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Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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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
C233, C236
Make a phone call,
then check C231 mic bias signal
comes from U101?
NO
Change the microphone
YES
NO
Resolder component
1. Check mic Bias signal line
2. Change the U101
Check microphone sound hole
2. TROUBLE SHOOTING