Marantz 74cd50 User manual

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Compact

disc

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74CD50/o015/028/048/058

CONTENTS

Ist:

1

Explanation

of

the

layout

DIGITAL

AUDIO

2

Controls

and

technical

specification

3

Servicing

hints

4

Exploded

view

5

Measurements

and

adjustments

6

Circuit

diagrams,

power

supply,

voltage

adapter

7

Control

&

display

panel

8

Wiring

diagram,

Voltage

adapter

9

Electrical

parts

list

10

List

of

symbols

@

Safety

regulations

require

that

the

set

be

restored

to

its

original

Bei

jeder

Reparatur

sind

die

geltenden

Sicherheitsvorschriten

zu

condition

and

that

parts

which

are

identical

with

those

specified

be

beachten.

Der

Originalzustand

des

Gerats

darf

nicht

veraéndert

werden

used.

fir

Reparaturen

sind

Original-Ersatzteile

zu

verwenden.

@®

>)

Veiligheidsbepalingen

vereisen,

dat

het

apparaat

in

zijn

oorspronkelijke

Le

norme

di

sicurezza

esigono

che

l’'apparecchio

venga

rinesso

nelle

toestand

wordt

teruggebracht

en

dat

onderdelen,

identiek

aan

de

condizioni

originali

e

che

siano

utilizzati

pezzi

di

ricambiago

identici

a

gespecificeerde

worden

toegepast.

quelli

specificati.

©

Les

normes

de

sécurité

exigent

que

|’appareil

soit

remis

a

l'état

d'origine

et

que

soient

utilisées

les

pieces

de

rechange

identiques

a

celles

spécifiées.

CLASS

11

LASER

PRODUCT

3122

110

03420

Dokumentation

Documentazione

di

Servizio

Huolte-Ohje

Manua!

de

Servicio

Manta

|

de

Servicio

Documentation

lechniaue

Subject

to

modification

4822

725

22387

Fee

by

Service

Consumer

Electronics

Printed

in

The

Netheriands

©Copyright

reserved

CS

22

108

MARANTZ

DESIGN

AND

SERVICE

Using

superior

design

and

selected

high

grade

components,

MARANTZ

company

has

created

the

ultimate

in

stereo

sound.

Only

original

MARANTZ

parts

can

insure

that

your

MARANTZ

product

will

continue

to

perform

to

the

specifications

for

which

it

is

famous.

Parts

for

your

MARANTZ

equipment

are

generally

MARANTZ

INTERNATIONAL

Vestdijk

9

5600

MD_

Eindhoven

The

Netherlands

Phone:

+31/40.758290

Telefax:

+31/40.75.82.99

available

to

our

National

Marantz

Subsidiary

or

Agent.

ORDERING

PARTS:

Parts

can

be

ordered

either

by

mail

or

by

telex.

In

both

cases,

correct

part

number

has

to

be

specified.

The

following

information

must

be

supplied

to

eliminate

delays

in

processing

your

order:

1.

Complete

address

2.

Complete

part

numbers

and

quantities

required

.

Way

of

shipment

Oupw

.

Description

of

parts

.

Model

number

for

which

part

is

required

.

Signature:

any

order

form

or

telex

must

be

signed

otherwise

such

part

order

will

be

considered

as

null

and

void.

PARTS

ORDERING

Parts

may

be

ordered

at

the

following

addresses:

AUSTRIA

HORNYPHON

Vertriebsgeselischaft

GmbH

Wienerbergstrasse

1

A1101

Wien

Austria

Telex:

132.332

BELGIUM

SVD

DIVISION

MARANTZ

Industrialaan

1

1720

Groot-Bijgaarden

Belgium

Telex:

24466

CHILE

MARANTZ

DIVISION

OF

PHILIPS

S.A.

AV.

Santa

Maria,

0760

Casilla

2687

Santiago

Telex:

240.239

DENMARK

MARANTZ

DIVISION

OF

PHILIPS

SERVICE

A/S

Prags

Boulevard

80

Postbox

1919

DK-2300

Kabenhavn

S

Denmark

Telex:

31201

FINLAND

MARANTZ

DIVISION

OF

OY

PHILIPS

Ab

Kaivokatu

8

00100

Helsinki

Finland

Telex:

124811

FRANCE

MARANTZ

FRANCE

4

Rue

Bernard

Palissy

92600

Asniéres

France

Telex:

611651

GERMANY

MARANTZ

GERMANY

GmbH

Max-Planck-Strasse

22

6072

Dreieich

1

Germany

Telex:

529821

THE

NETHERLANDS

Elpro

Marantz

Wint

Hontlaan

28

3526

KV

Utrecht

The

Netherlands

Telex:

4748

NORWAY

MARANTZ

DIVISION

OF

PHILIPS

A/S

Sandstuveien

40

0680 Oslo

6

Norway

Telex:

72640

GREAT

BRITAIN

MARANTZ

AUDIO

U.K.

Ltd

Unit

15/16

Saxon

Way

Industrial

Estate

Moor

Lane

Harmondsworth

UB7

OLW

Great

Britain

Telex:

935196

GREECE

SHERTON

ELECTRONICS

S.A.

P.O.Box

21025

Hippocratus

Street

188

Athens

11471

Greece

Telex:

216.795

JAPAN

MARANTZ

JAPAN,

Inc.

35-1,

7-chome,

Sagamiono

Sagamihara-shi,

Kanagawa

Japan

KUWAIT

AL

ALAMIAH

ELECTRONICS

Ussama

Building

Fahd

al

Saleem

Street

P.O.Box

23781

Safat-Kuwait

Telex:

22694

ITALY

MARANTZ

ITALIANA

S.P.A.

Via

Chiese,

74

20126

Milano

Italy

SAUDI

ARABIA

AL

ALAMIAH

ELECTRONICS

P.O.Box

5954

University

Street

Riyadh

11432

Saudi

Arabia

Telex:

401530

SOUTH

AFRICA

MARANTZ

DIVISION

OF

PHILIPS

S.A.

Main

Road

Martindale

P.O.

Box.

58088

Newville

21114

South

Africa

SPAIN

PHONO

S.A.

Ignacio

iglesias

10

Badalona

(Barcelona)

Spain

Telex:

59355

SWEDEN

MARANTZ

DIVISION

OF

PHILIPS

Forsdljning

AB

Tegeluddsvagen

1

S-115

84

Stockholm

Sweden

Telex:

14060

Telex:

35000

PHTC

NL

routing

IND

NLMTFAT

SWITZERLAND

DYNAVOX

ELECTRONICS

Route

de

Villars

105

1701

Fribourg

Switzerland

Telex:

942377

TURKEY

DOGRUOL

Ltd.

1.M.C.

6

Blok

N°6310

Unkapani

Istanbul

Turkey

Telex:

22085

MALTA

CACHIA

&

GALEA

Republic

Street,

68D

Valetta

Telex:

1682

PORTUGAL

MARANTZ

Divisao

philips

S.A.

service

Outurela-carnaxide

2795

LinDA-A-VELHA

Telex:

43906

All

of

the

above

locations

are

fully

equipped

to

take

care

of

your

total

service

needs.

Because

various

countries

have

differing

configuration

requirements,

it

is

necessary

that

you

contact

the

service

facility

in

your

particular

country.

In

the

event

that

there

is

no

service

location

listed

for

your

country,

please,

contact

the

nearest

facility

for

the

necessary

In

case

of

difficulties,

do

not

hesitate

to

contact

the

Technical

Department

at

abovementioned

address.

assistance.

|

1.

EXPLANATION

OF

THE

LAYOUT

OF

THE

DOCUMENTATION

The

documentation

consists

of

chapters.

The

number

of

the

chapter

is

indicated

by

the

first

digit

of

the

page

number.

The

second

digit

of

the

page

number

is

the

sequence

numbering.

If

modifications

or

supplements

require

new

supplementary

or

replacement

pages,

the

page

number

is

extended

with

a

third

part:

A

digit

behind

the

page

number

indicates

that

it

concerns

a

supplementary

page.

A

replacement

page

is

indicated

by

a

letter

behind

the

page

number.

Example

3-6

is

page

6

of

chapter

3

3-6-1

is

a

supplementary

page

behind

page

3-6

3-6-a

is

the

replacement

page

of

page

3-6

(so

page

3-6

can

be

removed

from

the

documentation).

GENERAL

DISMOUNTING

VACUUM

PISTON

SOLDERING

_

\.,\4822

395

10082

{RON

SOLDER

WICK

4822

321

40042

e.g.

A

PAIR

OF

TWEEZERS

S

B

‘Ss

ty)

HEATING

Vs

HEATING

x

SOLDERING

IRON

CHIP

COMPONENT

SOLDER

SOLDER

COPPER

TRACK

P.C.B.

SOLDER

WICK

CLEANING

PRECAUTIONS

SOLDERING

IRON

SOLOERING

IRON

CHIP

COMPONENT

SERVICE

PACKAGE

1-1

MOUNTING

e.g.

A

PAIR

OF

TWEEZERS

¥

‘sy

SOLDER

SOLDERING

PRESSURE

Va

¥

SOLDERING

TIME

SOLDER

<3

sec/side

@0.5-

0.8mm

PRESSURE

/

SOLOERING

¥

(

IRON

EXAMPLES

27

012C12

CS

22

109

2-1

CONTROLS

NN

OHINOD

3LONTE

CO

&

Co

REMOTE

FRONT

OF

PLAYER

1

Disc

tray

on

which

the

OPEN

key

is

situated;

the

tray

closes

when

the

front

is

pressed

briefly.

2

REMOTE

SENSOR

Receives

the

signals

from

the

remote

control

handset.

3

DISPLAY

-

Informs

you

about

the

functioning

of

the

player.

—

Displays

details

from

the

disc

contents

list.

4

PLAY-REPLAY

(>)

—

Starting

play

(PLAY)

—

Returning

to

the

beginning

of

a

track

(REPLAY)

5

PAUSE

(Il)

Interrupting

play.

6

ON/OFF

Switching

on

and

off.

7

RECALL

Reviewing

a

programme.

8

PROGRAM

MODE

-

Selecting

PROGRAM

mode

when

storing

a

program.

-

Selecting

EDIT

mode

to

enter

the

recording

time

when

making

a

tape

recording.

9

’1-0’

digit

keys

-

Selecting

another

track

number

during

play.

~

Selecting

a

track

number

to

start

play

with.

-

Selecting

track

numbers

when

programming.

-

Entering

the

recording

time

when

making

a

tape

recording.

10

MEMO

-

Storing

track

numbers

in

a

program.

~

Storing

the

recording

time

when

making

a

tape

recording.

11

CANCEL

~

Erasing

track

numbers

you

do

not

wish

to

include

in

a

program.

-

Erasing

track

numbers

from

a

program.

-

Erasing

favourite

track

selections.

CS

22

110

ANALOG

MDA.02152

917/T19

12

<«

Fast

search

for

a

particular

passage;

backwards

to

the

beginning

of

the

disc.

13

Kd

DD}

—

Selecting

another

track

number

during

play.

—

Selecting

a

track

number

to

start

play

with.

—

Selecting

track

numbers

when

programming.

(I4

from

high

to

low;

PR

from

low

to

high).

14

PHONES

BU-5

Connecting

headphones.

15

STOP/CM

—

Stopping

play

(STOP).

-

Erasing

a

program

(CM

=

Clear

Memory).

16

RPT

Repeating

a

track,

the

entire

disc

or

a

program

(RPT

=

repeat).

17

RANDOM

Playing

in

a

random

order.

18

»>

:

Fast

search

for

a

particular

passage;

forwards

to

the

end

of

the

disc.

REMOTE

CONTROL

FUNCTIONS

Most

of

the

controls

also

appear

on

the

remote

control

handset.

The

functions

below

con

only

be

operated

using

the

remote

control

handset:

19

FTS

Activating

the

Favourite

Track

Selection

circuit.

20

AMS

Automatically

playing

the

beginning

of

each

track

(AMS

=

Automatic

Music

Scan).

21

A-B

Storing

the

start

and

stop

points

of

a

passage

to

be

repeated.

22

w

VOLUME

A

Adjusting

the

sound

level

when

the

player

is

connected

via

the

VARIABLE-output

to

an

amplifier

or

HiFi

system

without

its

own

remote

control

(w

from

high

to

low;

&

from

low

to

high).

3

<—

INDEX

—~

~

Selecting

another

index

number

during

play.

—

Selecting

an

index

number

to

start

play

with.

(

<—

from

high

to

low;

—~

from

low

to

high).

24

TIME

Selecting

the

time

information

you

want

to

see:

—

REMAIN:

The

remaining

playing

time

of

a

track.

—

TOTAL

REMAIN:

The

remaining

playing

time

of

the

entire

disc

or

a

program.

~

The

elapsed

playing

time

of

a

track.

For

the

best

reception

of

the

signals

from

the

remote

control

you

should

aim

it

as

directly

as

possible

at

the

REMOTE

SENSOR.

CONNECTIONS

REAR

OF

PLAYER

~

All

connections

to

the

rear

panel

should

be

made

with

the

power

to

the

entire

system

switched

off.

-

To

avoid

cross-connection

of

channels,

connect

one

plug

at

a

time.

25

ANALOG

OUTPUTS

VARIABLE

(BU-3):

For

connection

to

an

amplifier

of

HiFi

system

without

its

own

remote

control.

FIXED

(BU-2

Line

out

L/R):

For

connection

to

a

MARANTZ

amplifier

of

HiFi

system

with

its

own

remote

control.

@

Insert

a

red

plug

into

the

’R’

socket

(right-hand

channel)

and

the

other

plug

into

the

’L’

socket

(left-hand

channel)

of

the

VARIABLE

output

or

the

FIXED

output.

In

the

case

of

connection

via

the

VARIABLE

output,

the

sound

level

can

be

adjusted

with

the

w

VOLUME

a

keys

on

the

remote

control.

@

Insert

the

two

other

plugs

into

the

corresponding

sockets

of

the

CD

or

AUX

input

of

your

amplifier.

You

can

also

use

the

TUNER

or

TAPE

IN

connection,

but

never

the

PHONO

input.

This

is

not

suitable

for

Compact

Disc

reproduction.

26

DIGITAL

OUTPUT

OPTICAL

BU-2-Digital

out

This

output

supplies

a

digital

signal

via

an

optical

path;

for

this

reason

it

can

only

be

connected

to

a

Digital

Analog

Converter,

an

amplifier

with

an

optical

digital

input

or

a

digital

sound

processor.

For

this

use

an

optical

lead.

To

prevent

dirt

entering

this

output,

it

is

covered

with

a

little

cap

which

should

only

be

removed

when

the

output

is

in

use.

27

REMOTE

CONTROL

IN/OUT

BU-2

RCS

IN/OUT

-

For

connecting

up

the

equipment

when

you

are

incorporating

the

player

in

a

MARANTZ

HiFi

system

with

its

own

remote

control

system.

For

this

use

the

RC5

cable

supplied.

-

For

connecting

the

remote

contro!

receiver

RC

55,

available

as

an

accessory,

if

the

siting

of

the

changer

prevents

its

REMOTE

SENSOR

from

receiving

the

signals

from

the

remote

control

directly.

28

DIGITAL

OUTPUT

COAX

BU-4

For

digital

signal

processign

or

future

applications

such

as

CD-I.

This

output

supplies

a

digital

signal

and

can

therefore

only

be

connected

to

an

input

which

is

suitable

for

this

signal.

Use

here

a

lead

with

one

cinch

plug

on

either

end.

WARNINGI

.

Never

connect

this

socket

to

a

non-digital

input

of

an

amplifier,

suvn

as

AUX,

CD,

TAPE,

PHONO,

etc.

This

can

damage

the

amplifier

and

the

loudspeakers.

2-2

44

229

Ai1

REMOVING

THE

TRANSIT

CLAMPS

The

two

red

transit

clamps

on

the

underside

of

the

player

lock

the

player

mechanism

to

secure

it

during

transportation.

Remove

these

transit

clamps

before

using

the

player

Store

them

in

the

recesses

provided

Refit

them

before

transporting

the

player

TECHNICAL

SPECIFICATION

@

System

@

Disc

diameter

@

Mainsvoltages/02/05

/04

/06

/01

e@

Mains

frequencies

Power

consumption

Frequency

range

Output

voltage

fixed

Output

impedance

S/N

ratio

Channel

separation

Channel

difference

Total

harmonic

distortion

@

Intermodulation

distortion

@

De-emphasis

@

Dimensions

WxDxH

@

Weight

:

Compact

Disc

Digital

Audio

system

:

120mm/80mm

:

110

V,

127

V,

220

V,

240

V

+

10%

(to

bechanged

by

transformer

connections)

>

100

V +

10%

:117V

+

10%

>110

V,

127

V,

220

V

+

10%

(to

be

changed

by

carousel

switch)

:

50,60

Hz(no

adaption

required)

:

<25

W

:

20

Hz

+

20

kHz

+0,1

dB

:

max.

2

V

,,/=

10

kOhms

:

200

Ohms

:

=96

dB

:

293

dB

:

<0,2

dB

:

<-88

dB

:

<-88

dB

:

0

or

15/50

psisswitched

by

the

subcode

on

the

disc)

:

420

x

117

=

1&8

mm

(tray

closed)

:

approx

5

kg

CS

22

111

3-1

3.

SERVICING

HINTS

ESD

A

Ates

All

ICs

and

many

other

semi-conductors

are

susceptible

to

electrostatic

discharges

(ESD).

Careless

handling

during

repair

can

drastically

reduce

life

expectancy.

When

repairing,

make

sure

that

you

are

connected

via

a

wrist

wrap

with

resistance

to

the

same

potential

as

the

chassis

of

the

set.

Keep

components

and

aids

also

at

the

same

potential.

When

the

tray

mechanism

and

CDM-unit

has

been

disassembled

the

player

can

be

prepared

for

measurements

by

bridging

the

"tray

detection”

switch

SK2

on

the

main

panel.

Service

disc

hold-down

The

disc

should

always

rest

properly

on

the

turntable.

To

achieve

this

a

disc

hold—down

has

been

mounted

in

a

bracket

of

the

tray

mechanism.

If

the

tray

mechanism

has

to

be

disassembled

for

servicing,

a

separate

disc

hold-down

should

be

used.

For

a

service

disc

hold—down

see

the

figure

below.

Compose

a

service

Disc

hold-down

in

the

following

way.

-

Cut

in

the

most

inner

ring

of

a

disc

holddown

(4822

462

50383)

with

small

and

sharp

nippers

See

fig.

below.

-

Enlarge

the

diameter

of

the

innermost

ring

slightly

with

the

hind

part

of

a

pencil

or

ballpoint,

so

that

it

jams

onto

the

turntable

with

sufficient

force.

-

If

the

jamming

force

decreases

after

certain

time

of

use,

the

diameter

has

to

be

enlarged

with

a

pencil

or

ballpoint

again.

Explanation

of

the

symbols

used

=

oscilloscope

(ri

=

10

MQ)

cD

=

meter

(voltmeter

with

ri

=

10

MQ)

°

°

=

carry

out

alignment/adjustment

ON

test

point

42

565

A12

CS

22

112

SERVICE

TOOLS

Audio

test

disc

1

Disc

without

errors

+

disc

with

DO

errors,

black

spots

and

fingerprints

Disc

(65

min,

1kHz)

without

pause

Maximum

diameter

disc

Torx

screwdrivers

Set

(straight)

4822

395

50145

Set

(Square)

4822

395

50132

13th

order

filter

4822

395

30204

4822

397

30185

4822

397

30096

4822

397

30155

4822

397

60141

WORKING

WITH

THE

FAULTFINDING

TREE

Follow

the

path

of

the

faultfinding

tree,

beginning

at

the

top

left.

Perform

the

actions

you

come

across

in

the

various

blocks.

Look

at

the

various

side

branches

to

find

out

if

the

information

you

see

there

applies

to

your

problem.

If,

for

instance,

you

find

the

indication

display

_,

this

means

that

no

picture

appears

on

the

display.

If

you

establish

this

fault,

follow

the

branch

and

perform

the

recommended

actions.

Check

the

components

mentioned.

In

a

number

of

branches

further

reference

is

made

to

measurements

you

could

carry

out.

These

measurements

are

explained

in

several

tables

further

on

in

this

manual.

EXTENSION

CABLE

CONTACT

SIDE

REMOVE

as

BLUE

STRIP

SOLDERING

IRON

a

SOLDER

wa

see?

0.5-0.8mm

ee

MAIN

PRINTED

CIRCUIT

BOARD

~~

ee

CABINET

DISASSEMBLY

HINTS

CONTROL+DISPLAY

PANEL.

©

©

3MX16

3MX16

EVA.00846

916/T19

CS

22

113

FOIL

CONNECTION

POSITION.

SERVICE

POSITION

PLAY

EVA.00849

916/T19

CS

22

114

PLAY-SERVICE

POSITION

EVA.00848

916/T19

MEASURING

AND

ADJUSTMENT

POSITION

OF

THE

SET

MDA.02138

916/T19

MECHANICAL

PARTS

201

201

202

202

203

204

204

206

207

207

208

208

209

210

210

211

212

213

214

214

215

216

217

218

219

219

221

222

223

224

224

226

227

228

229

231

232

233

234

235

236

237

237

238

239

241

242

243

244

246

247

248

249

251

252

253

254

256

257

258

261

4822

444

40308

4822

444

40316

4822

459

10747

4822

459

10887

4822

450

61359

4822

460

20768

4822

460

20771

4822

460

20762

4822

464

50764

4822

464

50773

4822

402

61254

4822

402

61266

4822

460

20763

4822

321

10492

4822

321

10445

4822

460

20766

4822

321

10457

4822

321

10522

4822

218

10272

4822

218

10283

4822

321

22603

4822

402

61255

4822

460

20767

4822

402

50277

4822

460

20769

4822

460

20772

4822

444

50603

4822

466

92251

4822

410

50169

4822

410

60115

4822

410

60202

4822

410

60118

4822

450

61362

4822

410

60116

4822

505

10571

4822

492

52094

4822

402

61252

4822

532

51756

4822

325

50176

4822

325

50177

4822

528

90638

4822

276

30403

4822

276

30404

4822

444

60568

4822

466

92257

4822

528

90639

4822

402

61207

4822

520

40177

4822

530

80503

4822

402

61253

4822

402

61196

4822

358

10115

4822

492

51902

4822

528

81329

4822

466

61587

4822

402

50276

4822

492

51935

4822

492

32883

4822

691

30209

4822

361

20998

4822

535

92907

only

for

/04

only

for

/01/02/05/06

WORDMARK

MARANTZ

only

for

/01/02/04/05

WORDMARK

PHILIPS

only

for

/06

only

for

/04

only

for

/01/02/05/06

only

for

/04

only

for

/01/02/05/06

only

for

/04

only

for

/01/02/05/06

only

for

/04

only

for

/06

only

for

/01/02

only

for

/05

only

for

/01/02/04/05

only

for

/06

only

for

/04

only

for

/01/02/05/06

only

for

/04

only

for

/01/02/05/06

only

for

/04

only

for

/01/02/05/06

4-4

CONTROL+DISPLAY

TION

INVISIBLE

LASER

RADIATION

WHEN

OPEN.OO

NOT

STARE

INTO

BEAM

3104

106

75942

4Nx10

<i

~~

HEADPHONE

5

PANEL

eg

256

“

|

Ke

239

||

7

dete

241

-<@

;

'

242

3mx10

VARIABLE

LINE

OUT

562

Vi

REMOTE

CONTROL

Fe

TRANSMITTER

Ze

=<

—

EVA.00828

T27/912

CS

22

115

5-1

Follow

the

path

of

the

faultfinding

tree

beginning

at

the

top

left.

Perform

the

actions

you

come

across

in

the

If

you

establish

this

fault,

follow

the

branch

and

perform

TROUBLE

SHOOTING

(FAULT

FINDING

TREE)

various

blocks.

In

a

number

of

branches

further

reference

is

made

to

Look

at

the

various

side

branches

to

find

out

if

the

measurements

you

could

carry

out.

information

you

see

there

applies

to

your

problem.

If,

for

These

measurements

are

explained

in

several

tables

further

on

in

this

manual.

instance,

you

find

the

indication

~“tsplay.__

this

means

that

no

picture

appears

on

the

display.

START-UP

PROCEDURE

Dornay

CUCK

&

TRAY

Jed

ERR

oo”

SHOCK

~

REMOTE

~

INTERMITTENT

Ay

Bhaod

Oe

~s

POPS

INDICATION

SENSITIVE

CONTROL

FAILURE

|

POWER

POWER

POWER POWER

Mt

yes

OFF OFF OFF

OFF

x

‘0

RCS

RECEIVER

Skt

6542

TRAY

MECHANISM

6527

FUSE

DISPLAY

6543

BELT

6526

TRANSFORMER

FUSE

DRIVER

6544

TRAY

MOTOR

8)

\)

8530

(©)

MAINS

TRANSFORMER

pP

SIGNALS

545

TRAY

SWITCH

Sk2

TRANSPORT

SCREWS

REMOVED?

VOLTAGE

ADAPTER

VFTD

6551

Eee

EYE

PATTERN

(HFI)

ae

Hae

KILL

TL

es

653

oRCUT

ANGLE

DISC-LIGHTPATH

+58

6555

aby

45

6556

Disc

6

6557

68

6558

~10

6559

6568

SERVICE

POSTION

0

STOP/CM

}<<SEARCH>>

SEARCH>>

<<SEARCH

3

ARM

FRICTION

PHOTO

DOSES

OK.

FLEXFOR.

Fe

FLEX

FOIL

:

SyaD

6500

80...83

|

Lo

6504

RADIAL

MOTOR

im

3865

FLEXFOL

FOCUSMOTOR

LENS

CLEAN?

SEE:

‘ADJUSTMENT

OF

FOCUS

OFFSET

ADJUSTMENT

SERVICE

POSIT!

SERVICE

POSITION

0

STOP/CM

+

PLAY

+

POWER

ON

PREVENT

*

.

SKATING

ae

SPEED

OF

THE

RADIAL

ARM

SPEED

AFTER:

¥

‘MIQUTE

ZERO

HIGH

TRACK

e

TAAgK

2

t

!

FOLLOWING

FQu

GL

TURNTABLE

MOTOR

MC

ea00)

ve

HF!

6504

iG

X-TAL

(1502)

Fone

6505

6512 6549

OFF

et

REDIG

an

RELAG

pl

RAD+

$

(0)

BO

+83

cosci

cosc2

LOAD

D-9

TEST

DISC

5A

s

0

,

wee

me

Re

“4

DE-

‘SIS

DISTORTION

LEVEL

mack

3

|

ier

(Je

(Je

DE-EMPASIS

An

oni

i)

|

2)

|

|

|

|

|

OOS

WSAB

6535 6536

OEEM

6540

ATS8

HEADPHONE

DOBM

QRA

CLAB

WSBO

WSBD

6572

6541

6540

PANEL

act

DAAB

6541 6541

6582

6535

QDA

DABD

6583

8536

SWAB

MUTE

6554

EYE

PATTERN

(HF)

SCAB

MUSB

SDAB

6541

KILL

SEE:

SPECIFICATION

8542

MEASUREMENT

6544

6545

SERVICE

POSITION

0

PLAY

—1

STOP/CM

+

+

REPEAT

PLAY

SERVICE

POSITION

3

+

POWER

ON

ERROR

INDICATION

ERXX

4

TABI

SEE:

ERROR

LE

MDA.02127

1-27

918

CS

22

116

the

recommended

actions.

Check

the

signals

mentioned.

A-1

uP

-

SIGNALS

Pulse

“high”

ee

2,5

Vde

“low”

when

tray

is

opening

2,5

Vdc

*high”

when

tray

is

closing

pulses

low

in

position

pause

high”

only

when

a

8

cm

disc

has

been

used.

T-22387A

a

DISC,

SEARCH

Play

67

17

8

cm

disc

|

Service

position

0

or

1;

search

>

2

Po

oe

Srmpamiveteeie

|

al

Smite

a

pear

an

wae

eal

(Geeemaba

mene.

[ar

|

nae

seommnbeleeas

Cer.

lee,

ot

[awe

poutndertewe«

|e

|

[wef

T-22387B

B-3.

CHECK

OF

THE

PHOTODIODES

Remarks

See

drawing

|

Signal

depends

on

Distance

lens

«>

38314A12

IR

LED

of

remote

control

MOA.01378

1-08

824

T-22387C

B-4

CHECK

OF

LASER

SUPPLY

The

laser,

the

lasersupply

plus

the

monitor

diode

form

a

feedback

system.

A

defect

in

the

lasersupply

may

result

in

the

destruction

of

the

laser.

If,

in

that

case,

the

laser

is

replaced,

(=

complete

C.D.M.-unit)

the

new

laser

will

also

become

defective.

However,

it

is

impossible

to

check

and

repair

a

feedback

system

if

a

link

is

missing.

For

this

reason

the

laser

supply

can

be

checked

with

the

replacement

circuit

for

laser

assembly.

°

Remarks

PRS05539

PRS05540

T-22387D