Sega Sc3000 User manual

Personal Computer

SC-::3000

Setvice Manual

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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-

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-t

sv

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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

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P<'.

RAMA'1

Q.

<(

iMTT

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'1-CASj

..._,

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MUX

Al4

AIS

t-J,C .

GND

A O

Al

AZ

A 3

A4

"'

AS

U1

(,l

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As,

A7

r\

...

(/)

AB

G>

VI

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a'.

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AQ

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A

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A

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At3

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t>

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B

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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----

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1-------

A

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I--,

A1

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A15

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5.

6.

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--t,

0

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:::0

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OJ

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

DIN JACK

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

DIN JACK

:

More

than

l0K.Il.

lV

max +

0.

2V

:

75

..0..

More

than

70

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

jack

Output

f_requency

JIS

Channel

1

(L-CH)

Channel

2 (H-CH)

Output

Impedance

75.n.

(PAL)

:

RCA

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

DIN

jack

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

7

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

No.

1

2

3

4

5

Connection

XO

Xl

X2

X3

NC

2-7

ROM/RAM

Cartridge

slot

No.

Siqnal

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-

No.

Connection

6

)(4

7

NC

8

Y7

I

9

XS

Signal

+ 5V

DSRAM

CEROM2

MEMR

MEMW

I/OR

I/OW

NC

MREQ

CON

RASl

--

CASI

RAMA?

RAS2

CAS2

--

MUX

Al4

Al5

NC

GND

I/0

level:

TTL

Fan-out

1T1

1

L

Timing

As

per

Fig.

2-1

r-

2-3.

2-8

Memory

map

0000

8000

8800

cooo

CBOO

FFFF

BASIC

ROM

FREE

AREA

INTERIOR

RAM

FREE

AREA

BASIC

ROM

PACK

RAM

FREE

ARE.A

IN'fERIOR

RAM

FREE

AREA

BASIC

Ila

BASIC

IIb

2-9

I/O

MAP

--------

7

6

-

SN76489

(SOUND)

cs

X

-

TMS9918* (VDP)

X

cs

8255A

(

I/0)

X X

RESERVED

X i

X

BASIC

ROM

PACK

RAM

INTERIOF

RAM

FREE

AREA

BASIC

Illa

5

4 3

X

-

cs X X

- -

X cs cs

* TMS9929

applies

to

PAL

and

RGB.

-10-

2

X

-

cs

BASIC

ROM

PACK

RAM

--------

PACK

RAM

~---------

PACK

RAM

BASIC

IIIb

l

0

X X

X

MODE

X X

¢

CARTRIDGE

TIMING

CHART

(1/3)

( 10ns

/mm)

MI

CYCLE

A

OP

FETCH CODE

o---

,r-y---------,r-x

Ao~A1,

,",

X ________

__,\

___

fL

f,

______

_

PROGRAM

COUNTER

REFRESH

ADDRESS

Do~D1

.

----c=}----

RD

WR

MREQ

RFSH

I/OR

I/OW

MEMR

MEMW

CEROM

DSRAj\'f

MUX

I

ROM

SRAM}

FROM

OE

270ns

SRAM}

ACCESS

TIME

ROM

375ns

290

ns

DRAM

tRAC

I

tCAC

140

ns

I

I I I

r

I

-11-

CARTRIDGE

TIMING

CHART

(2/3)

(1

Ons

/ mm)

B.

MEMORY READ -OUT

/WRITE

CYCLE

(

MEMORY

READ

OUT

CYCLE)

(

MEMORY

WRITE

CYCLE)

T1 T2

Ts

¢

~

L_J

i.______,

TJ--~

0

\/

z x

_____

_

Ao

~A15

i..,,__J\_

________________

__

t:,

__

~,"

___________

__._...._

__

_

IORQ

RD

WR

MREQ

I/OR

I/OW

MEMR

MEMW

CEROM

DSRAM

MUX

----c::::J----

:i~\1}

FROM

OE

MAX

370

ns

1·

·:

SRAM

tWP

MAX

----------+------------,1'"

290

ns

•

l.~---

1

I

S

RPOAMM}

ACCESS

TIME

520

ns

,

SP

AM

FROM

WE

MAX

670

ns ,

l

I

--.-I

- - - - - - - - - - - - - - - - - - I

~!_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_

~_,-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-.--

-

I

I I

I

DRAM

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MAX

I I I

I I

I

tCAC

MAX

255 ns

...__

____

_,1

-12-

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WR

MREQ

RFSH

MNIN

IOR

I/OW

.:VIEMW

I

CARTRIDGE

TIMING

CHART

(3/3)

(1Qns/mm)

C :

I/

0

READ/

WRITE CYCLE

READ

OUT

CYCLE

WRITING

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HYBRID

IC

{CASSETTE)

(WAVE

SHAPING>------<r-.

11--1

(Fig.

3-2)

SC-3000

(PAL)

BLOCK

DIAGRAM

-14-

4.

EXPLANATION

OF

D8VICES

4-1

CPU

(CONTROL

PROCESSING UNIT)

Z80A or

fl.PD780-l

Q)

CLOCK

SC-3000

(NTSC) -

3.579545

MHz

SC-3000

(PAL) -

3.58

MHz

o

The

CPU

CLOCK

of

SC-3000

(NTSC)

uses

a

CPU

CLOCK

output

(10.738635

MHz/

3)

i.e.

3.579545

MHz

for

VDP

(TMS9918).

Also,

this

is

used

as

the

color

subcarrier

frequency

under

the

NTSC

system.

o

The

output

for

the

CPU

CLOCK

of

SC-3000

(PAL)

can

not

be

obtained

from

VDP

(TMS9929)

and

therefore

it

is

supplied

from

the

CLOCK

OSC

("CERALOCK":

3.58

MHz)

II

4-2

V.D.P.

(VIDEO DISPLAY PROCESSOR)

TMS9918,

TMS9929

@ TMS9918 (NTSC)

CERAMIC

OSCILLATOR

This

is

a

V.D.P.

based

on

the

NTSC

system

and

has

a

16K

byte

VRAM.

TMS9918

generates

the

color

subcarrier

in

the

IC.

So,

an

adjustment

of

CLOCK

to

10.738635

MHz

is

required.

@

TMS

9929 (

PAL

)

Functionally,

this

is

similar

to

TMS9918.

However,

while

TMS9918

has

a

composite

output,

TMS9929

has

3

kinds

of

outputs,

i.e.,

B-Y,

R-Y

and

Y.

Thus,

color

modulation

needs

to

be

made

outside

the

VDP.

-15-

Also,

in

the

case

of

9929,

the

subcarrier

is

not

generated

in

the

IC.

So,

CLOCK

frequency

adjustments

are

not

necessary.

4-3

CUSTOM

IC

(gate

array)

This

has

functions

to

prevent

RESET

signal

chattering

and

from

CPU

signal

(MREQ, RD,

WR,

IORQ,

RFSH,

A6,

A7,

Al4,

Al5)

to

generate

CS

{chip

select)

signals

of

S-RAM,

SGC

and

VDP

as

well

as

to

generate

control

signals

of

exterior

ROM

and

exterior

D-RAM.

4-4

S-RAM

This

has

a

memory

of

2K

bytes

(2K

x 8

bit).

4-5

S.G.C.

(SOUND

GENERATION CONTROLLER)

SN76489

IC

for

sound

generation

4-6

P.P.I.

{PROGRAMMABLE

PERIPHERAL INTERFACE)

8255

This

is

the

IC

for

the

interface

and

carries

out

keyboard

scanning,

joystick

scanning,

printer

signal

control

and

cassette

signal

control.

4-7

KEYBOARD

Refer

to

the

separate

key

matrix

drawing

(Fig.

4)

4-8

Hybrid

IC

This

is

the

hybrid

IC

which

carries

out

cassette

signal

wave

shaping.

This

IC

has

an

attenuator

of

20

dB

for

output.

For

input,

signals

from

the

cassette

tape

are

shaped

to

square

waves.

At

the

following

levels

and

corresponding

frequencies,

the

1200

bit/sec.

signal

is

transmitted:

0:1200

Hz

1:2400

Hz

-16-

4-9

RESET

CIRCUIT

This

resets

the

CPU

and

VDP

when

the

power

is

turned

ON.

4-10

REGULA'rOR

This

is

operated

by

the

logical

circuit

of

5V

stabilized

(7805H)

power

source

only

(except

for

PAL).

4-11

VIDEO

MODULATOR

circuit

The

VDP

(TMS9929)

under

the

PAL

system

has

no

VIDEO

composite

output

and

instead,

color

difference

signals

of

3

kinds,

i.e.,

the

Y,

R-Y

and

B-Y

are

output.

In

this

circuit,

PAL

composite

video

signals

are

converted

from

the

signals

of

Y,

R-Y

and

B-Y,

and

also,

amplification

of

6 dB

(approximately)

is

carried

out

as

the

signal

output

of

LM1889

is

insufficient.

4-12

DC-DC

converter

circuit

(PAL)

This

circuit

is

used

as

the

DC-DC

converter

(PAL)

of

9V-12V

became

necessary

due

to

the

specified

power

source

voltage

range

of

12V

for

the

IC

LM1889

used

for

VIDEO

MOD

converter

circuit.

4-14

RF

MOD

The

RF

MODULATOR

has

2

systems,

i.e.,

the

NTSC

and

the

PAL,

as

specified

below.

o

NTSC

1.

VHF'

C

ha,nrie

I

CH

1

CH

2

fp:

Image

frequency

fs:

Sound

frequency

+P

91.25

MHz

+s

-

+f

44.5

MHz

97.25

MHz

44.5

MHz

-17-

Scf)111\i'Yl~ I

i'l'l-eS

525

lines

525

lines

o

PAL

UHF

{1·

G-PAL CCIR

36

CH

591.25

MHz+

5.5

MHz

625

lines

2.

I-PAL

CCIR

36

CH

591.25

MHz

+

6.0

MHz

625

lines

3.

B-PAL

3

CH

86.25

MHz

+

5.5

MHz

625

lines

(AUSTRALIA)

4

CH

95.25

MHz

+

5.5

MHz

625

lines

VHF

4.

B-PAL 2

CH

55.25

MHz

+

5.5

MHz

625

lines

(New

Zealand)3

CH

62.25

MHz

+

5.5

MHz

625

lines

5.

B-PAL

3

CH

55.25

MHz

+

5.5

MHz

625

lines

(Southwest

4

CH

62.25

MHz+

5.5

MHz

625

lines

Asia)

-18-

(Fig.

4)

SC-3000

KEY

MATRIX

I I

----------------------1

FNC.

.~~

RST

* c

N·rsc

>

ALPHANUMEH.ICS

(PAL•

RGB)

ENG

DIER

I

S

-19-

Sega SC3000 User manual

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