Only For Training And Service Purposes - LG GB220 Service Manual

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

Only for training and service purposes

Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes