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1-30 (No.MA063)
5.5 Signal processing section
No sound from either
channel.
Is 9V present at IC161
pin 26?
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 IC572 pins 1
and 7 during playback?
Is the audio signal
output at IC161 pins 18
to 21 during playback?
Normal
NO
YES
NO
Is 9V present at IC901
pin 13?
YES
Check the connection
between IC901 pin 13
and IC161 pin 26.
Check IC901 and its
peripheral circuits.
NO
YES
NO
Check IC572 and its
peripheral circuits.
YES
NO
Check IC161 and its
peripheral circuits.
Check the power amp.
IC301.
YES
Is the audio signal output
at IC361/IC381 pins 12
and 13 during playback?
YES
NO
Check IC361/IC381 and
its peripheral circuits.