Sony WM-10 User Manual

W-20 WM-10WM-20
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* Conditions
DOLBY: OFF
TYPE: NORMAL
standard tape: P4-L&I
Headphone connected
HEAD IN
PRE AMP
DOLBY OUT
1C301 L®
IC301 R®
IC301 L®
1C30X Ft®
1C302 L®
IC3G2 R®
j linVp'p
J SOmVp-p
1 llQmVp-p
Adjust so that VR OUT is 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) so that sound volume entrance is
—27„7dBs :t|dB when standard tape is played back.
27.7dBs actual value
0.028V - 0.036V
Measure by VTVM
±ldB P-P
79.2mVp-p ~ 102mVp-p
Measure by oscilloscope
• No Dolby
Cause Defective Parts
Dolby circuit
Dolby adjustment also should be checked
ICS 02
S3 02
R302
L-CH ,
Rill, R106 ~ Rl09 h C104 "-CI09
R-CH R211, R2G6 ~ R209, C2G4 ~ C2G9
• Hum Noise during Playback
Cause
Remedy
Generated when battery voltage is down.
Replace batteries.
Defective soldering on flexible board next to
Q302 (GND pattern) and GRY lead (for GND).
Repair soldering on flexible board and GRY lead.
• Noise on L-CH
Cause
Defective Location
Rotation switch (S9G1) noise goes onto head Change head lead IC30P
lead.
positioning. 0\uvvt
CD
Press white, red, 41 JX JL VmtT
5
■ L-J
yellow leads in white red,/ hIKC
o
the direction of _.-y^L->
the arrow, yellow
f j -
push bead lead
— 8 —

Sony WM-10 Specifications

General

Brand	Sony
Model	WM-10
Category	Cassette Player
Language	English