1-16 (No.MA233)
5.1.5 Signal processing section
No sound from either
channel.
Is 9V present at pin 26
of IC301?
Compare the L-ch and
R-ch to locate the
defective point.
Is the sound output from
both channels (L, R)?
YES
NO
Is the audio signal
(including sampling
output components)
output to pins 1 and 7 of
IC151 during playback?
Is the audio signal output
at pin 22 and pin 25 of
IC301 during playback?
Normal
YES
NO
YES
YES
NO
Check IC151 and its
peripheral circuits.
NO
Check IC301 and its
peripheral circuits.
YES
Check the power
amplifier IC321.
NO
Is 9V present at pin 10
of IC901?
YES Check the connections
between pin 26 of IC301
and pin 10 of IC901.
NO
Check IC901 and its
peripheral circuits.
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