Philips CD304 MK II User manual

Compact

disc

player

CD304

Il/coryesr

Service

35493

A12,

For

servicing

hints

for

the

mechanism

see

Service

Manual

C.D.M.-1.

ervice

Manual

DIGITAL

AUDIO

CONTENTS

Elucidation

the

lay-out

and

table

contents

per

page.

Control

buttons

and

technical

specification.

Servicing

hints.

Measurements

and

adjustments.

Exploded

views

and

parts

lists

mechanical

parts.

Block

diagram,

circuit

diagrams,

data

PCBs,

parts

lists

electrical

parts

and

wiring

diagram.

Faultfinding

method.

Remote

control.

Onh

CLASS

Safety

regulations

require

that

the

set

restored

its

original

3127

condition

and

that

parts

which

are

identical

with

those

specified

used.

Documentation

Technique

Service

Dokumentation

Documentazione

Servizio

Huolte-Ohje

Manual

Servicio

Manual

Servicio

Subject

modification

Published

bysesrvice

4822

725

21058

Consumer

Elictronics

Printed

The

Netherlands

reserved

188

UGE

ELUCIDATION

THE

LAYOUT

THE

DOCU-

MENTATION

The

documentation

consists

chapters.

The

number

ofthe

chapter

indicated

the

first

digit

the

page

number.

The

second

digit

the

page

number

the

sequence

numbering.

modifications

supplements

require

new

supple-

mentary

replacement

pages,

the

page

number

extended

with

third

part:

digit

behind

the

page

number

indicates

that

concerns

supplementary

page.

replacement

page

indicated

letter

behind

the

page

number.

189

1-1

Example

3-6

page

chapter

3-6-1

supplementary

page

behind

page

3-6

3-6-a

the

replacement

page

3-6

(so

page

3-6

can

removed

from

the

documentation).

All

pages

are

provided

with

date

issue.

TABLE

CONTENTS

PER

PAGE

Chapter

Page

Contents

Chapter

1-1

Elucidation

the

lay-out

the

documentation

1-2

Table

contents

per

page

2-1

Control

buttons

2-2

Technical

specification

3-1

Servicing

hints

3-2

List

service

aids

Initiating

the

service

loops

Demounting

the

top

cover

Demounting

the

bottom

plate

Replacing

glass

fuse

1451

Replacing

the

transformer

fuse

Servicing

the

front

Demounting

the

control

and

display

PCB

Demounting

the

headphone

amplifier

PCB

3-3

Servicing

the

supply

PCB

Servicing

the

servo

and

decoder

PCB

Servicing

the

receiver

3-4

Servicing

the

tray

mechanism

4-1

Mechanical

measurements

and

adjustments

performed

the

CDM

Mechanical

adjustments

the

tray

mechanism

4-2

Specification

measurement

Changing

the

transformer

connections

Laser

power

supply

(POS.

VOLT.

SH.)

Checking

and

adjusting

Adjusting

the

focus

bandwidth

Check

the

AGC

and

offset

circuits

5-1

Parts

list

Exploded

view

tray

5-2

Exploded

view

cabinet

Parts

list

6-1

Block

diagram

6-2

Circuit

diagram

the

power

supply

6-3

Power

supply

PCBs

Parts

list

Mains

filter

circuit

6-4

Circuit

diagram

the

control

and

display

circuit

6-5

Control

and

display

PCBs

Parts

list

6-6

Circuit

diagram

servo

Circuit

(part

Page

6-7

6-9

6-10

6-14

6-12

6-13

6-16

6-17

6-18

PPT

ODM

ONNNNN

~o14

wood

p-o

Contents

Servo

PCB

Parts

list

Servo

PCB

Parts

list

Circuit

diagram

servo

Circuit

(part

Circuit

diagram

Decoding

circuit

(part

Decoding

PCB

Parts

list

Decoding

PCB

Parts

list

Circuit

diagram

Decoding

circuit

(part

Circuit

diagram

Tray

control

PCB

Parts

list

Circuit

diagram

headphone

amplifier

Headphone

amplifier

PCB

Parts

list

Circuit

diagram

the

receiver

PCB

drawing

the

receiver

Wiring

diagram

for

CD304/60R/65R

List

standard

symbols

List

chip

components

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Faultfinding

method

Exploded

view

the

remote

control

Parts

list

Circuit

diagram

the

remote

control

PCB

drawings

the

remote

control

199.GB

DIGITAL

AUDIO

CONTROLS

OMAN

Oak

—

«a

—_—

ON/OFF

OPEN/CLOSE

TIME

TRACK

SCAN

SELECT

down

SELECT

STORE

CANCEL

Headphone

socket

Headphone

level

potentiometer

SK1

SK15

SK12

SK5

SK13

SK6

SK14

SK7

SK11

BU1

3751

3456789

1415

REPEAT

PAUSE

REVERSE

FORWARD

START/REPLAY

STOP/Clear

Memory

DIGITAL

OUTPUT

FTD

DISPLAY

INPUT

REMOTE

CONTROL

SK4

SK10

SK18

SK9

SK19

SK8

SK17

SK16

BU3

1051

6851

2-1

191GB

-2

ECHNICAL

SPECIFICATION

System

Mains

voltages

Mains

frequencies

Power

consumption

Frequency

range

‘Output

voltage

‘Output

impedance

‘S/N

ratio

Compact

Disc

Digital

Audio

System

:110

127

220

240

10%

(to

changed

changing

the

transformer

connections)

Hz,

(no

conver-

sion

required)

25W

kHz

0.05

O-max.

Vrms

200

Headphone

output

voltage

—

output

impedance

Channel

separation

Channel

difference

Overall

harmonic

distortion

Intermodulation-

distortion

De-emphasis

Dimensions

(wxhxd)

Weight

The

above

specifications

apply

within

frequency

range

kHz

192

0-max.

5.6

Vrms

15002

0.6

0.003%

(switched

the

subcode

the

disc)

420x92x300

(tray

closed)

420x92x450

(tray

opened)

approx.

DIGITAL

AUDIO

SERVICING

HINTS

order

prevent

loose

metal

objects

from

getting

the

mechanism

will

necessary

see

clear

repair

station.

Before

the

player

being

used

serviced,

the

transportation

screws

should

removed.

These

screws

have

reapplied

after

servicing.

The

objective

can

cleaned

with

blow

brush.

For

servicing

hints

for

the

mechanism

refer

Service

Manual

CDM-0

and

CDN-1.

not

loosen

any

screws

other

than

those

mentioned

the

hints.

All

ICs

and

many

other

semi-conductors

are

susceptible

electrostatic

discharges

(ESD).

Careless

handling

during

repair

can

reduce

life

drastically.

When

repairing,

make

sure

that

you

are

connected

with

the

same

potential

the

mass

the

set

via

wrist

wrap

with

resistance.

Keep

components

and

tools

also

this

potential.

GENERAL

CHIP

COMPONENT

SOLDER

COPPER

TRACK

Sic

PCB

GLUE

SOLDERING

fe}

SOLDERING

IRON

SERVICE

PACKAGE

DISMOUNTING

VACUUM

PISTON

SOLDERING

4822

395

10082

IRON

™~

e.g

WELLER

SOLDER

TIP

PT-H7

SOLDERING

IRON

SOLDER

WICK

4822

321

40042

e.g.

PAIR

TWEEZERS

HEATING

SOLDERING

IRON

SOLDER

WICK

CHIP

COMPONENT

Fig.

PRECAUTIONS

3-1

The

disc

should

always

bed

down

well

the

turntable.

For

this

purpose

disc

hold-down

has

been

mounted

bracket

the

drawer

mechanism.

When

the

drawer

mechanism

has

demounted

for

repair,

loose

hold-down

should

employed.

The

set

can

then

function

normally.

Code

number

the

disc

hold-down

4822

532

60906.

SERVICE

AIDS

Service

supports

Audio

performance

test

disc

Disc

without

local

defects,

Disc

with

failures,

black

spots

and

finger-prints

4822

395

30202

4822

397

30085

4822

397

30096

Screwdriver

set

TORX

Set

straight

4822

395

50145

Set

square

4822

395

50132

Disc

hold

down

4822

532

60906

order

filter

4822

395

30204

receiver

4822

212

21449

MOUNTING

e.g.

PAIR

TWEEZERS

SOLDER

@0.5

0.8

SOLDERING

IRON

;

PRESSURE

SOLDER

@0.5

0.8mm

SOLDERING

TIME

sec/side

PRESSURE

SOLDERING

t +

IRON

HEATING

“

CLEANING

EXAMPLES

012C12

193

3-2

The

servo

can

beset

the

servicing

mode

check

the

switch

and

display

PCB

and

separately

test

the

servo

systems.

INITIATING

SERVICE

LOOP

-——

Put

disc

the

turntable.

—

Simultaneously

depress

the

CANCEL,

and

STOP

keys.

Keep

these

three

keys

depressed

while

switching

the

mains

voltage.

this

situation

the

laser

and

focus

contro!

are

operative

and

the

turntable

motor

running.

The

light

pen

remains

situated

under

the

lead-in

tracks.

The

radial

servo

system

switched

off.

this

service

loop

the

display

can

checked

follows:

—

The

display

will

indicate

01.02,

then

02.04,

03.06

and

continue

this

way

20.40.

20.40

followed

again

00.00, 01.02,

etc.

The

indicators

SCAN,

PAUSE,

REPEAT

and

DISC

ERROR

will

light

and

will

remain

switched

on.

indication

01.02,

bar

the

track

bar

also

driven

and

02.04

bar

etc.

—

now

the

CANCEL

key

depressed,

the

TRACK

indication

will

light

after

clock

strokes

the

display

and

the

DISC

ERROR

indication

will

off.

The

player

stays

service

loop

INITIATING

SERVICE

LOOP

The

player

can

brought

from

service

loop

into

service

loop

depressing

the

STORE

key.

Now

the

radial

servo

system

has

been

switched

independently

the

P-bit

and

the

sub-code.

The

display

makes

clear

that

the

set

service

loop

means

ABS,

REL

and

TOT.

The

player

can

brought

from

service

loop

the

PLAY

mode

depressing

the

START/REPLAY

key.

For

adjustments

that

have

performed

the

lower

side

for

which

the

unit

should

the

position

normal

end

use,

servicing

supports

are

supplied.

Code

number

4822

395

30202.

These

supports

can

mounted

the

four

holes

the

frame.

DEMOUNTING

THE

TOP

COVER

—

Remove

the

screws

the

sides.

—

Remove

the

cover

from

the

set

pulling

backwards.

Attention

When

mounting

the

top

cover;

care

should

taken

that

the

top

cover

placed

correctly

the

guidings

the

front

before

mounting

the

four

screws.

194¢6R

DEMOUNTING

THE

BOTTOM

PLATE

—

Remove

the

screws

the

bottom

plate.

—

Pick

the

bottom

plate

the

rear

the

set

and

pull

from

the

fixing

bosses

the

front

the

set.

REPLACING

GLASS

FUSE

1451

—

Remove

the

top

cover.

—

The

fuse

the

mains

filter

PCB

can

now

reached

the

left-hand

side

the

set

via

hole

the

mains

filter

housing.

REPLACING

THE

TRANSFORMER

FUSE

—

Remove

the

bottom

plate.

—

Remove

the

plastic

cap

covering

the

underside

the

transformer.

—

The

transformer

fuse

now

accessible.

—

Replace

the

screening

cap

once

the

fuse

has

been

replaced.

SERVICING

THE

FRONT

Demounting

the

front.

—

Remove

the

top

cover.

—

Remove

the

fixing

screws

the

upper

side

and

the3

screws

the

lower

side

the

front.

—

The

front

can

now

removed

from

the

set

pulling

forwards.

—

After

loosening

various

connections

and

connectors,

the

front

the

set

can

removed.

Demounting

the

control

and

display

PCB

—

Remove

the

screws

the

control

and

display

PCB.

—

The

PCB

can

now

taken

away

with

the

headphone

PCB

still

place.

Demounting

the

headphone

PCB

Once

the

control

and

display

PCB

has

been

taken

away,

the

headphone

PCB

can

removed.

SERVICING

THE

SUPPLY

PCB

—

Remove

the

screws

(see

Fig.

3a).

—

When

the

connectors

have

been

loosened,

the

supply

PCB

can

taken

out

the

set

from

the

rear.

Attention

The

Audio

cable

soldered

the

decoder

PCB.

When

mounting

the

supply

PCB

care

should

taken

that

the

PCB

falls

the

guiding

the

frame.

SERVICING

THE

SERVO

PCB

AND

THE

DECODER

PCB

(see

Fig.

3a)

—

Remove

the

top

cover.

—

Remove

the

screws

the

PCB

holder.

—

When

the

PCB

holder

placed

the

service

position

(see

Fig.

measurement

can

performed

both

the

servo

PCB

and

the

decoder

PCB.

SERVICING

THE

RECEIVER

For

practical

reasons,

best

service

the

receiver

means

the

trial

and

error

method,

with

which

defects,

any,

are

traced.

Code

number

receiver:

4822

212

21449.

After

removing

the

bottom

plate,

this

receiver

can

con-

nected

via

plug

91.

Demounting

the

receiver:

—

Remove

the

top

cover.

—

Remove

the

mechanism

—

When

clamping

spring

555

has

been

removed,

the

receiver

can

demounted.

Before

mounting

the

new

receiver,

sure

first

adapt

according

the

originally

mounted

version.

SERVO

PC.B

HEAOPHONE

PC.B.

CONTROL

AND.

DISPLAY

PC.By

CONTROL

+DISPLAY

PCB.

Fig.

SOTAT

600

Fig.

3a:

59987

Fig.

5195GB

3-4

SERVICING

THE

TRAY

MECHANISM

Demounting

the

tray

mechanism

—

Remove

the

top

cover.

—

Remove

the

front.

~—

Remove

the

screws

(see

Fig.

3a).

—

Loosenconnectors

and

the

tray

control

PCB.

—

The

tray

mechanism

can

now

taken

out

the

set.

—

For

repairs

the

tray

mechanism

can

made

operative

outside

the

set

fixing

again

connectors

and

the

drawer

control

PCB.

—

Involtageless

condition

the

drawer

can

opened

moving

the

drawer

forward

means

non-

scratching

sharp

device

(for

example

finger

nails)

that

placed

between

front

and

drawer.

Attention

If,

during

arepair,

the

tray

mechanism

the

tray

control

PCB

has

been

demounted,

the

set

will

not

function.

avoid

this

the

contacts

the

tray

in-end

switch

SK2

the

tray

control

PCB

should

interconnected.

Replacing

the

disc

hold-down

—

See:

Exploded

View

Tray.

—

Place

the

disc

hold-down

(item

107)

its

highest

position

(drawer

opened

far

possible).

—

The

disc

hold-down

can

loosened

bending

the

lugs

bracket

item

508

apart

and

taking

out

the

disc

hold-down.

196

Replacing

the

tray

motor

—

See:

Exploded

View

Tray.

—

Demount

the

tray

mechanism.

—

Remove

the

belt

(item

129)

from

the

motor

pulley.

—

Remove

the

screws

with

item

no.

119.

—

The

motor

can

now

loosened.

Demounting

the

drawer

(item

127)

and

lifting

piate (item

513)

assy

See:

Exploded

View

Tray.

—

Demount

the

tray

mechanism.

—

Remove

motor

bracket

item

509

undoing

the

screws

bracket

item

509.

—

Remove

roller

item

108

loosening

the

spring

ring.

—

Slide

the

tray

forward

and

remove

it.

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