Sony WM-10 User manual

TROUBLESHOOTING

GUIDE

WM-10

STEREO

CASSETTE

PLAYER

Canadian

Mode!

WM-20

_I_

AEP,

Model

Sony

Corporation

TABLE

CONTENTS

Description

Page

General

precautions

for

repair....

operation

)

Noise

when

battery

is.

worn

out

(less

than

0.9V)

)

‘

power

LED

does

not

light

converter

operation

Converter

board

simple

check

method

Motor

does

not

stop

for

FF/REW

STOP...6

muting

sound

(FWD,

but

sound)

Low

level

Dolby

Hum

noise

during

playback

Noise

motor

rotation

Motor

coil

check

method

Fast

slow

speed

acceleration

Servo

board

(A)

(fl)

simple

check

method

Defective

tape

transport

I.,

.13,

Defective

tape

transport

....15,

Repair

know

how

.....

.4.

.7,

9—12

This

book

for

quick

and

easy

repairing.

File

with

the

sendee

manual.

WM-10/WM-20

(1)

General

Precautions

for

Repair

There

is.

safety

switch

built

into

the

headphone

jack,

but

docs

not

operate

unless

the

headphone

plug

plugged

in.

)

When

screwing

the

control

panel

and

audio

board

screws,

sure

insert

cassette

tape

first.

Reason

pressure

applied

the

tape

transport

ree]

chassis,

its

plane

affected.

When

performing

repair

which

involves

the

removal

the

function

plate

block

sleeve

ass’y,

sure

check

shut-off

for

FWD.

FF/REW

mode,

there

rolling

noise

for

about

seconds

tape

end,

then

the

motor

stops.

Check

referring

the

power

changes

below.

not

reuse

the

capstan

bush

after

having

removed

it.

removing

the

audio

board

from

the

set

and

touching.

33(13-1

(Power

OM)

the

motor

will

rotate

without

pushing

the

FWD

button

(belt

on).

There

will

clicking

noise,

but

this

not

defect,

and

will

stop

when

the

FWD

button

pushed.

Defective

soldering,

pattern

cuts,

parts

touching,

etc.

are

not

included

under

“Defective

Parts"

and

“Defective

Locations",

but

sure

check

these

also.

—

WM-10

WM-20

•

Operation

Noise

when

battery

worn

out

{less

than

0,9V)

•

Operation

Cause

Defective

Location

Battery

worn

out

Battery

terminal

plate

dirty.

Clean

terminal

plate

(Daifron

solvent)

Dirty

leaf

switch

contact

point.

S303-3

contact

point

cleaning

(Daifron

solvent)

flattery

short:

battery

terminal

and

audio

board

ground

touched.

Stick

insulation

audio

board.

Short

function

plate

ass’y

mounting

screw

tip

and

audio

hoard

pattern.

Stick

insulation

audio

board.

contact

laaf

audio

hoard

insulation

Noise

when

battery

worn

out

Operation:

When{§}becomes

1.0V,

040!

goes

off,

Q3G1

turns

on,

grounds

lC3Q3(3)and

reduces

buzz

noise.

—

WM-10/WM-20

Power

LED

does

not

light

converter

operation

Converter

Board

Simple

Check

Method

•

Power

the

battery

LED

lights

and

reel

table

rotates

when

the

headphone

plug

plugged

into

the

headphone

jack

and

PLAY

button

pressed,

OK.

headphone

jack

VOLUME

BATTERY

LED

PLAY

button

STOP

button

►►

button

operation

when

headphone

plug

plugged

into

head-

Defective

Part

phone

jack

and

FLAY

button

pressed.

J401

£303-3

LED

does

not

light

Voltage,

Waveform

Defective

Farts

Notes

reverse

voltage

D40I,

R401

R4Q3

Q40I,

Li,

La,

open

flexible

board

D3Q2

short

This

LED

(D40I)

uses

motor

reverse

voltage,

does-

not

light

the

motor

does

not

rotate.

Lights

2,5V

WM-10

WM-20

•

converter

operation

Operation:

1.5V

first

made

AC,

raised

3.0V,

then

3.0V

obtained.

Frequency

approx.

lOQkHz.

Converter

Board

Simple

Check

Method

When

the

converter

board

the

servo

board

(A),

check

for

between

and

When

the

converter

hoard

itself,

solder

1,5kO

resistor

shown

the

figure

below

and

check

for

between

and

[CONVERTER

BOARD]

0001

ZSBS24-BV3

[

CONVERTER

BOARD

Voltage

check

location

Transistor

Section

name

open

short

between

E—C

short

between

E-B

Q801

3,0

Q802

0,4

Q803

0,4

Q804

Q805

0.5V

4,2V

0617

3.0V

D801

pa*En

...

omz

2SCISS3

QBDS

25CI6Z3

HECT|P|£E

VOLTAGE

SE&

”

ov-

-tTiieo*

Q803

25D&*6-3-'

SWIM-HI

Hi.

oeo

RD4..3H-02

GB02

DftOI

imi

0ft“4

ftflfU

X-ISPlH

AJC04T

“

I_1

av-

r*H0?

470fc

LBV

'mJT

-C&0J

KLfflV

iFl

■

rfi

€

Resistor,

Transformer

Section

name

open

R801,

R803,

R804,

R63S,

R639,

TSOI

measured

when

each

removed.

WM-10/WM-20

Motor

does

not

stop

tor

FF/REW

STOP^

Cause

Defective

Parts

Effective

rotation

switch

(S901)

contact

point.

Auto

off

circuit

structural

parts

Flexible

board

pattern

open

S9G1,

R634

R63

C603

C605

Q615,

Q616,

Q617

flexible-

board

—

icaflj

ex-zoos?

WM-10WM-20

Muting

•

Sound

(FWD,

but

sound)

•

Low

level

Dolby

•

Hum

Noise

during

Playback

Noise

L-CH

Muting

Operation:

Mutes

dick

noise

immediately

after

power

(1C3Q3)

(Rj

During

FF/REWj

1C303

(T)

becomes

0.2V

and

muting

applied.

IC3Q3

Voltage,

Waveform

Defective

Parts

FV,

muted

vtr

Q3G2,

R3G7,

R3G8

C3G6,ICS03

Sound

(FWD,

but

sound!

Cause

Remedy

Head

lead

open,

defective

head

contact.

Check

head

lead,

head

position.

leaf

switch

$303-2

{FF/REW)

on,

muting

applied.

Move

audio

board

direction

the

arrow

change

FF/REW

switch

contact

point.

Defective

preamp

(IC301),

Dolby

(1C302).

power

(1C303),

circuit

structural

parts,

audio

volume

defective.

Check

IC301,

IC302,1C303,

Circuit

parts,

audio

volume

Defective

contact

point

because

ground

piate

solder

rear

audio

board.

Check

ground

plate

solder.

locations)

playback

Level.

*Sce

page

'‘Level".

—

W-20

WM-10WM-20

acra-i

Oiii’

Wistl

Conditions

DOLBY:

OFF

TYPE:

NORMAL

standard

tape:

P4-L&I

Headphone

connected

HEAD

PRE

AMP

DOLBY

OUT

1C301

L®

IC301

R®

IC301

L®

1C30X

Ft®

1C302

L®

IC3G2

R®

linVp'p

SOmVp-p

llQmVp-p

Adjust

that

OUT

60mVp-p.

POWER

AMPrC303

L®

INPUT

IC305

HEADPHONE

OUT

6QmVp-p

700mV[>-p

Low

Level

Cause

Defective

Locations

Dolby

(PB)

level

off

Adjust

variable

resistors

(RV1GI

„

201)

that

sound

volume

entrance

—27„7dBs

:t|dB

when

standard

tape

played

back.

27.7dBs

actual

value

0.028V

0.036V

Measure

VTVM

±ldB

P-P

79.2mVp-p

102mVp-p

Measure

oscilloscope

•

Dolby

Cause

Defective

Parts

Dolby

circuit

Dolby

adjustment

also

should

checked

ICS

R302

L-CH

Rill,

R106

Rl09

C104

"-CI09

R-CH

R211,

R2G6

R209,

C2G4

C2G9

•

Hum

Noise

during

Playback

Cause

Remedy

Generated

when

battery

voltage

down.

Replace

batteries.

Defective

soldering

flexible

board

Q302

(GND

pattern)

and

GRY

lead

(for

GND).

Repair

soldering

flexible

board

and

GRY

lead.

•

Noise

L-CH

Cause

Defective

Location

Rotation

switch

(S9G1)

noise

goes

onto

head

Change

head

lead

IC30P

lead.

positioning.

0\uvvt

Press

white,

red,

VmtT

■

L-J

yellow

leads

white

red,/

hIKC

the

direction

_.-y^L->

the

arrow,

yellow

push

bead

lead

—

WM-10/WM-20

WM-1

Motor

Rotation

Motor

Coil

Check

Method

Fast,

Stow

Speed

Acceleration

Servo

Board

(B|

Simple

Check

Method

Motor

Rotation

•

Starting

Circuit

Operation

Goes

motor

reverse

voltage

(lie

same

time

motor

rotation.

YES

Tape

inns

Staw

speed,

Rotates

inti

Feedba

Motet

can

appioxi

pins

„

Tape

runs

Tends

Slightly

fall

Laticxn

Motor

Coil

Check

Method

Hail

element

between

(JJ)

normai

value

between

©-(g)

240

£2

coil

check

between

normal

vlaue

between

(f)

(g)

approx.

1J2

—

WM-T

WM-20

uit

Operation

Drive

Circuit

Operation

C607

Q603

0*06

Q604

Rotation

reverse

time

charging

OFF

high

speed

relation

charging

completed

Servo

applied

Symptoms

Defective

Parts

Tape

Huns

aWay.

Q6Q3,

Q6041

open

short

Q6D5,

Q606J

between

E-U

short

open

C6G7

R6I0

R620

€607

€608

Stow

speed,

uneven

rotation

0*04

short

between

E-C

Rotates

intermittently

R6U

FLV60!

PGn

Feedback

Circuit

Operation

Motor

cannot

rotate

there

voltage

here.

Check

that

there

approximately

0.6

C6G1

not,

check

voltage

10501

pins

(fi)

Symptoms.

Defective

Parts

Tape

runs

away

R*05

open

01,

short

tween

€

Tends

run

slow

0606

open

0*02

short

between

E—B

Slightly

fast

D601

open

Rotation

uneven

R&2.8

open

For

rotation,

unsolder

phase

(or

phase)

make

open

and

rotate

the

motor

hand.

the

motor

rotates

high

speed

only

for

phase

only,

phase

drive

circuit

and

phase

defective.

Symptoms

Defective

Parts

Slow

speed

R*02,

R6G&,

R624

Q610,

Q61),

Q*|

Q609,Q613

open

short

between

E-C

Tape

runs

away

R&01,

R6M

open

•

Fast,

Slow

Speed

FWD

mode

Symptoms

Defective

Parts

Fast

speed

R6I3,

R614

(.TH601,

R640)

0pen

€612

short

Stow

speed

R618

open

0*07

short

between

E-C

R.V601

hits

control

panel.

Slow

speed,

uneven

rotation

R615

open

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