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4.12 Microphone Trouble
CHECKING FLOW
SETTING : After initialize Agilent 8960, Test GSM850, PCS mode
Check microphone sound hole
Make a phone call,
then check TP1 mic bias signal
comes from U102 ?
Microphone will work
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
NO
YES
Check the signal
Level at TP3
NO
of MIC200.
Is it a few tens
mV AC?
YES
properly.
1. Check mic Bias signal line
2. Change the U102
NO
Resolder TP2 and TP3
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4. TROUBLE SHOOTING
Replace the MIC200
LGE Internal Use Only
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