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Only for training and service purposes
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4. TROUBLE SHOOTING
ʹΠΡΪΣΚΘΙΥ͑ι ͣͨ͑͡͡ͽ͑ͶΝΖΔΥΣΠΟΚΔΤ͑͟ͺΟΔ͑͑͟ͲΝΝ͑ΣΚΘΙΥ͑ΣΖΤΖΣΧΖΕ͑͟
ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
83/140
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 MIC201.
Is it a few tens
mV AC?
Check the soldering of
R212, R213, C230, C215
Make a phone call,
then check C231 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
2. TROUBLE SHOOTING