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5.5
Signal processing section
Is the sound output from
both channels (L, R)?
YES
Normal
1-26 (No.49871)
NO
No sound from either
channel.
YES
Is 9V present at IC901 pin
"10"?
YES
Is the audio signal
(including sampling output
components) output to
IC801 pins "39" and "40"
during playback.
YES
Is the audio signal output
at IC301 pins "1"
and "32" during playback?
YES
Check the muting circuit.
NO
Compare the L-ch and R-ch
to locate the defective point.
YES
NO
Check the vicinity of the
IC321 audio power supply.
NO
Check IC801 and its
peripheral circuits.
NO
Check IC301 and its
peripheral circuits.
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