

VDP

SEGA custom LSI

Display Regular color

Display capability Colors 512

Video

outputs

VIDEO

RGB

Control terminals

control

pad,

etc.

can

attached

Reset

button

Game

restart function

Slots For cartridge

and

extension

* Design

and

specifications

are

subject

change

without notice.

IDENTIFYING PARTS

2-1. FRONT & TOP VIEW OF CONSOLE

CONSOLE

Power

Button

Directional

Button

(D-Button)

CONTROL

PAD

2-2. BACK VIEW OF CONSOLE

Reverse

Side

A/V

OUT)ack

Extension

Compartment

Cartridge

Slot

Reset

Button

Power-On Indicator

Control

Port

Control

Port

Start

Button

AC Adaptor

Jack

OUT ADAPTOR

2-3. ACCESSORIES

GENESIS

RFUnit

SEGA AFUNIT

J.«X>B.

NO M<>1632

.SC-M

f'IA)

CH3-CH4

~VN

Cii~Elec;T

MEGA DRIVE

Unit

SEGA

UNIT

(Except French model)

Adaptor

Except

U.K.

)

Austraria

and

New Zealand

Adaptor

Peritel Cable Sega 16-bit

Game

Canridge

(French

model

only) (Provided or

Sold

separately)

(U.K.) (Australia

and

New

Zealand)

DISASSEMBLY

3-1. Dismantling procedure

Removal of bottom screws and top case

I) Turn

the

power button off.

Turn the unit over. (See

Fig.

3) Remove four screws (202).

4) Remove top case

Main board removal (See Fig. 2)

I) Remove nine screws (20I).

Remove the shield plate.

Remove two screws (203).

Remove the

main

board from the bottom case

(2).

3-2. Reinstalling procedure

Main board reinstallation

I) Attach the 64-pin cover (8).

Attach the main board

the bottom case.

3) Tighten

two

screws (203).

4) Attach the shield plate.

.5)

Tighten nine screws (201).

Top case reinstallation

Turn off the tactile power switch (TACT SW)

the main board.

Attach the top case.

Engage the top case with the bottom case.

Tightening the screws on the bottom

case.

I) Turn the unit over. (See Fig. I)

Tighten four screws (202).

201

?-202

Fig. 1

f-"201

Fig.

BLOCK DIAGRAM

PERIPHERAL

DEVICE

(~g~=~~~:

ANTENNA

GAME

CARTRIDGE

"'17'

r--

------------------------- --------------------

------------------------------------------------------------------~

L-

IC7.

ICB

~P041264

V-RAM

64KB

OSCl

53.

203424M

!MEGA

DRIVEn>

IC6

ICll

53.

o93!75

(GENESIS

II>

ZCLK:

5MHz

VCLK:

oMHZ

FC!004

M83514

VIDEO/

E[lCK

MCLK

AUDIO

CN3

C64P>

VCLK

CN2

C60P>

osc

EDCK

RGB/

SYNC

r--

ZCLK

< r

;1;1

VCLK

ICl

e:i~

131

68000CC

II I

II~

RGB

ENCODER

VDP

ADDRESS/CONTROL

BUS

llo

bit>

-v

or---

-,/

CNl

~;,

·~

~;,

" ::>

1--

r--

rv-

DATA

BUS

(!b bit> 1

PSG

RGB/SYNC

CPU

68000

<(;:,.

,(;..

! v JI

1--

......

.!..---

t--

IC6

' 7

MIX

FC!004

IC6

FC!004

MCLK

EDCK

ZCLK

7 v R

BUS

VCLK

RAM

ARBITER

V1:

I/0

EDCK:

MIX

64KB

~1/0.

ZTOV.

VTOZ

13.

3MHZ

IC2.

IC3

.),.

•

PD42832-15

IC4

ZBOQFP

,("-

ZCLK

,..,.1

....

IC6

b~b

IC12

,~~

FCI004

SOUND

SOURCE

TA7805HF

/I. "

ADDRESS/CONTROL

BUS

REGULATOR

cPu

zao

l'r

~;,

0/A

CONVERTER

DATA

BUS

bit>

n -v

ICS

•PD4304CX-15

RAM

8KB

ONS

CN6

-------------------------------------------

----------------------------~------------------------------------------

!CONTROL

PADI

CONTROL

PAD

PLAYER

OPTION

1 2 3 4 5 6

UNIT

VIDEO/AUDIO

AUDIO

;

RGB

IOV

850mA

ADAPTOR

......

' c

AC~

SCHEMATIC DIAGRAMS

5-1. SCHEMATIC DIAGRAM-1

IC7

I/01

lDO

I/02

I/03

I/04

SDO

SI/01

SI/02

SI/03

SI/04

sc_

BAa.

~iiE

tiL.

SOE

ZJ:P

ICB

I/0~

AD4

I/02

I/03

I/04

SI/01

SI/02

SI/03

SI/04

sc_

BAa.

!all

QLIOE

RiB:

NOT

USED

R.O.fH

CAS1

o..:1

vc~;a

F87

tiL.

SOE

ZLP

lp;;p

NOT

USEI

1t"

.~o

1f;~P

1t"'!~o"

HS601

VCLI<

IC~

rvii:A

IPLO

27.

IPLO

IPL1

IPL2

BGAK

R74F~~O

_.G..

BGACK

OTACK

SERA

FCO

FC1

FC2

VMA

HALT

RESET

UDS

LD:t

R/W

seooocc

::f:::

220P

NOT

USED

....-·A3

·;A7

:,:~~

..~

VA13

-u

-1'15

II'

./.6.17

-'At8

~i~

-'A21

;A22

.6.23

•.

oto

011

012

013

014

.::_ot5

cs2

~pooP~

IRtS

2.2K

.,.

'Lr!~;-~

I I

_·..:::r

RAB

2.2KO'!~

c~~,~01

I CAP

ARAV

33Ptt16

IC2

A10

A12

A13

A14

,,..,n

:>o

liE.

NOT

USED

CAi

:::j'

33P

r--1-

;.;..;

NOT

U!SEO

Jis

n~t~!

YNNL

SCCK

FS13

IC"'

A10

A12

A13

At4

RASO

liE.

ovr•

•

,.,

.,,.

WAIT

HALT

WAIT

l.::::eEINi:T=1ttl2

INT

NMI

ZRES

RESET

ZBR

SUSRQ

8USAK

ZCLK

N.C.

ti7

.L,z..,..eo;;;"""""P----1

FC1004

(SGE]

R12

2.2K

R10

2.2K

R11

v~ftft+ftnl

·~•

v•

r·

....,

""'

.----

.;~~

F=:

VC!;:1

r.7

F=:

;;

f;:

33P

r.7

::f::

~~OF

r,l-]

4.7K

vc;~t

....

......

l£6JJi.

CASO

voo

V01

V02

V03

V04

vos

VO&

V07

voe

VOS

V010

V011

VD12

V013

VDt4

laWS

BQtl_

dEL.

a.s2

FDC

FRES

.UL

SR3

6211

SR2

DisK

VAl

VA2

VA3

VA4

VAS

VA7

VAS

VA8

VA10

VA11

VA12

VA13

VA14

VA15

VA18

l£A.l7

WIS.

WIS-

C6D.

FDWR

VA!.S

627

SL3

S2S

SL2

VAS

VAU

VA7

VA12

VA&

VA13

VAS

VA14

VA4

VAtS

VA3 ·

VA16

VA2

VAt7

VAt

V07

VDO

VDB

VD6

VDt

VOS

VDS

VD2

VDtO

VD4

VD3

VD1t

SL.J._

MRES

SRt

VAS

VA18

VA19

VA20

VA21

VA22

:a__

HSVNC

CAaP

DIAlS.

CAS2

V015

VDt4

VOt3

:ilU.2.

WIS.

W!FI

tQ_

I.ll£.

CART

t;;ON

*DIFFERENCE TABLE FOR DIAGRAM-1

CIRCUIT GRID GENESIS

MEGA DRIVE

No.

OSCI C-5 53.693175MHz 53.203424MHz

C9 E-7 NOT USED 47P

CIO C-5 NOT USED lOP

Cll

B-4 NOT USED 33P E

5-2. SCHEMATIC DIAGRAM-2

I-

- - -

:[£.i_

-l

IC2 IC3

1--

~I'J_;3_-

-1

I - - -

_C~2-

- - - l

:~;

:~:

I ·lvccs vccs I +SlY vccs

ikk

VCC1 VCC1

I I I I I

:~~

'pi

I C311 I I

o.oaau

'F'

I I I I :f

o.o~

1..:..

__1

___

__l

Cl!:27 •

1%28

••

47u

0.0112U

IC5

OSC1

:~:

----I

:~1

I I I I I

'p''p'

I I

~---

----

o.oaau

o.ou..1

______

I I I I L

_________

___

__l

I I

I_---

- - - - -

..1

~6-

- - - - l

:•t-=

C47

.022u

A73

IC4

r - -vc-;s - - 1

I I

sou

.ORI!u

J I

,I I

_____

IC7

I-

-v~s--

I I

_____

r -

l.C_l3_-,

~pel

Rllu

I I

_____

'--------

------------,

I I-""

411

T10u

•••

,_,_

---------------------------------

1 2 3 4 9

5-3. SCHEMATIC DIAGRAM-3

l_C_11_

vvcc

~L:

b::

100u

CN1

-;~cc:-

- - - ;

EH3

I I

r·;;u2e

,..

I I

_____

CN5

~-------------------,

vcf

- - -

I I

I * I

e~ll

:J 0 I

GENESIS D : :

L - - - - - - - - -

_I:-

---.:

_::

CN6

I I

___

~---------,

I VCC1

:~:

*DIFFERENCE TABLE FOR DIAGRAM-4

CIRCUIT GENESIS

No. GRID MEGA DRIVE

TYPE-F TYPE-S TYPE-SM

IC11

E-6

MB3514PF-G-BND-EF CXA1145-T6 SOP

KA2195D

MB3514PF-G-BND-EF

E-7

100

NOT

USED

IOO.u

D-7

NOT

USED

D-7

NOT

USED

NOT

USED

NOT

USED

100

CE14

D-6

220

IO.u IO.u

220

C28

E-7

l8P (CH)

18P

(CH)

NOT

USED

l8P

(CH)

C29

D-7

0.01

NOT

USED

0.01

C30

D-7

I80P (CH) I80P

(CH)

NOT

USED

I80P

(CH)

C32

E-6

ISP (CH)

180P

(CH)

NOT

USED

15P

(CH)

C57

D-5

lOOP

(CH)

NOT

USED

NOT

USED

lOOP

(CH)

C61

D-6

NOT

USED

NOT

USED

NOT

USED

0.1

C62

D-7

NOT

USED

NOT

USED

NOT

USED

12P

(CH)

R47

E-6

12K

1.2K

NOT

USED

12K

R54

D-6

,_.

NOT

USED

24K 24K

NOT

USED

R55

D-6

!OK

NOT

USED

!OK

R56

D-7

1.2K

NOT

USED

l.2K

R57

D-7

330 330

NOT

USED

R61

E-5

4.7K

!OK

IOK

4.7K

2 3

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