Sony Cdp-c20 User manual

SERVICE

MANUAL

US

Model

CDP-C20/C26/C30

Canadian

Model!

CDP-C30

Photo

:

CDP-C30

SPECIFICATIONS

Compact

disc

player

System,

Compact

disc

digital

audio

system

Laser

Semiconductor

laser

(A

=

780

nm)

Emission

duration:

continuous

Laser

output

Max.

44.6

pW

*

This

output

is

the

value

measured

at

a

distance

of

about

200

mm

from

the

objective

lens

surface

on

the

Optical

Pick-up

Block.

Frequency

response

2

Hz

-

20

KHz

(+1

dB,

—2

dB)

Signal

to

noise

ratio

More

than

100

dB

Dynamic

range

More

than

88

dB

Harmonic

distortion

Less

than

0.05%

(1

KHz)

Channel

separation

More

than

95

dB

(1

KHz)

Wow

and

flutter

Below

measurable

limit

Outputs

LINE

OUT

(phono

jacks)

Output

level

2

V

(at

50

kilohms)

Load

impedance

over

10

kilohms

HEADPHONES

(stereo

phone

jack)

(CDP-C30,

C20

only)

Output

level

0

-

2.4

mW

(variable)

(at

32

ohms)

General

Power

requirements

120

V

AC,

60

Hz

Power

consumption

10

W

Dimensions

Approx.

430

x

110

x

400

mm

(w/h/d)

(17

x

43/e

x

15/4

inches)

not

including

projecting

parts

and

controls

Weight

Approx.

5.8

kg

(12

Ibs

13

02),

net

Remote

commander

(supplied

only

for

the

CDP-C30,

C26)

Remote

control

system

Infrared

control

Power

requirements

3

V

DC

with

two

size

AA

(R6)

batteries

Dimensions

Approx.

43

x

20

x

175

mm

(w/h/d)

(12/16

x

43/16

x

645/16

inches)

Weight

Approx.

110

g

(4

02)

including

batteries

Supplied

accessories

Audio

signal

connecting

cord

(phono

plug

x

2<—phono

plug

x

2)

(1)

CDP-C30,

C26

only:

Sony

SUM-3

(NS)

batteries

(2)

Design

and

specifications

subject

to

change

without

notice.

SAFETY-RELATED

COMPONENT

WARNING!!

COMPONENTS

IDENTIFIED

BY

MARK

/\

OR

DOTTED

LINE

WITH

MARK

/\

ON

THE

SCHEMATIC

DIAGRAMS

AND

IN

THE

PARTS

LIST

ARE

CRITICAL

TO

SAFE

OPERATION.

REPLACE

THESE

COMPONENTS

WITH

SONY

PARTS

WHOSE

PART

NUMBERS

APPEAR

AS

SHOWN

IN

THIS

MANUAL

OR

IN

SUPPLEMENTS

PUB-

LISHED

BY

SONY.

ATTENTION

AU

COMPOSANT

AYANT

RAPPORT

A

LA

SECURITE!

LES

COMPOSANTS

IDENTIFIES

PAR

UNE

MARQUE

/\

SUR

LES

DIAGRAMMES

SCHEMATIQUES

ET

LA

LISTE

DES

PIECES

SONT

CRITIQUES

POUR

LA

SECURITE

DE

FONCTIONNEMENT.

NE

REMPLACER

CES

COM-

POSANTS

QUE

PAR

DES

PIECES

SONY

DONT

LES

NUMEROS

SONT

DONNES

DANS

CE

MANUEL

OU

DANS

LES

SUPPLEMENTS

PUBLIES

PAR

SONY.

COMPACT

DISC

PLAYER

SONY.

-

CDP-C20/C26/C30

|

TABLE

OF

CONTENS

Section

Title

Page

SECTION

1

GENERAL

1-1.

Location

and

Function

of

Controls

........

3

SECTION

2

DISASSEMBLY

2.

LErOnt-Panes

CA):

+¢icte

Ces

Canes

tey

ahead

4

0)

(Bronte

Fate:

(by

tamer

sweets

vee

4

SECTION

3

ELECTRICAL

ADJUSTMENTS

......

5

SECTION

4

DIAGRAMS

4-1.

TC

Block:

Did

grains,

(1.054atnvatae

wee

Seats

fi

4-2.

Circuit

Boards

Location

..................

9

PEPE

PEL

POE

POO

OE

LOL

LALO

DLE

LPAI

ELLE

LE

LLL

EOE

OO

LHP

SAFETY

CHECK-OUT

After

correcting

the

original

service

problem,

perform

the

following

safety

check

before

releasing

the

set

to

the

customer:

‘Check

the

antenna

terminals,

metal

trim,

‘‘metallized”’

knobs,

screws,

and

all

other

exposed

metal

parts

for

AC

leakage.

Check

leakage

as

described

below.

LEAKAGE

TEST

The

AC

leakage

from

any

exposed

metal

part

to

earth

ground

and

from

all

exposed

metal

parts

to

any

exposed

metal

part

having

a

return

to

chassis,

must

not

exceed

0.5mA

(500

microampers).

Leakage

current

can

be

measured

by

any

one

of

three

methods.

1.

A

commercial

leakage

tester,

such

as

the

Simpson

229

or

RCA

WT-540A.

Follow

the

manufacturers’

instructions

to

use

these

instru-

ments.

A

battery-operated

AC

milliammeter.

The

Data

Precision

245

digital

multimeter

is

suitable

for

this

job.

Dee

eee

i

ee

ie

ee

ee ee

ee

ey

Section

Title

4-3.

Semiconductor

Lead

Layouts

..............

4-4,

Printed

Wiring

Boards

....................

4:5.

-Schemati¢-

Diagram:

a1

sin

ei

ver

kreasennes

SECTION

5

EXPLODED

VIEWS

Boh

Cabinet:

SeCtlOn

cn

tan

wee

Pe

Biletomncag

etna

5-2.

Disc

Table

Section

.............

0.

cence

53.

-PrAME

SECON.

Saisy

cease

vera

eees

was

5-4.

Optical

Pick-Up

Block

(BU-5C)

............

SECTION

6

ELECTRICAL

PARTS

LIST

aati

tt

eat

ntl

aaa

inl

etl

el

ie

ea

a

ok

oe

ae

oe

ee

3.

Measuring

the

voltage

drop

across

a

resistor

by

means

of

a

VOM

or

battery-operated

AC

volt-

meter.

The

“limit”

indication

is

0.75

V,

so

analog

meters

must

have

an

accurate

low-

voltage

scale.

The

Simpson

250

and

Sanwa

SH-63Trd

are

examples

of

a

passive

VOM

that

is

suitable.

Nearly

all

battery

operated

digital

multimeters

that

have

a

2V

AC

range

are

suitable.

(See

Fig.

A)

To

Exposed

Metal

Parts

on

Set

AC

vo/tmeter

(0.75

V)

Earth

Ground

Fig.

A.

Using

an

AC

voltmeter

to

check

AC

leakage.

tat

tala

ete

a

de

ee

et

oe

ee

Tee

ee

SERVICING

NOTE

NOTES

ON

HANDLING

THE

OPTICAL

PICK-

UP

BLOCK

OR

BASE

UNIT

The

laser

diode

in

the

optical

pick-up

block

may

suffer

electrostatic

breakdown

because

of

the

poten-

tial

difference

generated

by

the

charged

electrostatic

load,

etc.

on

clothing

and

the

human

body.

During

repair,

pay

attention

to

electrostatic

break-

down

and

also

use

the

procedure

in

the

printed

matter

which

is

included

in

the

repair

parts.

The

flexible

board

is

easily

damaged

and

should

be

handled

with

care.

CAUTION

Use

of

controls

or

adjustments

or

performance

of

procedures

other

than

those

specified

herein

may

result

in

hazardous

radiation

exposure.

NOTES

ON

LASER

DIODE

EMISSION

CHECK

The

laser

beam

on

this

model

is

concentrated

so

as

to

be

focused

on

the

disc

reflective

surface

by

the

objective

‘lens

in

the

optical

pick-up

block.

Therefore,

when

check-

ing

the

laser

diode

emission,

observe

from

more

than

30

cm

away

from

the

objective

lens.

—2—

CDP-C20/C26/C30

SECTION

1

GENERAL

1-1,

LOCATION

AND

FUNCTION

OF

CONTROLS

Front

Panel

.

Keg

BB

(AMS)*

buttons

§

|

DISC

SKIP

button

|

OPENICLOSE

button

j

:

, |

|

PROGRAM

button

Disc

compartment

|

HW

3

&

}

Janntecnens

}

'

POWER

switch

i

Display

window

|

a

a.

|

m@

(stop)

button

HEADPHONES

jack

and

PHONE

LEVEL

control

Remote

control

sensor

SHUFFLE

button

(CDP-C30,

C20

only)

TIME

re

>

if

(play/pause)

button

*

AMS

is

the

abbreviation

of

Automatic

Music

Sensor.

Remote

Commander

(CDP-C30,

C-26

only)

TIME

DUtt

On

menor

DISC

select

buttons

7

mowenmnernnrerenees

TY

SKIP

(disc

skip)

button

smmnrmmnenennere

REPEAT

button

SHUFFLE

button

-—---—----

SON

SE

pecans

PGM

(program)

button

&

(play)

button

—-~----—~

os

fpfomnnnennenenn

hee

PR

(AMS)

buttons

§§

(pause)

button

pee

<4

PP

(Manual

search)

buttons

@

(stop)

button

~~~

aa

Following

functions

are

operated

only

by

using

the

remote

commander.

Direct

disc

selection

CDP-C30

|

CDP-C26

|

CDP-C20

using

the

remote

commander

supplied

with

the

Sony

stereo

systems.

You

can

select

a

dics

directly

only

by

pressing

a

numeric

button

on

the

remote

commander.

Direct

disc

;

xX

selection

fer

fe

[oe

search

Repeat

play

O:

possible

X:

not

possible

Manual

search

You

can

locate

a

particular

point

in

a

selection

by

pressing

the

<q

or

Be

button

on

the

remote

commander.

Repeat

play

You

can

play

your

programmed

selections

or

all

the

discs

by

pressing

the

REPEAT

button

on

the

remote

commander.

Notes

on

the

remote

commander

and

remote

control

operation

©

To

avoid

a

malfunction,

do

not

simultaneously

depress

two

or

¢

Keep

the

commander

away

from

extremely

hot

or

humid

places.

more

buttons.

|

¢

Avoid

dropping

any

foreign

objects

into

the

commander

casing,

e

Avoid

exposure

of

the

remote

control

sensor

to

direct

sunlight

or

particularly

when

replacing

the

batteries.

lighting

apparatus.

Such

exposure

can

cause

a

malfunction.

CDP-C20/C26/C30

|

NOTE:

Follow

the

disassembly

procedure

in

the

numerical

order

given.

SECTION

2

DISASSEMBLY

2-1.

FRONT

PANEL

(A)

@

Remove

top

cover.

@

Press

POWER

switch

to

turn

the

power

on.

©

Press

OPEN/CLOSE

button

to

open

disc

table.

@

BVTT3x5

disc

table

@

BVTP3X

10

@

front

panel

2-2.

FRONT PANEL

(B)

@

Remove

top

cover.

j

i

@

Perform

steps

A-4

to

A-6.

disc

table

:

@

Turn

loading

pulley

until

disc

table

opens

slightly.

loading

pulley

C

f

|

CDP-C20/C26/C30

SECTION

3

ELECTRICAL

ADJUSTMENTS

Perform

adjustments

in

the

order

given.

1.

Connect

oscilloscope

to

test

point

TP

(RF)

and

test

point

Use

YEDS-18

(Part

No:

3-702-101-01)

disc

unless

other-

TP

(RFQ).

wise

indicated.

2.

Turn

POWER

switch

on.

3.

Use

the

oscilloscope

with

more

than

10

MQ

impedance.

3.

Put

disc

(YEDS-18)

in

and

press

>

PLAY

button.

4,

Adjust

RV2

for

an

optimum

waveform

eye

pattern

or

so

RF

PLL

Frequency

Adjustment/Lock

Frequency

Check

that

the

peak

is

maximum.

Optimum

eye

pattern

means

Procedure:

that

shape

“©”

can

be

clearly

distinguished

at

the

center

frequency

counter

of

the

waveform.

RF

signal

waveform

main

board

pe

)

VV

y

TP

(PCK)

oS

+

\YY)

TP

(ASY)

Que—————-9

—

YX

RXYAXAX)

\

FRR

Connect

test

point

TP

(ASY)

to

ground

with

lead

wire.

(Yj)

4

Turn

POWER

switch

on.

\i

AA

\

YN

Sy

|

Connect

the

frequency

counter

to

test

point

TP

(PCK).

Wd

Adjust

RV5

so

that

the

reading

on

frequency

counter

is

A=1.3+0.3

(Vp-p)

4

NI

WI

4,3218MHz+30kHz.

ae

(RF

PLL

frequency

adjustment)

5.

Remove

lead

wire

connecting

TP

(ASY)

to

ground.

REFERENCE

6

ea

ee

a

Put

disc

(YEDS-18)

in

and

press

>

PLAY

button.

Focus/Tracking

Gain

Adjustments

7.

Confirm

that

the

reading

on

frequency

counter

is

A

frequency

responce

analyzer

is

necessary

in

order

to

4,3218MHz.

perform

this

adjustment

exactly.

eee

(Lock

frequency

check)

However,

this

gain

has

a

margin,

so

even

if

it

is

slightly

off,

there

is

no

problem.

Therefore,

do

not

perform

this

adjust-

E-F

Balance

Adjustment

ment.

This

adjustment

should

be

made

when

replacing

TOP

(T-

Focus/tracking

gain

determines

the

pick-up

follow

up

(verti-

type

Optical

Pick-up).

cal

and

horizontal)

relative

to

mechanical

noise

and

shock

Procedure

:

ee

when

the

2-axis

device

operate.

However,

as

these

reciprocate,

the

adjustment

is

at

the

point

C)

where

both

are

satisfied.

main

board

@

When

gain

is

raised,

the

noise

when

the

2-axis

device

oper-

TP

(TEO)

O

oe

ates

increases.

|

@

When

gain

is

lowered,

mechanical

shock

and

skipping

TP

(ADJ)

O—---———-O

—

:

occurs

more

easily.

1.

Connect

test

point

TP

(ADJ)

and

test

point

TP

(TES)

to

e

When

gain

adjustment

is

off,

the

symptoms

below

appear.

ground

with

lead

wire.

2.

Connect

oscilloscope

to

test

point

TP

(TEO).

symptome

S|

Focus

|

Tracking

3.

Turn

POWER

switch

on.

4,

Put

disc

(YEDS-18)

in

and

press

>

PLAY

button.

eThe

time

until

music

5.

Adjust

RV1

so

that

the

traverse

waveform

is

symmetrical

starts

becomes

longer

for

above

and

below.

@

STOP

~-

PLAY

or

6.

After

adjustment,

remove

the

lead

wire

connected

in

step

automatic

selection.

(Hed,

low

or

high

5.

>Pi

buttons

pressed.)

A=B

(Normally

takes

about

1

A

(within

5%)

seconds.)

eMusic

does

not

start

and

B

VOLT/DIV:

1V

TIME

/DIV

:

Ims

disc

continues

to

rotate

for

HM

STOP

—-—

PLAY

or

automatic

selection.

Focus

Bias

Adjustment

(ida:

BDI

buttons

piesecd)

This

adjustment

should

be.

made

when

replacing

TOP

(T-

type

Optical

Pick-up).

Disc

table

opens

shortly

after

M

STOP

-—

P|}

low

or

high

Procedure

:

oscilloscope

PLAY.

aa

eSound

is

interrupted

dur-|

ing

PLAY

or

time

counter

inuiieheate

display

stops

progressing.

TP

(RF)

O

O+

®More

noise

during

2-axis

TP

(RFG)O

|

Oo

—

device

operation.

CDP-C20/C26/C30

The

following

is

a

simple

adjustment

method.

5.

Connect

oscilloscope

to

main

board

TP

(TEO).

~

Primary

Adjustment

—

6.

Adjust

RV4

so

that

the

waveform

is

as

shown

in

the

figure

Note:

Since

exact

adjustment

cannot

be

performed,

remem-

below.

(tracking

gain

adjustment)

ber

the

positions

of

the

controls

before

performing

the

adjustment.

If

the

position

after

the

primary

adjust-

ment

are

only

a

little

different,

return

the

controls

to

the

original

position.

VOLT/DIV:

1V

TIME

/DIV

;

2mS

oscilloscope

Procedure

:

(DC

range)

A

main

board

rN,

TP

(FEO)

Qxt————a-——-—----2

+

;

|

©

Incorrect

Examples

(fundamental

wave

appears)

TP

(TEO)

Omm-

-7

wmee

low

tracking

gain

1.

Keep

the

set

horizontal.

(

If

the

set

is

not

horizontal,

this

adjustment

|

VOLT/DIV:

1V

TIME

/DIV

:

2mS

cannot

be

performed

due

to

the

gravity

against

the

2

axis

device.

2.

Insert

disc

(YEDS-18:

Fifth

Selection)

and

press

>

PLAY

OV

button.

3.

Connect

oscilloscope

to

main

amp

board

TP

(FEO).

4,

Adjust

RV3

so

that

the

waveform

is

as

shown

in

the

figure

below.

(focus

gain

adjustment)

high

tracking

gain

higher

fundamental

wave

than

for

low

gain)

VOLT/DIV':

1V

TIME

/DIV

:

2mS

VOLT/DIV

:

100mV

TIME

/DIV

:

2mS

F

ala

MT

ANA!

AM

100mv

OV

e

Incorrent

Examples

(DC

level

changes

more

than

on

adjust-

ed

waveform)

low

focus

gain

VOLT/DIV

:

100mV

;

.

TIME

/DIV

:

2mS

Adjustment

Location

:

main

board

RF

PLL

FREQUENCY

ADJ/

LOCK

FREQUENCY

CHECK

E-F

BALANCE

ADJ

rr a!

————

SSeS

PCK,

ASY,

RV5

ADJ,

TEO,

RV1,

TES

250mV

OV

high

focus

gain

VOLT/DIV

:

100mV

TIME

/DIV

:

2mS

100mV

75mV

OV

TEO,

RV4

RV3,

FEO

RF,

RFG

RV2

TRACKING

GAIN

FOCUS

GAIN.

_—

FOCUS

BIAS

ADJ ADJ ADJ

|

—6§—

CDP-C20/C26/C30

SECTION

4

DIAGRAMS

4-1.

IC

BLOCK

DIAGRAMS

IC1

CXA1081S

IC201

CXD1161P

IC2

CXA1182S

CH

2

OUT

NC

Vref

Le

'

o

2

8

&

(%)

DIRC

(3)

C -

OUT

(Y)

AVEE

(=)

TST

OUT

@-@

TTL—

2b

LOOP

25)

3.5V_

REGULATOR

a

«

=

48)

(=)

GND

(@)

V

ref

LI

G)

GND

DA

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al

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DELAY

PHASE

CAPACITY

REVISION

CDP-C20/C26/C30

4-2.

CIRCUIT

BOARDS

LOCATION

PULSE

COUNT

BOARD

TABLE

MOTOR

Boe

IN

SW

BOARD

LOADING

SW

BOARD

PINJACK

BOARD

POWER

TRANSFORMER

P

BOARD

SENSOR

BOARD

(C)

-

DISC

LUMINUS

BOARD

LED

BOARD

POWER

SW

BOARD

LOADING

MOTOR

BOARD

HEADPHONE

BOARD

TRANSLATION

BOARD

POWER

BOARD

DOWN

SW

BOARD

MAIN

BOARD

SL/SP

MOTOR

BOARD

TACT

SW

BOARD

4-3.

SEMICONDUCTOR

LEAD

LAYOUTS

CXA1081S

CXD1161P-2

“PD75208CW-232

2SB731

RD6.8ES-B3

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M5204P

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side

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18

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18

13

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view)

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CXA1182S

BN1L4M

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CXK5816M-101

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US1060M

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cathode

(Top

view)

anode

CXA1291P

DTA144ES

DTC114ES

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ug

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MSM6408-32SS

hei

DAES

SRA-989A-1

1.GND

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6 8

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(Top

view)

5.

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1

3

CDP-C20/C26/C30

CDP-C20/C26/C30 CDP-C20/C26/C30

4-4.

PRINTED

WIRING

BOARDS

See

page

9

for

Circuit

Boards

Location

and

Semiconductor

Lead

Layouts.

2

Sele

6

Oe

PT

8

A

ea

14

15

7

fe

|

920

a1

22

|

[TACT

_SW_

BOARD]

[MAIN

BOARD}

{POWER

TRANSFORMER

P

BOARD]

e

Semiconductor

Location

[Ref.No.

|

Location

Ref.

No.

[Location

|

A

D1

D2

a

'

AC

IN

)

8

120V/60Hz

08

|_|

Q16

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1

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INDICATOR

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=

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|

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Note:

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parts

extracted

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the

component

side.

J

@

|

&

indicates

side

identified

with

part

number.

e

:

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wire

connected

to

the

ground

pattern

on

«

£98

$29

~

:

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component

side.

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SCHEMATIC

DIAGRAM

@

See

page

7

for

IC

block

d

2 3

4

LED

iagrams.

5

6

7

8

9

10

11

12

13

14 15

16

Al

18

19

20

21

22 23

24

25

26

27

28

29

30

31

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ae

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; ;

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Note:

Ail

capacitors

are

in

wF

unless

otherwise

noted.

pF:

wuF

50WV

or

less

are

not

indicated

except

for

electrolytics

and

tantalums.

All

resistors

are

in

&

and

1/,W

or

less

unless

otherwise

specified.

4:

internal

component.

Switch

&

OPEN/CLOSE

Position

$2

DISC

SKIP

OFF

$3

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OFF

$4

PROGRAM

OFF

$5

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OFF

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OFF

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OFF

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$9

TIME

OFF

$101

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OFF

$601

LIMIT

IN

OFF

SW103

CLOSE

ON

SW

104

UP/OPEN

DOWN

[___]

:

adjustment

for

repair.

Voltage

and

waveforms

are

dc

with

respect

to

ground

under

no-signal

conditions.

no

mark

:

PLAY

Voltages

are

taken

with

a

VOM

(50

kQ/V).

Voltage

variations

may

be

noted

due

to

narmal

produc-

tion

tolerances.

Waveforms

are

taken

with

a

oscilloscope.

Voltage

variations

may

be

noted

due

to

normal

produc-

tion

tolerances.

Circled

numbers

refer

to

waveforms.

Signal

path.

;

ep

:CD

(DISC

LUMINOUS

BOARD]

[

TRANSLATION)

The

components

identified

by

mark

or

dotted

line

with

mark

are

critical

for

safety.

eplace

only

with

part

number

specified.

Les

composants

identifiés

par

une

marque

sont

critiques

pour

la

sécurité.

Ne

jes

remplacer

que

par

une

piéce

portant

le

numéro

spécifé,

A

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[POWER]

ic.

|

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Sony CDP-C20 User manual

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