Sega CD II Manual de usuario

111ma·

SERVICE

MANUAL

SEGA CD

/MEGA CD

NO.

002

ISSUED AUGUST, 1993

CONTENTS

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

IDENTIFYING PARTS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 3

DISASSEMBLY···········································

DRIVE ADJUSTMENT · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 6

INTERFACE···········································

DRIVE UNIT REPLACEMENT PROCEDURE· · · · · · · · · · · · · · 9

TOC READ-IN FLOWCHART· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 10

GUIDES FOR SERVICING· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

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

· · · · · · ·

10.

SCHEMATIC

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

11.

CIRCUIT BOARD

DIAGRAMS·····························

12. PARTS SPECIFICATIONS · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 18

13.

EXPLODED VIEW & PARTS

LIST·························

13-1. Exploded

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

13-2. Mechanical Parts List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 39

13-3. Electrical Parts List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

13-4. Accessories/Package List · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 42

Sega Enterprises, Ltd.

1. SPECIFICATIONS

Ratings

Model SEGA CD

Power

input

120V,

60Hz

Power consumption

18W

Temperature : 0

°C

MEGA

AC230

240V

SOHz

18W

Operating environment

Humidity

10%

80%RH

(no

condensation)

Dimensions

396

(W)

220

(D)

(H)

Specifications

CPU 68000 (

12.SMHz)

bit

(Program, Picture

data,

Sound

data

memory)

RAM 512k

bit

(PCM

waveform memory)

128k

bit

(CD-ROM

data

cache memory)

Memory

64k

bit

(Back-up memory)

bit

game

BIOS

Boot ROM

player software

CD+G

compatible

PCM sound source Stereo 8channels.

Sampling

frequency 32kHz

max.

Sound circuitry

bit

DIA converter.

DIA

converter

internal over-sampling digital filter.

PCM

and

sound

mixing

Mixing

with

mixing

terminal possible.

Frequency characteristics

20Hz

20kHz

Audio characteristics Signal v. noise ratio (S/N) Over

80dB

(1kHz) (Line

out)

Dynamic range Over90dB

Battery back-up secondary duration

Approx.

month

CD diameter

12cm

and

Bern

drive unit Rotational direction Counter-clockwise

(relative

the

side opposite

from

the

label)

Access time Average l.Ss

Audio output Line out

RCA

jack x 2 (L/R)

Audio input Mixing Stereo jack

mixing.

* Design

and

specifications are subject to change without

notice.

••

2. IDENTIFYING PARTS

2-1. Front & Top View of Console 2-2. Back View of Console

=0 c=:::i

D 0

r====>

Indicator LE

2-3. Accessories

SEGA-CD D

AC Adaptor

Stereo Mixing Cable

(Except Canada)

Steel Joining Plate

(Retainer Bracket)

D Door

Door Knob

MEGA-CD D

AC Adaptor

AC AdaptorJack

---Audio

Line Out Jacks tor

Stereo Sound Connection

to Other Components

Mixing Jack for Stereo Sound Connection

to the Original Mega Drive & Genesis

( ExceptU.K. , Kuwait ) (U.K. and Kuwait) (Australia and New Zealand)

Australia and New Zealand

Audio RCA Cable

(Except USA& Canada)

Screwfor Steel

Joining Plate

Extension Panel

(Assy Spacer)

(Conn Plate

Extension Plate

(Hold Plate Spacer)

(Conn Plate A)

Note: Names

pans in brackets ( ) arc

used

inthe pans list.

DISASSEMBLY

3-1.Chuck Disk Assembly Removal

(I ) Press the door knob to open the door.

(2) Release three (3) stoppers holding the chuck disk

assembly.

(3) When reinstalling, align the recesses

the chuck

holder with the stoppers.

3-2. Top Case Assembly Removal

(I)

Turn over the unit and remove six (6) screws from

the bottom.

(2) Do not remove the bottom case

this state.

Be sure

turn over the unit again and then

remove the top case

the original state.

/Bo:om

Case

3-3. Door Removal

(I)

Remove the top case assembly. (See item 3-2)

(2) Press the door knob to open the door.

(3) Remove the blind sheet on the right.

(4) Remove the door spring.

(5) Tum over the top case and remove two (2) screws.

then remove the oil damper.

(6) Push the door installation section

the directions

the arrows to release the bosses.

Blind Sheet

Door Knob

Door

Spring

j .

. '

3-4. Dismantling the Chuck Disk

Assembly

(

Remove

the

chuck

disk

sembly

(See

item

3-1)

(2) Remove

the

screw

and

release

two

(2) stoppers.

The connector·

plate,

magnet,

chuck holder

and

chuck

disk

come

apan

their

own.

~Screw

t:f

~Connector

Plate

@-Magnet

Ring

~/---1

r----

Chuck Holder

Chuck Disk

3-5. CD Drive Unit Removal

(

Remove

the

top case assembly. (See

item

3-2)

(2) Disconnect three (3) connectors

and

lift the

drive

unit.

CD Drive Unit

Connectors

3-6. Circuit Board Assembly

Removal

(l)

Remove

the

top

case assembly.

(See

item

3-2)

(2)

Remove

five

(5) screws

holding

the

shield

plate

(3) Disconnect three (3) connectors

from

the

drive

unit.

(4)

Remove

two

(2) screws

holding

the

circuit

board

assembly.

3-7. Door Lever and Door Knob

Removal

(1)

Remove

the

top

case assembly.

(See

item

3-2)

(2)

Turn

over

the

top

case

assembly

and

release

two

(2) stoppers,

then

remove

the

door lever

the

direction of

the

arrow.

(3) Release

two

(2) stoppers

and

remove

the

door

knob

Door

Knob

CD DRIVE ADJUSTMENT

4-1. Test Equipment and Test Disc

J) Frequency counter

2) Oscilloscope (20MHz

more)

3) Adjustment jig (MEGA-CD II (F) CD ADJ. JIG)

4) Audio generator

5) Voltmeter (two units with one needle

one unit with two needles)

6) Test CD (SONY TYPE-4)

4-2. Set-up for Adjustment

J) Connect both terminals

J40I.

2) Tum SW401 on and fix

using plastic tape, etc.

3) Connect the jig to CN403.

('4)

Supply power to the unit and jig. (Use AC adaptor

MEGA

II /SEGA CD II forjig)

Press the [RESET] switch

the jig so the counter reads

"O"

. .

6) Connect the Q301

emitter and CNIOl pin 28 B

connect Mega Drive II /Genesis II .

(

Sn,

,,vfJ

f51:_lw.;~

) 1..r/

'-t-

Test mode Adjustment item

0 vco

balance

3 Tracking gain

Note 1: The test mode

incremented each time the [TEST] switch

the jig is pressed.

Note 2: Test mode I

for checking the laser power and keeps the pickup laser illuminated.

4-3. Adjustment Parts Location

TP·PLCK 0

TP-80

TP·A

0 B SW401

0301

0 0

C410 0

TP-D

TP-VR 0

VR401

[!]

(EF balance)

TP-X

r;i

IC404 0 VR402

~mD

J401 0

GND

CN403

BTP-Y~

(Tracking gain)

VR403

[!]

(VCO)

TP°.vR

Adjustment

jig

TEST

MODE

TEST

RESET

ICI

ICJI

C .

4-4 Adjustment

. '2'S'v/·.:i111 I •

..,.i

\.:!.

Adjustment

Adjust-

I Test Test Adjustment procedure Purpose IFaults due

incom-

name

Jment

point

· equipment plete adjustment

VR403 TP-PLCK Frequency Shon both terminals of

C410

reproduce •

takes

time

(Connect counter

connectTP-D

and

GND.

a reference search for

the Adjust variable resistor clock signal Small each track.

1. vco probe's VR403 so the frequency of during

the signal attest

PLCK is I

adjustment ground

play.

•No

play

pos-

GND)

4.320 ±

O.OSMHz.

Large sible.

VR401

TP-X Oscilloscope, Press(TEST) switch twice

To adjust the • Playability

(CQllnect

Adjustment jig. set

"Test Mode 2". center of

the

diny discs

the Probe:

:1 tracking error

and

scratched

probe's 50mv/div v

rcy)

signal discs

be-

Small

ground to Ims/div

vv=i

_(B)

comes

poor.

TP-VR) Test

2.EF

Adjust VR40I so that peaks

balance (A) and (B)

the

output

adjustment waveform shown above are

•It

becomes

equal. impossible

search for

each

track.

Large

VR402 TP-X 2 voltmeters,

VTVMI

VTVM2

To adjust the •Becomes

TP-Y Generator,

EZI

tracking susceptible to

Adjustment jig servo gain. shocks.

Test

•It

becomes

)

VTP-VR

Small impossible to

lo3

I search for

vTP-X

each track

-diny

and

TP-Y scratched

Tracking

discs.

gain Connect as shown above.

adjustment Press (TEST) switch three • Playability

times to setto "Test Mode 3" diny discs

and supply a l

.OkHz,

and

scratched

O.lSVnns signal from the discs be-

generator. Large comes

poor.

Adjust VR402 so the 2

voltmeters

read

the same

value.

CD INTERFACE

5-1. CD Drive Block Diagram

500mv/div

5µs/div

(6)

500mv/div 50ms/div

.....

~),.

.,,,

• <

,...

500mv/div 500ms/div

2 4

~N~~

1111111

200mv/div 50ms/div 50mv/div 50ms/div

2µs/div

2v/d1v. 1µ

s/d1v

(8) 9

i:=t.

%1r---

..........

',,,.,

50mv/div 2s/div

ioomv/div

OOms/div

OOmv/div

50ms/div 200mv/div 500mv/div

i3)

200mv/div 2s/div 500mv/div 50ms/div

,---

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

J~Q2

o'\

CXAIOBI

"" IC403 IC40!

CXAI

082

CXOl

167

L'.==

_________________________

I .

5-2. Description of CD Interface

Signals

Name 1/0 : Function !

No_

/Pin

. I

No.

0 IError flag. Outputs

"H"

when I

C2PO !data correction is disabled. IC40l @

BCLK 0 IBit clock. IIC40l @

SDATA 0 ISerial data output. IIC401 @

LRCK 0 UR-channel identification clock. IC401 @

16MHz 0 i!6.9344MHz output. IC401 @

WFCK 0 IFrame clock. IC401

EXCK I Sub-code read clock. IC401 @

SBSO 0 ISub-code data. IC401 @

SCOR 0 ISub-code sync. IC401 @

L-

MUTE

0 IOutputs

"L"

when playing back IC404 @

(DM) music and

"H"

in other modes.

!RO

0 Interrupt request. IC404 @

COCK 0

mechanism control commu- IC404 @

nications clock.

HOCK I Host communications clock. IC404 @

DBO

1/0 Data bus 0. IC404 @

DB l 1/0 Data bus I. IC404 @

DB2

1/0 Data bus 2. IC404 @

DB3

1/0 Data bus

IC404 @

RESET I Resets the

hardware. IC404 @

5-3. CD Interface Connection

Reference Diagram

C2PO

LRCK

DATA 6CLK Serial data

PROCESS communications

DATA

IC401 16MHz

CXD1167 WFCK

EXCK Sub-code

S6SO

communications

SCOR

~1r

L-MUTE

(OM)

Audio control signal

MECHANISM IRQ

CONTROL UP

06US

(4bit)

063

IC404

062

UPD75006

061

Hostcommunications

060

CDKC

HOCK

RESET

DRIVE

UNIT

REPLACEMENT

PROCEDURE

Remove the GENESIS II/MEGA DRIVE

from

the SEGA CD II/MEGA CD

and unpl

power cord

the SEGA CD II/MEGA

from

the AC outlet.

Replace the CD drive

Connect the power adapter and

NESIS

II/MEGA DRIVE II.

Tum

on the door close detection switch (SW401)

forcibly to turn the power switch on. Check that

the laser emits a beam for about 2 seconds and the

pickup's object lens moves up and down.

Caution: Be careful; it is dangerous to look

straight at a laser beam.

Do not bring your eyes too close

it.

Adjust the

balance. (VR40I)

Adjust the tracking gain. (VR402)

Check that an

wavefonn

approx. l.5Vp-p

can be observed

IC402-2 (TP-RF).

Replacement complete.

f:..f)L-1:

TOC

(Total of Contents) READ-IN FLOWCHART

Focus operation timing

Focus drive signal at JC403

pin@

v~r

~i~,//

[5]

F~~iz~~~rI_Pc.:X~l

Vref

IC401

pin @ , ·'

[5]

Sense~~

=i_

[G]

Focused point

IC404 pin

@or

IC403 pin @

Focus~~

--------

-1

L______

______

[6]

Broken lines show that focus

not obtained.

[1] Power

[2] Pickup moves

inner edge.

[4]

LaserON

[5] Focus search

[6] Focus servo

[7]

Make a disc rotate.

[8] Tracking servo ON

[9] Disc servo

Reads

the TDC (disc data).

END

IC403pin@

Vrcf

SWS~I

ON [3]

IC403

pin@

sv-1v

--SW501

___

-L

[3]

IC402pin@

sv-1v

________

___!

Laser ON [4]

IC403 pin

Cl)

[5]

Vrcf--/

'---

--~~':~~P_!:~~-~~~~~-~P-~-~-~~~~2-

IC403

pin@

Vrcf

--uf~.,//L_

[6]

IC403

pin@

vrcr

Ji~8vl

__________

[7]

IC403

pin@

S..VoO'\.~

[BJ

IC403pin@

~50ms/~~!

500ms/div.

IC401

pin@

[10)

..-Starts reading data.

ovER~-'---

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