1-32 (No.MA084)
5.5
Signal processing section
No sound from either
channel.
Is 9V present at IC365
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 the audio signal
(including sampling
output components)
output to IC361 pins 1
and 7 during playback?
Is the audio signal
output at IC365 pins 12
to 15 during playback?
Normal
NO
YES
NO
Is 9V present at IC901
pin 10?
YES
Check the connection
between IC901 pin10
and IC365 pin 16.
Check IC901 and its
peripheral circuits.
NO
YES
NO
Check IC361 and its
peripheral circuits.
YES
NO
Check IC365 and its
peripheral circuits.
Check the power amp.
IC951.
YES
Is the audio signal output
at IC171/IC271 pins 12
and 13 during playback?
YES
NO
Check IC171/IC271 and
its peripheral circuits.
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