Check audio speaker is working.
OK
NG
Failure Point
1) Audio output wire is disconnected from the interface
board P310 to key function board P601.
2) Printed wire broke between P600 and P601 and P602
for the key function board.
3) Audio speaker unit is disconnected from the P601
and P602.
Failure Point
Audio speaker unit "L" or "R" is failure.
Check I310 pin 14 SHOUTDOWNn if is low
level.
NG
OK
Failure Point
1) Printed wire broke between I306 pin 51 and Q309
and I310 pin 14.
2) R392, R390, R391 is open or short.
3) C400 is short.
4) Q309 is filure.
5) I306 is failure.
Continue
Check I310 pin 10, 12, 20, 2 audio signal output.
NG
OK
Failure Point
1) Printed wire broke between I310 pin10, 12, 20, 2 and
P310pin1,2,3,4.
2) I316 is failure.
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