JVC KD-AR270 Service Manual page 19

5.5 Signal processing section
5.5.1 Signal processing section
(For KD-AR270,KD-G220,KD-G227,KD-G323,KD-G324,KD-G325 and KD-G326)
Is the sound output from
both channels (L, R)?
NO
No sound from either
channel.
NO
Compare the L-ch and
R-ch to locate the
defective point.
5.5.2 Signal processing section
(For KD-G321,KD-G322 and KD-G327)
Is the sound output from
both channels (L, R)?
NO
No sound from either
channel.
NO
Compare the L-ch and
R-ch to locate the
defective point.
YES
Normal
YES
Is 9V present at pin 24
of IC161?
NO
Is 9V present at pin 13
of IC901?
NO
Check IC901 and its
peripheral circuits.
YES
Normal
YES
Is 9V present at pin 32
of IC171?
NO
Is 9V present at pin 13
of IC901?
NO
Check IC901 and its
peripheral circuits.
Is the audio signal
(including sampling
YES
output components)
output to pins 1 and 7 of
IC581 during playback?
NO
Check IC581 and its
peripheral circuits.
YES Check the connections
between pin 24 of IC161
and pin 13 of IC901.
Is the audio signal
(including sampling
YES
output components)
output to pins 1 and 7 of
IC581 during playback?
NO
Check IC581 and its
peripheral circuits.
YES Check the connections
between pin 32 of IC171
and pin 13 of IC901.
Is the audio signal output
YES
at pin 18 and pin 19 of
IC161 during playback?
NO
Check IC161 and its
peripheral circuits.
YES
Check the power
amplifier IC301.
Is the audio signal output
YES
at pin 18 and pin 19 of
IC171 during playback?
NO
Check IC171 and its
peripheral circuits.
Check the power
amplifier IC301.
(No.MA236)1-19
YES