
- 104 -
LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
SETTING : After initialize Agilent 8960, Test EGSM900, DCS mode ( or GSM850, PCS mode )
CHECKING FLOW
START
NO
YES
Microphone will work
properly.
YES
Check the signal
Level at each side of TP4.
Is it a few tens mV AC?
Check the soldering of
TP2/TP3
Make a phone call,
then check TP1 mic bias signal
comes from U100?
NO
Change the microphone
YES
NO
Resolder component
1. Check mic Bias signal line
2. Change the U100
Check microphone sound hole