Checking The Audio Circuit [Option] - Acer AL1702 Service Manual

10. Checking the Audio circuit [OPTION]

Check the Audio signal input to P309
Check the 12V is input to I310 pin5, 6, 7, 8.
Check the 12V is input to I311 pin15, 16.
Check the VOLUME PWM signal input to I311
Check the MUTE signal is input to I311 pin12 at
Check the Audio output signal to Speaker.
Failure Point
I311 failure.
Page 22
NG
OK
NG
OK
NG
OK
pin6.
NG
OK
high level.
NG
OK
NG
OK
Failure Point
1) Audio wire disconnection.
2) Audio Jack board failure.
Failure Point
1) Printed wire broke between P301 pin7. 8
and I310 pin1, 2, 3.
2) FB320 open.
3) Printed wire broke between I307 pin32 and
I310 pin4.
4) Q311 failure.
5) I310 failure.
Failure Point
1) Printed wire broke between I310 pin5, 6, 7,
8 and I311 pin15, 16.
2) L301 open.
3) C412 short.
Failure Point
1) Printed wire broke between I305 pin74 and
I311 pin6.
2) C422 short.
3) I305 failure.
Failure Point
1) Prined wire broke between I307 pin33 and
I311 pin12.
2) C414 short.
3) I307 failure.
Failure Point
1) Speaker failure.
2) Prined wire broke between I311 pin14, 17
and P310.
3) C415, C418 open or short.
AL1702