Sega Saturn Service Manual

llfliA"

SERVICE

SEGA SATURN (PAL)

MANUAL

NO.

ISSUED

013-

JUNE,

CONTENTS

1.

SPECIFICATIONS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3

2.

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

3.

ACCESSORIES· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 5

4.

IDENTIFICATIONS AND LOCATIONS OF CIRCUIT BOARDS · · · · 5

5.

DISASSEMBLY

PROCEDURE·································

1

1995

6

6.

CD DRIVE MAINTENANCE AND ADJUSTMENT· · · · · · · · · · · · · · · · 8

7.

BLOCK DIAGRAM · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

8.

SCHEMATIC DIAGRAMS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

9.

CIRCUIT BOARD DIAGRAMS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

10. PARTS SPECIFICATIONS

11. EXPLODED VIEW & PARTS LIST ·

11-1. Exploded
11-2. Mechanical Parts List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
11-3. Electrical Parts List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 72
11-4. Accessories/Package list · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 77

View···········································

..

···

.. · .. · ..

..

· ·

···

....

·····

..

..

· ·

...... · .. · ...... · ..

····

.. · ..

Sega Enterprises, Ltd.

11
13
27

32
70
70
71

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

This

set

employs

Warning

When

servicing,

Be

sure

to

observe

laser.

do

from

Therefore,

not

approach

a distance of

the

be

sure

laser

more

to

exit

than

follow

with

30

carefully

the

eye

em

from

too

the

the

closely.

instructions

In

surface of

below

case

the

when

it

is

necessary

objective

servicing.

to

lens

on

confirm laser

the

optical

pick-up

beam

emission.

block.

£ Cautio"' Invisible laser

Caution

Use

of controls or adjustments or performance of procedures other

radiation

This

exposure.

console

is

classified

as a CLASS 1 LASER

radiation

product.

when

SAFETY PRECAUTIONS

Notice:

I.

'

3.

PRODUCT SAFETY NOTICE

Many
inspection

voltage, wattage,
Electrical components
of a substitute replacement component
replacement
continuously under

Comply

When

replacing a chassis

knobs,

adjustment

When

service

the

high

voltage circuit.
Always
should
that

use

not

indicate evidence of overheating.

electrical

nor

with

all

cautions

in

and

compartment covers/shields, isolation resistors/capacitors,

is

required, observe

the

manufacturer's replacement components. Especially critical components

be

can

one,

replaced

and

etc.

shown

by

other manufacturer's. Furthermore, where a short-circuit

mechanical

the

protection afforded

Replacement parts

having

in

the

review

and

the

console,

parts

such

features

parts list
new

and

safety

related

notes

all

the

protective devices

the

original lead-dress. Extra precautions

have

special safety-related characteristics. These are

by

them

necessarily

which

have

these special safety characteristics

are

which

in

this

instructions

identified

does

Se[Vice
are

not

Manual,

issued

by

have

open

located

be

marking

the

from

time

and

interlocks

than

on

or inside

must

obtained

with

a it,

same safety characteristics

may

create shock,

to

time.

defeated

those specified

the

cabinet

be

put

back

etc.

should

has

by

using

replacement components

in

the

parts

fire,

in

place,

be

taken

occurred, replace those components

are

avoid exposure

herein

and

on

the

such

to

assure correct

as

indicated

often

identified

list

in

this Service
as

or other hazards. Product Safety

to

beam

may

result

in

chassis.

as

barriers, non-metallic

lead

on

the

circuit diagram

not

in

this Service

the

SEGA

evident

from

rated

Manual.

recommended

hazardous

dress

visual

for higher

Manual.

The

in

use

is

CAUTION ON FUSE

Caution:
Attention:

For continued protection against risk of

Afin
par

REPLACEMENT

d'assurer

un

fusible

8 This symbol indicates a

.8.

This symbol indicates a Time

une

protection permanente contre

de

meme

type

et

de

amperes

Fast

Operating Type Fuse .

Lag

fire,

Type

replace

volts.

Fuse.

-2-

only

with

same type, amperage, volt

tout

risque d'amon;age electrique, replacer uniquement

fuse.

Audio CD:

SATURN

COMPATABILITY

The normal audio Compact Disc
altered with all the effects

of

is

playable on the Saturn machine, and can

be

a modern Hi-fi and more. Surround sound, vocal
cut-out for Karaoke, program sequence of tracks and shuffle to name but a few.
You need no extra equipment

to

play music CDs on your Saturn.

CD+G:

CD and Graphics are a format where simple visuals can appear on the screen
that relate

pictures. You need to buy

to

the music. These visuals might include stills of the band, or other

no

extra equipment to use CD+G on your Saturn.

CD+EG:

CD

and extended graphics is a new medium ready
community. It is basically an enhanced version of what
CD+G. You need no extra equipment to use CD+EG on your

to

be utilised by the music

is

described above in

Saturn.

MPEG:

MPEG is the standard industry format for compressing Full Motion Video
footage. This means that the footage takes up less disk space, and when it is
be viewed, the MPEG program decodes the footage and plays it on screen. The

to

MPEG add-on is needed in order

of

At the current rate

compression one movie can fit on two CDs.

use the MPEG video CDs and Philips CDi.

to

',

I

Developed by Philips, CDi is an interactive CD format that can be used in a
variety
quality sound CDi has become an industry leader in the field

of

educational and entertainment purposes. Using video footage and CD

of

interactive

fun._

The MPEG add-on is required to access the full range of CDi software

Kodak Photo CD:

Photos stored on CD have theoretically infmite life, are always picture perfect

and will never fade or be otherwise damaged. The

Photo CDs with the use

of

another Saturn CD which allows the user to see
display the photos in various ways. There are many Kodak
open in the major cities.

Saturn can access Kodak

Photo CD stores

Frame Buffering: A technique

by letting the graphics processor chip

already calculated, allowing it
of a seconds visual images, all while the screen is still busy painting

of

the last fraction

Playfields: The background(s), anything that is on screen that it not a .

sprite. When two playfields (layers of bacground) are contolled

a second's display.

to

maximise graphic display performance

"set aside" images

to

work on enerating the next fraction

it

has

properly, parrallax scrolling can result.The

chip dedicated
Display Processor
background at the same time.

Polygons/Second:

can be drawn on the screen in one second. This figure does not
include the size of the polygons, nor their texturing, shading,
lighting.

to

controllingbackgrounds (the VDP2 or Video

2") that can generate 5 distict layers of

(1000's of) The number

of

Sega Saturn has a whole

polygons

of

a given size that

or

Realtime: An important adjective that usually indicates the game display

is being re-calculated every second, taking into account the
effects
or speed, it means the game responds instantly to the player's
commands.

of

the player's actions. When reffering

to

a game's response

full

Render: Drawing 3D graphical objects on a computer or game machine.

"BUG" and "Clockwork Knight" are filled with beautifully rendered
characters.

Texture Mapping: Copying a bit-map onto the faces of selected polygons

to give the illusion of surface texture.

of

example

a texture mapped game.

"Daytona USA" is a great

Wireframe: A connect the dots approach to showing graphical objects by

drawing lines between sets of points that make up a geometric
outline.

Dynamic

Perspective: Constantly changing the point

angle")
the on-screen action. Typically requires strong scaling and rotational
capabilities. This can be seen on

so that the players feel that they are weaving in and around

Sega Sports games on Saturn.

of

view ("camera

1.

SPECIFICATIONS

Ratings

Model

Power

supply

Power

consumption

Operating

Dimensions

environment

Specifications

CPU

Memories

MK - 80200-50

AC220-240 V 50/60
Approx.

Temperature 5
HumiditylO%

260
(10.2 inches) x

Master
Slave 32bit
Sound
Work
Video
Sound
CD

Buffer

IPLROM 4Mbit

20W

mm(W) X 230

RAM

RAM

RAM

RAM

°C

to

35

to

80%

mm(L) X 83

(9.0

Hz

°C

RH

(no

inches) x

32bit

68ECOOO

16

12
4Mbit
4Mbit

condensation)

(3.2

Mbit
Mbit

mm(H)

inches)

RISC
RISC

(11.3

SH2
SH2

(28.4

(28.4

MHz)

MHz,
MHz,

25MIPS)
25MIPS)

Backup
Resolution

Graphics Colors

Sprite Enlargement,
5 screen
XY

Scroll 4

Rotation

Scroll

CG

Functions

Sound

CD-ROM

Enlargement

Windo~

Special features

Polygons

Special features Flat

PCM & FM

Intelligent double-speed

RAM

maximum

I

reduction

sound

source

CD

256

Kbit

320 x 224

1024/2048

2

2

2

Vertical

Lateral

Enlargement

Specialized

Wire

shading

Gouraud

32

channels

16

bit
Sampling
AudioDSP

drive

dot

etc.

(16,770,000 simultaneous transmission)

cell

line

scroll

hardware

frame

shading

sampling

rate

Reducation,

scroll

I

reduction

44.1

kHz

Rotation,

max.

Transformation

[Note]

Characteristics

and

specifications

may

be

changed

-3-

without

notice.

2.

IDENTIFYING PARTS

2-1. Front View of Console 2-3. Control pad

OPEN

Button Cartridge Slot

RIGHT SHIFT Button

2-2.

ACCESS

CONTROL PORT 1 CONTROL PORT 2

Back

View

of

Console

Master Reset Switch

Light

DIRECTIONAL

Button START Button

2

POWER Jack

AN

OUT Jack

A Button
B Button
C Button

-4-

3. ACCESSORIES

Positive Side

B

Lithium Battery (CR2032)

AC Cable

[UK]

RGB

Cable

AC Cable [SOE] AC Cable [AUSTRALIA]

4. IDENTIFICATIONS AND LOCATIONS OF CIRCUIT BOARDS

CD

Drive Unit

P.

SW Board

Main Board

R.

SW

Board

-5-

Fig.

4-1

5.

DISASSEMBLY PROCEDURE

5-1. Top Case Removal

1)

Remove
direction of

six

screws ®

the

arrow.

Fig.

and

5-1

then

the

top

case

in

the

5·3. CD Drive Unit Removal

1).

Disconnect

2)

Remove

the

two

connectors

CD

drive

and

unit

in

the direction of

one

©.

Fig. 5-3

flat cable.

arrow

5-2. CD

1)

2)

3)

4)

Compartment

Remove
spring.

Remove spring © .

Remove
Push
release the

direction of arrow ®

ment

two

two

the lever

lid.

screws ®

screws@

in

the

boss

and

lid

Removal

and

then

the

bracket

and

then

the

oil

dumper.

direction of arrow ®

then

push

the lever

to

remove the

CD

compart-

lid

in

CD

to

the

5-4.

SH-1

l)

Remove four screws ®

plate.

2)

Remove screw
the

remove

SH-1

Board

board

it.

Removal

CD

and

release three tabs,

in

the

and

then

the

top

direction of arrow

shield

then

Q)

lift

to

Fig. 5-2

Fig. 5-4

-6-

5-5. Main Board Removal

1)

Remove four screws ® holding the CD drive

unit supports.

2) Remove five screws

© and then the main board.

Fig. 5-5

5·6. Power, Power Indicator and

R.

SW Boards Removal

I)

Remove three screws
board.

2) Remove screw
board.

3) Remove two screws

® and then the power indicator

If@

and then the power

@ and then the

R.

SW

R.SWBoard

board.

Fig. 5-6

-7-

6.

CD DRIVE MAINTENANCE AND ADJUSTMENT

6-1. Maintenance

I)

Checking the laser diode
As the laser diode wears out, the RF level
(amplitude
Check that the RF level
maintenance. If the RF level is less that
then the pickup should be replaced.

2) Variable resistor on the
The variable resistor attached to the pickup on the
APC board is used to adjust the output power
laser. This adjustment
can not be performed
output power
and should be replaced. Adjusting this variable
resistor may cause damage

of

of

Pickup

eye pattern) becomes lower.

is

0.8V - l.4Vp-p during

APC board

is

done at the facto!}' and

in

the field.

is

low, the laser diode has worn out

to

the laser diode.

If

0.8Vp-p

of

the

the laser's

6-2. Laser Pickup Replacement

Procedure

Turn the power switch
cord from the

AC outlet.

off

and unplug the power

1

Replace the pickup.

1

Set the door close detection switch
manually and turn the power switch on.
that the laser emits light for approx. 3 seconds

and the pickup lens moves up and down.

[Note] Be careful not to bring your eyes too

near to the laser and do not look straight
at it as this is dangerous.

to

on

Check

l

Check the

FE

bias.

I

Adjust the focus gain.

1

Adjust the TE balance.

l

Adjust the tracking gain.

I

f

Check that the eye pattern waveform can be

observed at the RF test point. (0.8-1.4Vp-p)

I

i

Replacement complete

[Note] Since the adjutments influence each other,

it

may be necessal}' to repeat them 2

times. times.

to

3

-8-

Adjustment Preparation

Apply markings to the positions

If

before adjustment.

specifidtions,

the following symptoms may occur.

the adjustment are out

of

the variable resistors

[Focus gain]

If

the focus adjustment is too low the pickup lens will not

be able to focus properly and the disk will not rotate.

is

adjustment
and noise will increase.

too high portions

of

a track may be skipped

[Tracking gain]

If

the tracking adjustment

susceptable to shocks

skipped

If

leading to unstable

The

mutually satisfy conflicting characteristics.

or

the disk time counter may stop.

the adjustment

focus and tracking adjustments are done so as to

is

too high the pickup lens may oscillate

or

is

too low the drive

or

bumps, portions

distorted sound.

is

of

a track may be

6-3. Test equipment and tools

necessary for adjustment

I. Oscilloscope

2.

DC voltmeter

3. Non-metallic adjustment screwdriver
Test

4.

CD (A-BEC TCD-792A)

of

If

the

the

more

6-4-1.

FE

(Focus Error) bias adjustment

and focus gain adjustment

I. Connect the oscilloscope to test point

shown

in

Fig. 6-2.

2.

Turn the power switch on and set the
the stop mode.

3.

Adjust
test point (FE IN)

4.

Play the first track
Rill

6-4-2.

Rll4

(FE

bios) so the DC voltage at the
is

OV.

of

the test CD and adjust

(Focus gain) so the DC voltage is - 7mV.

FE

balance and tracking gain

CD

adjustments

I.

Connect the oscilloscope to test point
shown

in

Fig. 6-3.

2.

Turn the power switch on and play the first track
of

the test CD.

3. After play has begun, connect the
GND.

4.

Adjust
of

5. Adjust
the wavefonn is 0.4V as

RI04

(FE

the waveform

Rll3

(tracking gain) so the amplitude

balance) so the

is

OV.

in

Fig. 6-4.

TEST

center

FE

IN

drive to

BP

IN as

pin to

voltage

as

of

6-4. CD Drive Unit Adjustment Proce-

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