JVC KD-LHX501 Service Manual page 30

5.5 Signal processing section
Is the sound output from
both channels (L, R)?
YES
Normal
1-30 (No.MA045)
NO
No sound from either
channel.
YES
Is 9V present at IC365
pin 16?
YES
Is the audio signal
(including sampling
output components)
output to IC191/IC291
pins 1 and 7 during
playback?
YES
Is the audio signal output
at IC171/IC271 pins 12
and 13 during playback?
YES
Check the power amp.
IC951.
Compare the L-ch and
NO
R-ch to locate the
defective point.
NO
Is 9V present at IC901
pin 10?
YES
Check the connection
between IC901 pin 10
and IC365 pin 16.
NO
Check IC191/IC291 and
its peripheral circuits.
NO
Check IC171/IC271 and
its peripheral circuits.
NO
Check IC901 and its
peripheral circuits.