1-30 (No.MA192)
5.5
Signal processing section
No sound from either
channel.
Is 9V present at IC165
/IC265 pin 16?
Compare the L-ch and
R-ch to locate the
defective point.
Is the sound output from
both channels (L, R)?
NO
YES
Is 5V present at IC365
pina 2, 3, 9 and 10?
Normal
NO
YES
NO
Is 9V present at IC901
pin 10?
YES
Check the connection
between IC901 pin10
and IC165/IC265 pin
16.
Check IC901 and its
peripheral circuits.
NO
YES
NO
Check the vicinity of
IC365.
YES
Check the speaker
connector and its
connection.
YES
Is 7V present at IC951
pina 3, 5, 7, 9, 17, 19
21 and 23?
NO
Check the power amp.
IC951.
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