- 95 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
`]VX[`
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 MIC201.
Is it a few tens
mV AC?
Check the soldering of
C224, C219 (TP02,03)
Make a phone call,
then check R217(TP01) mic bias
comes from U102?
NO
Change the microphone
YES
NO
Re-solder component
1. Check mic Bias signal line
2. Change the U102
Check microphone sound hole
2. TROUBLE SHOOTING