LG F3000 - Page 87

4. TROUBLESHOOTING
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SETTING : After initialize Agilent 8960, Test EGSM, DCS, PCS mode
START
Voltage across C118
is about 2.5V?
No
MIC Bias Voltage
Check the signal level at
each side of MIC201.
Is it a few tens mVAC?
Replace the microphone
Check the soldering of
R207, R209, C211
Resolder R207, R209, C211
MIC will work properly.
Change Main board.
Replace U101.
Voltage VMIC of U101
is about 2.5V?
Resolder R200 & R205.
No
Yes
No
Yes
Yes
No
Yes
Checking Flow