No Audio Signal Come Out On Speaker - Pioneer XC-LA21 Service Manual

XC-LA21

6. No audio signal come out on speaker

E
Check the pins 9 (B)
and 10 (A) of the IC201. Is the value is
corrected according to
Table 1
YES
Do the corresponding Audio input
signal on IC201 correctly ?
YES
Do the audio output from the pins
3 and 13 of IC201correctly ?
YES
Is the pin 8 (MUTE) of CN202
high ?
NO
Is the pin 3 of CN204 in 8V ?
YES
Is the pins 18, 19
and 20 of the IC202 had correct
waveform when the volume
is adjusting ?
YES
Please check the corresponding
circuit of the amplifier.
Table 1
Channel
Pin 9 of IC201 Pin 10 of IC201
Power OFF
Tuner
CD
AUX
40
NO
Please check the corres-
ponding circuit and connec-
tion.
NO
Check the connection of
the audio signal input.
NO
The IC201 broken.
Please check 16P DC
SUPPLY.
YES
Please check the connec-
tion of the CN202 and CN206
CN205 and CN401.
NO
Please check IC301 and
its corresponding circuit.
NO
Please check the corres-
ponding circuit, pins 8, 9
and 25 of IC401 and its
connection.
(B) (A)
0 0
0 1
1 0
1 1