Model GC318
L3 Service Manual
Receiver no sound maintain
1. If receiver is damaged, change it
。
2...check U402, B703 B704 is fake soldering or not
。
C708
，
C709 whether short circuit with earth
，
RV400
，
RV402
whether soldered reversed
3..check receiver’s circuit
；
after above , still have problem, change CPU
b
）
earphone maintain
：
