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Sony WM-10 User Manual

Sony WM-10
19 pages
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TROUBLESHOOTING
GUIDE
WM-10
m
m
u
m
STEREO
CASSETTE
PLAYER
US
,
Canadian
Mode!
WM-20
_I_
AEP,
UK
,
£
Model
Sony
Corporation
TABLE
OF
CONTENTS
Description
Page
General
precautions
for
repair....
.1
No
operation
)
^
Noise
when
battery
is.
worn
out
(less
than
0.9V)
)
.
No
power
LED
does
not
light
up
No
converter
operation
Converter
board
simple
check
method
Motor
does
not
stop
for
FF/REW
STOP...6
No
muting
No
sound
(FWD,
but
no
sound)
Low
level
No
Dolby
Hum
noise
during
playback
Noise
on
L
CH
No
motor
rotation
Motor
coil
check
method
Fast
1
slow
speed
No
speed
acceleration
Servo
board
(A)
(fl)
simple
check
method
Defective
tape
transport
I.,
.
.13,
14
Defective
tape
transport
If
....15,
16
Repair
know
how
.....
.1
7
.4.
5
.
.
.7,
$
.
9—12
This
book
is
for
quick
and
easy
repairing.
File
with
the
sendee
manual.
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Sony WM-10 Specifications

General IconGeneral
TypeCassette Player
BrandSony
ModelWM-10
Weight170 g (including battery)
Headphones3.5 mm jack

Summary

General Precautions and Basic Operation

General Precautions for Repair

Essential safety and procedural guidelines before commencing repair work.

Operation, Power, and Converter Issues

No Operation Troubleshooting

Lists causes and locations for complete lack of operation.

Noise when Battery is Worn Out

Explains noise issues occurring when battery voltage drops below 0.9V.

No Power and LED Not Lighting

Troubleshoots lack of power and the LED not illuminating.

No Converter Operation

Addresses issues where the voltage converter circuit fails to operate.

Converter Board Simple Check Method

Provides steps to check the converter board's 3V output voltage.

Motor and Speed Control Systems

Motor Does Not Stop for FF/REW STOP

Diagnoses motor not stopping after Fast Forward/Rewind operations.

No Motor Rotation

Guides through checking power supply, coils, and Hall elements for motor failure.

Motor Coil Check Method

Provides specific tests for motor coil continuity and Hall element function.

Fast, Slow Speed Issues

Addresses problems with incorrect tape playback speeds.

No Speed Acceleration

Troubleshooting for the lack of speed increase during certain operations.

Servo Board (A)/(B) Simple Check Method

Outlines checks for servo boards' motor control functions.

Servo Board Waveforms and Voltages

Illustrates waveforms and voltages for various points on the servo boards.

Servo Board Diagrams

Shows component placement and signal paths on Servo Board (A) and (B).

Audio Quality and Muting Problems

No Muting and Related Issues

Explains muting operation and checks for silence during playback.

No Sound (FWD) and Low Level

Covers no sound during forward playback and reduced sound volume output.

No Dolby and Hum Noise

Addresses Dolby system faults and audible humming noise during playback.

Noise on L-CH

Troubleshooting for unwanted noise specifically on the left channel.

Tape Transport Mechanism Faults

Defective Tape Transport (General)

Covers common mechanical failures, noise, and shut-off issues.

Tape Transport Operation Checks

Guides through checking motor rotation, button locks, and tape path.

Specific Tape Path Defects

Addresses button operation, tape winding, damage, and pinch roller issues.

Tape Winding and Damage

Explains tape winding issues and damage during ejection.

Comprehensive Repair Guide

Repair Know How Summary

A consolidated list of common faults, causes, and repair procedures.

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