Sony WM-20 Troubleshooting Guide

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.

Sony WM-20 Specifications

General

Type	Cassette Player
Brand	Sony
Model	WM-20
Signal-to-Noise Ratio	50 dB
Power Supply	2 x AA batteries
Output	Headphone output