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4. TROUBLE SHOOTING
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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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
C260, C261
Make a phone call,
then check C258 mic bias signal
comes from U100?
NO
Change the microphone
YES
NO
Resolder component
CHECKING FLOW
1. Check mic Bias signal line
2. Change the U100
Check microphone sound hole
4. TROUBLE SHOOTING
4.12 Microphone Trouble