Model GC318
L3 Service Manual
12
）
Outgoing Audio / MIC (MIC no sound maintain)
Check MIC first
。
If MIC is ok
，
check R471
，
R472 fake soldering or not
，
check TVS703
，
TVS704 soldering
reversed? C406
，
C408 short circuit with earth
1.confirm G net or C net no sound
：
G net
：
G net mica no sound, first check micbias0 whether is high voltage, C401, C501 damaged or not
。
C net
：
C net mic no sound, first check micbias0 weather is high voltage, C410\C425 damaged or not
。
2. If above inspection no problem
，
check mic related circuit connectivity and components
；
excluding mic
components
，
still have problem
，
change cpu
，
G net mic no sound change MT6260,C net mic QSC1110
13
）
Incoming Audio / Earpiece
（
receiver no sound maintain
）
A
）
receiver no sound maintain
：
