Only For Training And Service Purposes - LG KP210 Service Manual

4. TROUBLE SHOOTING
CHECKING FLOW
SETTING : After initialize Agilent 8960, Test GSM850, PCS mode
START
Check microphone sound hole
Make a phone call,
then check R227 mic bias signal
comes from U102?
YES
Check the signal
Level at each side
of MIC200.
Is it a few tens
mV AC?
YES
Check the soldering of
R231, R235 & R236
YES
Microphone will work
properly.
LGE Internal Use Only
NO
1. Check mic Bias signal line
2. Change the U102
NO
Change the microphone
NO
Resolder component
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Only for training and service purposes