Sega MK - 80200-50, Saturn MK - 80200-50 Service Manual

llfliA"

SERVICE

MANUAL

SEGA SATURN (PAL)

NO.

013-

1

ISSUED

JUNE,

1995

CONTENTS

1.

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

2.

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

3.

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

4.

IDENTIFICATIONS AND LOCATIONS OF CIRCUIT BOARDS · · · · 5

5.

DISASSEMBLY

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

6

6.

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

7.

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

11

8.

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

13

9.

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

27

10. PARTS SPECIFICATIONS

..

···

.. · .. · ..

···

....

·····

..

····

.. · ..

32

11. EXPLODED VIEW & PARTS LIST ·

..

· ·

..

· ·

...... · .. · ...... · ..

70

11-1. Exploded

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

70

11-2. Mechanical Parts List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

71
11-3. Electrical Parts List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 72
11-4. Accessories/Package list · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 77

Sega Enterprises, Ltd.

PROTECTION OF EYES FROM LASER BEAM DURING SERVICING

This

set

employs

laser.

Therefore,

be

sure

to

follow

carefully

the

instructions

below

when

servicing.

Warning

When

servicing,

do

not

approach

the

laser

exit

with

the

eye

too

closely.

In

case

it

is

necessary

to

confirm laser

beam

emission.

Be

sure

to

observe

from

a distance of

more

than

30

em

from

the

surface of

the

objective

lens

on

the

optical

pick-up

block.

£ Cautio"' Invisible laser

radiation

when

open

and

interlocks

defeated

avoid exposure

to

beam

Caution

Use

of controls or adjustments or performance of procedures other

than

those specified

herein

may

result

in

hazardous

radiation

exposure.

This

console

is

classified

as a CLASS 1 LASER

product.

SAFETY PRECAUTIONS

Notice:

Comply

with

all

cautions

and

safety

related

notes

located

on

or inside

the

cabinet

and

on

the

chassis.

I.

When

replacing a chassis

in

the

console,

all

the

protective devices

must

be

put

back

in

place,

such

as

barriers, non-metallic

knobs,

adjustment

and

compartment covers/shields, isolation resistors/capacitors,

etc.

'

When

service

is

required, observe

the

original lead-dress. Extra precautions

should

be

taken

to

assure correct

lead

dress

in

the

high

voltage circuit.

3.

Always

use

the

manufacturer's replacement components. Especially critical components

as

indicated

on

the

circuit diagram

should

not

be

replaced

by

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

has

occurred, replace those components

that

indicate evidence of overheating.

PRODUCT SAFETY NOTICE

Many

electrical

and

mechanical

parts

have

special safety-related characteristics. These are

often

not

evident

from

visual

inspection

nor

can

the

protection afforded

by

them

necessarily

be

obtained

by

using

replacement components

rated

for higher

voltage, wattage,

etc.

Replacement parts

which

have

these special safety characteristics

are

identified

in

this Service

Manual.

Electrical components

having

such

features

are

identified

by

marking

with

a it,

in

the

parts

list

in

this Service

Manual.

The

use

of a substitute replacement component

which

does

not

have

the

same safety characteristics

as

the

SEGA

recommended

replacement

one,

shown

in

the

parts list

in

this

Se[Vice

Manual,

may

create shock,

fire,

or other hazards. Product Safety

is

continuously under

review

and

new

instructions

are

issued

from

time

to

time.

CAUTION ON FUSE

REPLACEMENT

Caution:

For continued protection against risk of

fire,

replace

only

with

same type, amperage, volt

fuse.

Attention:

Afin

d'assurer

une

protection permanente contre

tout

risque d'amon;age electrique, replacer uniquement

par

un

fusible

de

meme

type

et

de

amperes

volts.

8 This symbol indicates a

Fast

Operating Type Fuse .

.8.

This symbol indicates a Time

Lag

Type

Fuse.

-2-

Audio CD:

SATURN

COMPATABILITY

The normal audio Compact Disc

is

playable on the Saturn machine, and can

be

altered with all the effects

of

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

to

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

pictures. You need to buy

no

extra equipment to use CD+G on your Saturn.

CD+EG:

CD

and extended graphics is a new medium ready

to

be utilised by the music

community. It is basically an enhanced version of what

is

described above in

CD+G. You need no extra equipment to use CD+EG on your

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

to
be viewed, the MPEG program decodes the footage and plays it on screen. The
MPEG add-on is needed in order

to

use the MPEG video CDs and Philips CDi.

At the current rate

of

compression one movie can fit on two CDs.

',

I

Developed by Philips, CDi is an interactive CD format that can be used in a
variety

of

educational and entertainment purposes. Using video footage and CD

quality sound CDi has become an industry leader in the field

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

Saturn can access Kodak

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

Photo CD stores

open in the major cities.

Frame Buffering: A technique

to

maximise graphic display performance

by letting the graphics processor chip

"set aside" images

it

has

already calculated, allowing it

to

work on enerating the next fraction

of a seconds visual images, all while the screen is still busy painting

the last fraction

of

a second's display.

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

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

properly, parrallax scrolling can result.The

Sega Saturn has a whole

chip dedicated

to

controllingbackgrounds (the VDP2 or Video

Display Processor

2") that can generate 5 distict layers of

background at the same time.

Polygons/Second:

(1000's of) The number

of

polygons

of

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

or

lighting.

Realtime: An important adjective that usually indicates the game display

is being re-calculated every second, taking into account the

full

effects

of

the player's actions. When reffering

to

a game's response
or speed, it means the game responds instantly to the player's
commands.

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.

"Daytona USA" is a great

example

of

a texture mapped game.

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

of

view ("camera

angle")

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

the on-screen action. Typically requires strong scaling and rotational

capabilities. This can be seen on

Sega Sports games on Saturn.

1.

SPECIFICATIONS

Ratings

Model

MK - 80200-50

Power

supply

AC220-240 V 50/60

Hz

Power

consumption

Approx.

20W

Operating

environment

Temperature 5

°C

to

35

°C

HumiditylO%

to

80%

RH

(no

condensation)

Dimensions

260

mm(W) X 230

mm(L) X 83

mm(H)

(10.2 inches) x

(9.0

inches) x

(3.2

inches)

Specifications

Master

32bit

RISC

SH2

(28.4

MHz,

25MIPS)

CPU

Slave 32bit

RISC

SH2

(28.4

MHz,

25MIPS)

Sound

68ECOOO

(11.3

MHz)

Work

RAM

16

Mbit

Video

RAM

12

Mbit

Sound

RAM

4Mbit

Memories

CD

Buffer

RAM

4Mbit
IPLROM 4Mbit
Backup

RAM

256

Kbit

Resolution

320 x 224

dot

etc.

Graphics Colors

1024/2048

(16,770,000 simultaneous transmission)

Sprite Enlargement,

Reducation,

Rotation,

Transformation

5 screen

maximum

XY

Scroll 4

Rotation

2

Enlargement

I

reduction

2

Scroll

Windo~

2
Vertical

cell

scroll

Special features

Lateral

line

scroll

Enlargement

I

reduction

Polygons

Specialized

hardware

Wire

frame

CG

Functions

Special features Flat

shading

Gouraud

shading

32

channels

Sound

PCM & FM

sound

source

16

bit

sampling

Sampling

rate

44.1

kHz

max.

AudioDSP

CD-ROM

Intelligent double-speed

CD

drive

[Note]

Characteristics

and

specifications

may

be

changed

without

notice.

-3-

2.

IDENTIFYING PARTS

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

OPEN

Button Cartridge Slot

ACCESS

Light

CONTROL PORT 1 CONTROL PORT 2

2-2.

Back

View

of

Console

Master Reset Switch

DIRECTIONAL

Button START Button

2

RIGHT SHIFT Button

A Button
B Button
C Button

POWER Jack

AN

OUT Jack

-4-

3. ACCESSORIES

Positive Side

B

Lithium Battery (CR2032)

RGB

Cable

AC Cable

[UK]

AC Cable [SOE] AC Cable [AUSTRALIA]

4. IDENTIFICATIONS AND LOCATIONS OF CIRCUIT BOARDS

CD

Drive Unit

P.

SW Board

Main Board

R.

SW

Board

Fig.

4-1

-5-

5.

DISASSEMBLY PROCEDURE

5-1. Top Case Removal

1)

Remove

six

screws ®

and

then

the

top

case

in

the

direction of

the

arrow.

Fig.

5-1

5-2. CD

Compartment

lid

Removal

1)

Remove

two

screws ®

and

then

the

bracket

lid

CD

spring.

2)

Remove spring © .

3)

Remove

two

screws@

and

then

the

oil

dumper.

4)

Push

the lever

in

the

direction of arrow ®

to

release the

boss

and

then

push

the lever

in

the

direction of arrow ®

to

remove the

CD

compart-

ment

lid.

Fig. 5-2

5·3. CD Drive Unit Removal

1).

Disconnect

two

connectors

and

one

flat cable.

2)

Remove

the

CD

drive

unit

in

the direction of

arrow

©.

Fig. 5-3

5-4.

SH-1

Board

Removal

-6-

l)

Remove four screws ®

and

then

the

top

shield

plate.

2)

Remove screw

CD

and

release three tabs,

then

lift

the

SH-1

board

in

the

direction of arrow

Q)

to

remove

it.

Fig. 5-4

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

If@

and then the power

board.

2) Remove screw

® and then the power indicator

board.

3) Remove two screws

@ and then the

R.

SW

board.

R.SWBoard

Fig. 5-6

-7-

6.

CD DRIVE MAINTENANCE AND ADJUSTMENT

6-1. Maintenance

of

Pickup

I)

Checking the laser diode
As the laser diode wears out, the RF level
(amplitude

of

eye pattern) becomes lower.

Check that the RF level

is

0.8V - l.4Vp-p during

maintenance. If the RF level is less that

0.8Vp-p

then the pickup should be replaced.

2) Variable resistor on the

APC board
The variable resistor attached to the pickup on the
APC board is used to adjust the output power

of

the

laser. This adjustment

is

done at the facto!}' and

can not be performed

in

the field.

If

the laser's

output power

is

low, the laser diode has worn out
and should be replaced. Adjusting this variable
resistor may cause damage

to

the laser diode.

6-2. Laser Pickup Replacement

Procedure

-8-

Turn the power switch

off

and unplug the power

cord from the

AC outlet.

1

Replace the pickup.

1

Set the door close detection switch

to

on

manually and turn the power switch on.

Check
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.

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

to

3

times. times.

Adjustment Preparation

Apply markings to the positions

of

the variable resistors

before adjustment.

If

the adjustment are out

of

the

specifidtions,

the following symptoms may occur.

[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.

If

the

adjustment

is

too high portions

of

a track may be skipped

and noise will increase.

[Tracking gain]

If

the tracking adjustment

is

too low the drive

is

more

susceptable to shocks

or

bumps, portions

of

a track may be

skipped

or

the disk time counter may stop.

If

the adjustment

is

too high the pickup lens may oscillate

leading to unstable

or

distorted sound.

The

focus and tracking adjustments are done so as to

mutually satisfy conflicting characteristics.

6-3. Test equipment and tools

necessary for adjustment

I. Oscilloscope

2.

DC voltmeter

3. Non-metallic adjustment screwdriver

4.

Test

CD (A-BEC TCD-792A)

6-4. CD Drive Unit Adjustment Proce-

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I. Connect the oscilloscope to test point

FE

IN

as

shown

in

Fig. 6-2.

2.

Turn the power switch on and set the

CD

drive to

the stop mode.

3.

Adjust

Rll4

(FE

bios) so the DC voltage at the

test point (FE IN)

is

OV.

4.

Play the first track

of

the test CD and adjust

Rill

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

6-4-2.

FE

balance and tracking gain

adjustments

I.

Connect the oscilloscope to test point

BP

IN as

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

TEST

pin to

GND.

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RI04

(FE

balance) so the

center

voltage

of

the waveform

is

OV.

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Rll3

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of

the wavefonn is 0.4V as

in

Fig. 6-4.

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