4. TROUBLE SHOOTING
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Only for training and service purposes
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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
C147, C148
(TP06,05)
Make a phone call,
then check L205(TP02) mic bias
comes from U102?
NO
Change the microphone
YES
NO
Re-solder component
1. Check mic Bias signal line
2. Change the U102
Check microphone sound hole
2. TROUBLE SHOOTING