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SERVICE

MANUAL

COMPACT

DISC

PLAYER

[|

|

=

(GENERAL)

(U.S.A)

(CANADA)

(AUSTRALIA)

(EUROPE)

(ITALY)

CONTENTS

SPECHAICATIONS

34.

Geerity

pies

Sia

aald

ace

aa

RS

one

BAG

tod

ai

AS

ae

Be

ane

it

Ciera

Re,

ees,

Sa

1

BEFORE

DISASSEMBLING

AND

REPAIRING

2.00...

eee

1

PRECAUTION

FOR

HANDLING

PICKUP

©...

ee

ee

ee

eee

es

2

DESCRIPTION

OF

LASER

BEAMCONTROL

CIRCUIT

J...

ee

ee

ee

3

DETAILS:

OF

PICKUP

oi55

facie

eee

pa

tea

wee

ae

ee

ae

he

ie

Se

eee

Faas

eae

ee

Ses

4

DISASSEMBLY:

5

oan

cw

Ste

GAA

eae

dee

PREMERA

SAS

ES

Ea

SG

go

ghee

GE

Dew

acest

5

ADJUSTMENT

odo

vetis-

eS

a8

a

oe

o-

aieheet

ens

Gow

Tikes

Ges

Pe

ne

bald

ceed

ad

Gaeta

sew

Biel

Benes

8

NORMAL

WAVE

FOAMOF

TEST

POINT

..

0.0...

00...

c

ee

eee

ee

eee

ee

eee

eet

eee

1

IC

BLOCK

DIAGRAM

............00

0000 wees

wae

ee

ME

os

eM

sna,

By

BUR gay

Way

ond

ENS,

ae

ae

eee

14

EXPLODED

VIEW

(

CABINET

)

i

ge

See

Ga ee

ee

a

Se

Pe

ee

ee

eS

ee

ae

eee

24

PARTS

IST

wut

coca

tnete

dees

is

Sek

Sees

REY

lh

ee

aed

okay

alos

nant

as

sik

Pe

ple

oP

ohn

tts

ae

Bedard

25

EXPLODED

VIEW

{

MECHANISM)

00.0.0...

0c

cece

scene

eens

eens

nese

tee

en

eee

eaen

enemies

30

PARTS

EIST

MECHANISM).

556,

20.0

be

ese

REGED

See

ee

ees

eed

Lem

eae

a

eee

oe

31

BEOCK

DIAGRAM:

0.0035.

oS

ashas

qatar

eld

bate

Da

AS

ela

Sodas

BE Vi

we

oT

bw

ae

al

atalen

a

ale

Sees

32

WIRING

CONNECTION

DIAGRAM

..

0...

6

ee

ee

eee

eee

ee

EE

34

SCHEMATIC

DIAGRAM

Occcc

bai

are

SS

Ee

ONG

Sele

ae

ee

a

ee

ey

ee

es

VE

a

Ra

36

WIRING.

DIAGRAM:(

MAING

6

ou

ok

oe

ee

ce

oe

eae

he

Pe

MR

Oe

EE

Be

SS

Ea

Ra

Bo

38

SCHEMATIC

AND

WIRING

DIAGRAM

(

AC

SOCKET,

DC

POWER

P.C.BOARD)

............0..000065

40

TROUBLESHOOTING

FLOW

CHART

4s

ctgig

weoe

dh

oe

ae

lee

Re

a

els

in

Ow

eS

A

es

a

Ba

42

WIRING

DIAGRAM

COTHERS.):

3a

eee

de

ore

eS

pe

one

eee

a

ERE

Ca

ka

ge

ewes

44

IC:

BEOCK

DIAGRAM

Wo

sa

hen

eGo

ea

oo

ees

CHER

Sa

Eos

UG

hg

se

Daa

ee

nei

eee

Re

45

WM-17964

en’

SPECIFICATIONS

Audio

General

Channels............

2channels

Power

supply.........

AC

110-127/200-220/230-250V

e

Frequency

response

....20

—

20,000

Hz

50/60Hz

...

GENERAL

Dynamic

range........

90

dB

AG

120V

60Hz

...

U.S.A,

Channel

separation

.....

80 dB

(

1

KHz)

CANADA

ohana

bene

e

sees

aoe.

:

a

)

AC

240V

50Hz

...

AUSTRALIA

ow

and

flutter

.......

ndetectable

AC

220V

50Hz

...

EUROPE

Outputs

..........6.

LINE

OUT:

1.6V/50K

ohms

‘

ITALY

E:

HEADPHONE:

30mW/32

ohms

DC

+7.2V~

B4V

Signal

format

Power

consumption

....10W

Sampling

frequency

....44.1

KHz

Dimentions

..........

approx.

127

x

41.5

x

187

mm

Quantization

.........

16

bits

linear/channel

(WxHxD)

(5x

1-5/8”

x

7-3/8")

Weight

{

approx.)......

900

g(

1

Ibs.

15

oz.

)

Pickup

System

............0.

Objective

drive

system

light

pickup

ee

,

Light

source

.........

Semiconductor

laser

Specifications

and

design

subject

to

change

without

notice.

=

Wave

length..........

790

nm

BEFORE

DISASSEMBLING

AND

REPAIRING

a

Many

ICs

and

a

pickup

are

used

in

this

compact

disc

player

and

these

components

are

very

sensitive

to

static

electricity

and

can

break

down

if

exposed

toa

high

static

voltage.

They

must

therefore

be

handled

very

carefully,

b

Since

pickup

consists

of

many

optical

components

and

other

precision

components,

do

not

repair

it

or

store

it

in

a

hot

or

humid

place,

near

strong

mangetic

fields,

or

in

a

dusty

location.

c¢

When

replacing

any

of

the

components

of

a

CD

player,

first

switch

OFF

the

player

and

disconnect

the

power

cord

from

the

player.

d

Ground

all

equipments,

measuring

instruments,

and

tools.

e

Place

an

electrically

conductive

sheet

on

the

work

bench

and

ground

it.

After

removing

a

pickup

from

its

conductive

pouch,

do

not

place

it

on

the

pouch.

Because

it

may

be

damaged

due

to

static

electricity.

f

Ground

a

soldering

iron

to

prevent

AC

leakage.

g

Ground

a

worker

with

metal

band

(

1M

ohms

)

to

ground

static

electricity

which

may

build

up

on

the

body,

h

Because

static

electricity

which

builds

up

on

clothing

does

not

ground

through

the

metal

band,

be

careful

not

to

touch

your

clothing

to

the

pickup.

i

Do

not

directly

look

at

the

laser

beam

emitted

from

the

pickup

or

aim

it

at

your

fingers

or

skin.

Armband

Resistor

(1M

ohm)

Senate

Sheet

Resistor

—*

(1M

ohm)

what,

PRECAUTION

FOR

HANDLING

PICKUP

—-_-_———————————

#

(1)

a

4

b

(2)

c

\

d

.

e

)

f

Precautions

for

transportion

and

storage

Store

the

pickup

in

its

conductive

pouch

until

just

before

using

it.

:

Do

not

apply

external

pressure

or

shock

to

the

Pick-

up,

ressure

x

Pressure

Dropping

store

in

conductive

pouch

Magnet

Precautions

for

handling

of

the

pickup

Since

the

pickup

has

a

powerful

magnet

in

itself,

do

not

leave

it

near

a

magnetic

field.

When

handling

the

Pickup,

hold

it

correctly,

and

do

not

apply

external

pressure

or

shock

to

it.

If

you

apply

extremely

strong

pressure

or

shock

to

it,

it

may

mulfunction

or

its

printed

circuit

board

may

crack,

The

pickup

is

a

single

component

and

has

been

accu-

rately

adjusted

as

such.

Do

not

touch

any

adjustment

point

and

mounting

screws.

If

the

laser

beam

strikes

your

eye,

it

may

be

damaged.

Do

not

under

any

circumstances

allow

the

laser

beam

to

strike

the

eye.

Also,

do

not

under

any

circum-

stances

apply

a

voltage

to

a

pickup

whose

laser

out-

put

section

(

objective

lens,

etc.

)

is

damaged.

Method

of

holding

pickup

Laser

Beam

Cleaning

lens

surface

If

dust

gets

onto

the

surface

of

the

lens,

blow

it

away

using

an

air

brush.

The

lens

is

retained

by

an

extreme-

ly

delicate

support

spring.

When

cleaning

the

lens

surface,

therefore,

use

a

soft

cotton

stick

moistened

with

iso-propy!

alcohol

and

clean

the

lens

very

gently,

taking

care

not

to

bend

the

support

spring.

(

other

liquid

may

injure

the

lens

)

Also,

do

not

use

an

ex-

cessive

amount

of

cleaning

fluid

otherwise

it

will

flow

into

the

pickup.

Do

not

disassemble

the

pickup.

Do

not

directly

look

at

the

laser

beam

or

aim

it

at

the

fingers

or

skin.

COTTON

SWAB

CONDUCTIVE

SHEET

DESCRIPTION

OF

LESER

BEAM

CONTROL

CIRCUIT

(1)

Laser

operation

circuit

(2)

Operation

of

the

circuit

a_

By

turning

“ON”

the

POWER

switch

(S601)

after

the

power

cord

is

plugged

in

or

the

battery

pack

is

con-

nected

to

the

unit,

then

closing

the

top

lid,

the

CLOSE

switch

(S609)

[

and

LASER

switch

($901)

hoa

a

eet

EUROPE/AUSTRALIA/ITALY

only

}

will

go

EUROPE

“ON”,

and

pin

35

of

1C501

(OPEN/CLOSE)

becomes

ae

aay

pecpOweR

“LOW”

level.

Fu

eae

only

b

Press

the

PLAY

key

(S604)

or

the

MEMORY

key

5901

|

|

CIRCUIT

ney

(S605).

While

the

key

is

pressed,

pin

15

(PLAY/

ana

diy

PAUSE)

or

pin

16

(MEMORY)

of

IC501

becomes

:

i

ON/OFF

“LOW”,

c

Pin

19

(HOLD)

of

1C501

becomes

“HIGH”,

and

the

hold

condition

of

1C501

will

be

cancelled.

d

Consequently,

pin

28

(P-CONTL)

of

1C501

becomes

"LOW",

and

“HIGH”

voltage

will

be

applied

to

the

POWER

ON/OFF

terminal

of

the

+5.2V

DC

POWER

BLOCK

via

0502.

e

-—5,2V

output

from

DC

POWER

BLOCK

is

applied

to

the

APC

circuit

of

the

pickup,

and

causing

the

pickup

emits

the

laser

beam.

Safety

Operation

1c801

@

a

When

the

top

lid

of

the

unit

is

open

with

the

POWER

SPEN

IETOEE

a

|e

switch

is

“ON”,

even

if

you

press

the

PLAY

key

or

MEMORY

key,

the

pickup

will

not

emit

laser

beam

because

the

CLOSE

switch

(S609)

[

and

LASER

1c501

(15),

(6)

i

f

ais

switch

(S901)

.....

EUROPE/AUSTRALIA/ITALY

PLAY

/

PA

PLAY

/

PAUSE.

only

]

is

“OFF”

and

pin

35

of

IC501

remains

“HIGH”.

MEMORY

ry

When

the

PLAY

or

MEMORY

key

is

pressed

without

i

loading

a

disc,

the

pickup

emits

laser

beam,

but

sever-

1c501

| |

al

ener

later

it

will

ep

to

emit

laser

beam

as

safety

HOLD

===>

circuit

defects

that

there

is

no

disc.

c

Even

in

the

event

that

1C501

breaks

down

and

the

10501

@8)

pickup

emits

laser

beam,

it

will

not

directly

enter

the

P-CONTL

eye

because

of

the

opaque

cover.

+5,2V

DC

POWER

ee

ae

POWER

ON/OFF

ov

-5.2V

ee

eee

52V

----

lou

DETAILS

OF

PICKUP

as)

(1)

Appearance

ACTUATOR

y

FPC

TERMINAL

LASER

DRIVE

CIRCUIT

OBJECTIVE

LENS

FPC

TERMINAL

PHOTO

SIGNAL

SENSOR

FPC

TERMINAL

(2)

Optical

system

)

COMPACT

DISC

FOCUS

+t>

TRACKING

LASER

DIODE

OIFFRACTION

GRATING

LASER

DRIVE

ACTUATOR

PHOTO

DIODE

CIRCUIT

FOCUS

OOIL

TRACKING

COIL

(3)

Wiring

diagram

GND

PHOTO

SIGNAL

DETECTO

OD®OO®O®O

GND

-Sv

FO

FO:

TO

TO

LASER

DRIVE

CIRCUIT

ACTUATOR

FO

GND

TO

-5V

be

5

FO

T

DISASSEMBLY

in

and

Sub

PCB

removals

*

|f

there

is

a

compact

disc

(CD)

in

the

player,

remove

(3)

Main

an

it.

*

Disconnect

the

power

plug

from

the

player.

*

Disassemble

the

player

in

the

following

sequence:

(1)

Bottom

lid

removal

ACTUATOR

TERMINAL

g

AR

S

‘

|

PHOTO

SIGNAL

SENSOR

FPC

TERMINAL

ah

LASER

DRIVE

sean

|

CIRCUIT

ue

‘

cB

(4)

Volume

PCB

removal

DISASSEMBLY

(5)

Other

PCB

removal

(6)

Top

lid

and

LCD

removals

8

5

T.

4

ey

PC

D

BRACKET

[-s

Ss

Qes~

RCA

SOCKET

OC

POWER

PC

Bf

y

Z

(7)

Circuit

bord

arrangement

figure

j

DC

POWER

PCB

LCD

VOLUME

PCB

MAIN

PCB

KEY

SWITCH

PCB

DISASSEMBLY

The

compact

disc

is

a

very

delicate

mechanism.

It

is

very

Important

that

the

spindle

motor

(which

rotates

the

disc),

the

sled

motor,

the

worm

gear,

etc.all

operte

smoothly

and

without

eccentricity.

Care

must

be

taken

not

to

exert

excessive

force

on

the

pickup

and

particular

care

must

be

taken

not

to

touch

either

the

jens

or

the

lens-control

circuitry.replacement

of

the

spindle

motor

(8)

Replacement

of

spindle

motor

a

Remove

the

two

screw

(Y13)

which

hold

escutcheon

mecha

cover

(see

exploded

view,

Ref

no

15,

16

of

page

30.)

b

Remove

the

two

screw

(

11

)

then,

after

removing

the

upper

pulley,

universal

pulley

and

spring.

c

Loosen

screw

(

12

)

which

hold

tarntable.

d

Remove

the

two

screw

(

13)

and

then

replace

the

spindle

motor.

e

After

fixed

the

spindle

motor,

set

the

turntable

upper

surface

so

that

ti

is

4mm

+

0.1mm

above

the

chassis.

f

With

the

smaller

diameter

end

of

the

spring

coil

upward,

install

the

universal

pulley

and

upper

pulley,

and

then

secure

by

using

the

two

screws

(

11

)

for

holding

the

supper

pulley.

g

Check

to

be

sure

that

the

universal

pulley

moves

smoothly

up

and

down.

TURN

TABLE

SPINDLE

MOTOR

(9)

Replacement

of

sled

motor

and

belt

a

Remove

the

screw

and

spring

plate

with

flat

gear.

b

Remove

the

screw

(

15)

which

hold

worm

gear.

c

Remove

the

two

screw

(

16

)

which

hold

sled

motor

bracket.

Remove

the

two

screw

(

17)

which

hold

sled

motor.

e

Replace

the

sled

motor

and

belt.

(10)

Replacement

of

pick-up

a

Remove

the

screw

and

springplate

with

flat

gear.

b

Remove

the

screw

(

14

)

and

spring

plate.

c

Replace

the

pick-up.

11

&

PULLEY

CD

rier

jen

COIL

ER)

TABLE

—”

&

AP

R

ZA

{>

FAAN2

SS

13

me

?

S

ZN

a

AZ

a

~

al

=e

J)

SPINDLE

MOTOR

@15

Lp

voces

a

oe

as

@14

Gy

sPRING

PLATE

A

ADJUSTMENTS

SSS

SSS

rs

sp

hs

SSS

Sh

D

Before

making

adjustments,

please

read

the

“before

disassembling

and

repairing”

“precaution

for

handling

pickup”

“description

of

leser

beam

control

circuit”and

»

“disassembly”

*

Service

Mode

This

mode

is

used

for

adjustment

when

servicing

and

its

functions

are

incorporated

in

the

microcomputer

(1C501).

Please

read

following

explanation

carefully

to

understand

the

function

of

this

mode,

(1)

The

program

of |C

501

operates

when

the

power

switch

is

“ON”

and

reset

signal

is

input

to

pin

18

of

IC

501,

(2)

First,

select

either

a

service

program

routine

or

a

normal

routine.

(3)

If

you

select

a

service

program

routine,

the

micro-

processor

brings

the

necessary

work

from

each

sub-

routine

in

accordance

with

the

key

inputs,

then

executes

the

work,

With

this

service

mode,

you

can

efficiently

check

or

Test

disc

necessary

for

adjustment

)

Measuring

equipment

necessary

for

adjustment

Equipment

Model

No.

(manufacturer)

Synchroscope

$S5711

(100

MHz

—

Doble

reflective

BAND-PASS

FILTER

Memory

scope

DSS

6521

(storage

scope)

kikusui

Denshi

AC

digital

voltmeter

|

Digital

tester

or

digital

multimeter

is

available

IN

OUT

DC

digital

voltmeter

|

Digital

tester

or

digital

multimeter

is

available

Audio

signal

generator

Band

pass

filter

Band

pass

filter

(see

attached

drawing)

GNO

GND

Notes;

a

Other

manufactures’

equipment

which

has

same

specificat-

ions

with

ones

designated

above

may

be

used.

b

Use

a

probe

when

observing

signal

using

an

oscilloscope,

memory

scope

or

digital

voltmeter.

ADJUSTMENTS

1.

Setting

the

service

mode

(1)

(2)

(3)

(4)

Disconnect

the

AC

power

plug

from

the

unit.

Press

the

PLAY/PAUSE

key

or

the

MEMORY

key

due

to

discharge

C904

connected

to

pin

18

of

1C

501

(RESET)

and

the

+V_

IN

smoothing

capacitor

(C951).

Consequently,

pin

18

of

IC

501

becomes

“LOW”.

Ground

the

pattern

of

TP36

(see

wiring

diagram

of

page

38

~

39)

using

jumper

wire.

Two

kind

of

IC

is

used

as

!C501

in

this

unit.

Follow

step

according

to

the

particular

part

No,

concerned.

TMP47C420AF8172Z

...Connect

the

AC

power

plug.

(This

mean

is

not

operation

of

the

power

switch

ON/OFF)

TMP47C420AF8173Z

°°

.Connect

the

AC

power

plug

while

pressing

the

PLAY

key.

The

player

will

be

in

the

service

mode

and

the

LCD

displays

«

Og

og

00”

2.

Particular

operation

in

service

mode

(1)

(2)

(3)

(4)

When

the

SKIP/SEARCH

key

is

pressed,

the

pickup

moves

to

the

outermost

or

innermost

portion

of

the

disc.

This

enables

to

check

the

operation

of

the

sled

motor.

When

the

MEMORY

key

is

pressed,

the

pickup

perform

a

focus

search.

If

a

disc

is

loaded

in

the

unit,

the

focus

servo

will

go

“ON”.

If

a

disc

is

not

loaded,

the

focus

search

will

take

place

indefinitely.

When

the

REPEAT

key

is

pressed

in

the

condition

of

step

2,

the

tracking

servo

will

go

“ON”,

and

the

unit

will

go

into

a

play

condition.

When

the

STOP

key

is

pressed

at

any

operating

mode,

you

can

cancel

the

ongoing

operation.

3.

Cancelling

service

mode

Disconnect

the

AC

power

plug.

and

then

remove

the

jumper

wire

from

the

pattern

of

TP36.

(See

the

wiring

diagram

of

page

38

~

39.)

Tracking

balance

adjustment

Test

disc

;

YEDS

18

(Sony)

Measuring

equipment

;

Oscilloscope

Connection

point

;

TP-3

Adjustment

point

‘

Adjustment

value

;

a

b

SVR

-

101

Waveform

symmetry

Put

the

unit

in

the

service

mode.

Load

the

test

disc

and

then

press

the

MEMORY

key.

The

disc

will

rotate

and

the

focus

servo

will

go

ON,

Note:

!f

the

pickup

is

at

the

innermost

track,

first

press

the

PP

key

to

move

the

pickup

slightly

to

the

outside

and

not

to

play

the

TOC

(zero

pattern)

on

the

disc.

Observe

the

tracking

error

signal

(

from

TP3

)

on

the

oscilloscope

and

adjust

SVR101

so

that

the

waveform

becomes

symmetrical

with

respect

to

0

V.

(See

Fig.

1.)

Focus

offset

adjustment

Test

disc

;

YEDS

18

(Sony)

Measuring

equipment

;

Oscilloscope

Connection

point

;

TP-2

(FE-Signal)

TP

-

1

(RF-Signal)

Adjustment

point

;

SVR102

SVR

102

Adjustment

value

:

o

when

unit

in

STOP

status

Connect

the

oscilloscope

to

TP2

(FE

signal).

Connect

the

oscilloscope

to

TP1

(RF

signal).

Follow

steps

(a)

and

(b)

of

the

“Tracking

balance

adjustment”

to

turn

the

focus

servo

“ON”,

Press

the

REPEAT

key,

The

tracking

servo

will

go

ON,

and

the

player

will

be

in

a

play

condition.

Measure

the

DC

offset

voltage

of

the

waveform

[focus

error

signal

from

TP2]

using

a

DC

voltmeter,

and

note

the

measured

value.

Press

the

STOP

key

and

remove

the

disc.

Adjust

SVR102

so

that

the

DC

offset

voltage

at

TP2

becomes

the

same

as

the

voltage

measured

in

step

(e).

Re-load

the

disc,

and

then

follow

the

steps

(c)

and

(d)

to

put

the

unit

in

a

play

condition.

(MEMORY

key

“ON”

>

REPEAT

key

“ON”.)

Confirm

that

the

‘a’

portion

of

the

waveform

(RF

signal)

from

TP1

must

be

a

straight

line,

and

the

‘b’

portion

(eye

pattern)

must

be

open.

(See

Fig.

2).

Also,

verify

that

the

height

of

the

wave

is

maximum,

OPENING

EXPANDED

Ao—

Fig.

2

a

(

Voltage

when

unit

in

PLAY

=

Voltage