(No.MA233)1-19
5.2.5 Signal processing section
No sound from either
channel.
Is 9V present at pin 32
of IC171?
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
IC581 during playback?
Normal
YES
NO
YES
NO
Check IC581 and its
peripheral circuits.
NO
Is 9V present at pin 13
of IC901?
YES Check the connections
between pin 32 of IC171
and pin 13 of IC901.
NO
Check IC901 and its
peripheral circuits.
Is the audio signal output
at pin 14,pin 15, pin 18
and pin 19 of IC171 during
playback?
YES
NO
Check IC171 and its
peripheral circuits.
YES
Check the power
amplifier IC301.
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