LG GB220 - Page 95

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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
START
NO
YES
Microphone will work
properly.
SETTING : After initialize Agilent 8960, Test EGSM900, DCS mode ( or GSM850, PCS mode )
YES
Check the signal
Level at each side
of MIC200.
Is it a few tens
mV AC?
Check the soldering of
R202, R203
Make a phone call,
then check C202 mic bias signal
comes from U101?
NO
Change the microphone
YES
NO
Resolder component
CHECKING FLOW
1. Check mic Bias signal line
2. Change the U101
Check microphone sound hole