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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 MIC501.
Is it a few tens
mV AC?
Check the soldering of
R517, R518
(TP05,06)
Make a phone call,
then check C236(TP02) mic bias
comes from U201?
NO
Change the microphone
YES
NO
Re-solder component
1. Check mic Bias signal line
2. Change the U201
Check microphone sound hole