Sega SC3000 User manual

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Personal Computer

SC-::3000

Setvice Manual

M

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I

SEGA ENTERPRISES,

LTD.

1.

SC-3000

SERVICE

MANUAL

2.

EXPLANATION OF

THE

ATTACHED

PARTS

LIST

(ABBREVIATIONS,

ETC.)

In

the

attached

parts

list,

the

column

for

the

description

of

parts

has

limited

digits

(for

computer

input)

resulting

in

some

insufficient

expressions.

The

main

abbreviations

used

are

given

below:

(D

Capacitor

Expressions

are

given

in

the

order

of

materials

(type),

capacity,

tolerance

and

voltage

resistance.

a.

Materials

(type)

CERA

.....

Ceramic

capacitor

ELECT

•...

Electrolytic

capacitor

MYLAR

•...

Polyester

film

capacitor

b.

Capacity

0.1

U =

O.lf

F

470P

=

470pF

c.

Tolerance

J =±10%

K=±5%

Z=+aO%

,

M=±20%

-20

-1-

@

Resistance

Expressions

are

given

in

the

order

of

material

(type),

resistance

(..0--),

tolerance

and

allowable

output.

Example:

CARBON

R H

IK

(Resistor)

(Horizontal)

(V

•••

Vertical)

Q)

Others

TR

D

V

Transistor

Diode

Variable

Resistor

SEMI

VR

....•

Semi-fixed

resistor

-2-

J

l/4W

SC-3000

SERVICE

MANUAL

-CONTENTS -

1.

CONFIGURATION (INCLUDING

CIRCUIT

DIAGRAM)

2.

SPECIFICATIONS

(CARTRIDGE SIGNAL TIMING CHART)

3.

BLOCK

DIAGRAM

4.

EXPLANATIONS

OF

DEVICES

5.

IC

TERMINAL CONKECTION

(INTERIOR

BLOCK

DIAGRAM)

6.

ASSE~BLY

DRAWING

7.

PARTS

LAYOUT

DRAriING

8.

LIST

OF

PARTS

-3-

11>4

di:

:·

'~

7 J

(l

i 74 ><(04

'"

C

NQ

/EXPANS

lt.

N

8..;v

-,.,;;v B I

-t

sv

B 2

OS-RAP

B 3 - - -

-~

~

B 4

r------

ME

1,1R

B 5

1--

--1--

- , 1

t-1

E

MW

B b

1--

--l

e----

~ r

J/0

R· B

'J

t--~t---

1/0W

B 8

>----<>--~•

N.

C.

B 'l

~

1-\REQ

Bio

" -

t---

4--'-

--<

~

cij

C&N

1/'1

EiisT

a'.~

CASi

w

P<'.

RAMA'1

Q.

<(

iMTT

~

'1-CASj

..._,

'-

MUX

Al4

AIS

t-J,C .

GND

GND

A O

Al

AZ

A 3

A4

"'

AS

U1

(,l

-

As,

A7

r\

...

(/)

AB

G>

VI

p!

uJ

a'.

C,

"'

_J

~

0

0

J

(/)

.__,

AQ

Aro

A

II

A

12

At3

00

0 1

{) 2

{)

3

04

n

i:;

Db

t>

7

B

11

812 t------

813 t------

-

B14

r----

Bl~ t------

811,

t------

8 17

Bl~

i---.

Bl'!

t---.

B~

e:u

ti

en

A

I

A 2

I--,

A

3

I----

A

41----

A

51----

A 6

1----

A

71-------

A

g

1----

A

q

i---

A.

Io

I----

A II

1-------

A

12

I--,

A1

3

~

Al4

__,

A15

A

lb

Al1

Al8

AI'!

A2

0

A21

-

A22

___,

CH4(

CASS

'E

T

TE)

~

IC. I

r

Pll

Z -

fi>OA

r--9<

NM"J

..-

h-

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Cl.

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GND

L.

CON~IGURATION

AS

PBR

THE

CIRCUIT

DIAGRAM.

1-1

CPU

1-2

Video

Processor

1-3

Sound

Generator

1-4

I/0

Interface

1-5

Built-in

RAM

2.

SPECIFICATIONS

2-1

DC

input

voltage

2-2

Audio-Video

terminal

Z80A

(

CLOCK

3.

579545

MHz

-

N'l'SC)

3.58

MHz-----

PAL

:

TMS9918

(NTSC)

TMS9929

(PAL,

RGB)

SN76489AN

8255A

2K

Bytes

DC

9V +

0.SV

850mA

Minimum

ripple

voltage

to

be

more

than

7.5 v

as

shown

below.

/VVV'

OV-----~t

7.5V

(NTSC, PAL} : 5

PIN

DIN JACK

Pin

No.

Siqnals

1 AUDIO-OUT

2

GND

3 COMPOSITE-OUT

I 4

GND

5

GND

-6-

2-2-1

AUDIO -

OUT

Allowable

load

impedance

Output

level

2-2-2

COMPOSITE -

OUT

Recommended

load

impedance

Allowable

load

impedance

Output

level

:

0.

9

VP-

P +

0.

1 V

-

(White

level)

(RGB) 8

PIN

DIN JACK

:

More

than

l0K.Il.

lV

max +

0.

2V

:

75

..0..

More

than

70

PIN

NO.

SIGNALS

l

AUDIO

2

GND

3

SYNK

( 4

HSYNK

5

VSYNK

6 R

7 G

8 B

2-3

Video

RF

terminal

(NTSC) :

RCA

pin

jack

Output

f_requency

JIS

Channel

1

(L-CH)

Channel

2 (H-CH)

Output

Impedance

75.n.

(PAL)

:

RCA

pin

jack

Output

frequency

Table

1

Output

impedance

75

..n_

-7-

Table

l

Voice

TYPE

Outout

freouencv

Freauency

G-PAL

CCIR

36CH

(591.25

MHz)

+5.5

MHz

I-PAL

CCIR

36CH

(591.25

MHz)

+6.0

MHz

13-PAL

Australia

3CH

(86.25

MHz)

+5.5

MHz

(Australia)

Australia

4CH

(95.25

MHz)

I

+5.5

MHz

t

B-PAL

New

Zealand

2Cli

(55.25

MHz)

)

l

+5.5

MHz

i

(New

Zealand)

New

Zealand

3CH

(62.25

MHz)

;

+5.5

MHz

'.

13-PAL

CCIR

3CH

{55.25

MHz)

!

+5.5

MHz

(Southeast

Asia)

4CH

(62.25

MHz)

+5.5

MHz

'

2-4

Cassette

interface

terminal:

3.5~

2P

mini-jack

Output

level:

20mV

P-P

+

5mV

Input

level

:

More

than

lVp-p

I/O

form

As

per

ROM

pack

software

2-5

Printer

interface

Optimum

form:

L=l200

Hz

H=2400

Hz

1200

baud

7

PIN

DIN

jack

Pin

No.

Connection

Signals

as

per

SC-3000

BASIC

1

8255

PBS

FAULT

2

8255

PB6

BUSY

3

8255

PCS

DA'I'A

4

8255

PC6

RESE'I'

5

I

8255

PC7

FEED

6

GND

GND

7

NC

NC

I/O

level

:

TTL

FAN-OUT

*l

TTL

I/O

form

Serial

(As

per

ROM

pack)

*(Note:

this

is

1

an9

not

I)

-8-

2-6

JOYSTICK

1 2

3

4 5

0 C O O 0

0 C

O 0

6

'7

8 9

Pin

No.

1

2

3

4

5

Connection

XO

Xl

X2

X3

NC

2-7

ROM/RAM

Cartridge

slot

Pin

No.

Siqnal

Pin

No.

A

1

A

0 (ADDRESS

0)

B

1

A

2 A 1 (

Ii

1)

B 2

A 3 A

2

( II

2)

B

3

-

A 4

A

3 (

II

3)

B

4

A 5 A 4

(

II

4)

B 5

A 6

A

5

(

II

5)

B

6

A

7

A 6

(

II

6)

B

7

A

8

A

7

(

II

7)

B

8

A

9

A

8

(

II

8)

B

9

Al0

A

9

(

n

9)

B10

All

Al0

(

II

10)

B11

Al2

All

(

II

11)

B12

Al3

Al2

(

II

12)

Bl3

Al4 Al3

( "

13)

B14

Al5

D

0

(

DA'rA

0)

Bl5

Al6

D

1 (

II

1)

B16

:

Al7

l D

2 (

II

2)

1317

Al8

D

3 (

II

3)

Bl8

Al9

D

4

( "

4)

Bl9

A20 D 5 ( " 5 ) B20 '

A21

D

6

( "

6)

B21

'

'

A22

D

7

(

II

7)

B22

-9-

Pin

No.

Connection

6

)(4

7

NC

8

Y7

I

9

XS

Signal

+ 5V

+ 5V

DSRAM

CEROM2

MEMR

MEMW

I/OR

I/OW

NC

MREQ

CON

RASl

--

CASI

RAMA?

RAS2

CAS2

--

MUX

Al4

Al5

NC

GND

GND