LG B2050 Service Manual - Page 82
SETTING : After intialize Agilent 8960, Test EGSM, DCS mode
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4 . TROUBLE SHOOTING Checking Flow SETTING : After intialize Agilent 8960, Test EGSM, DCS mode START NO NO Voltage across R200 Voltage VMIC of U101 Replace U101 = DC 2.5V? = DC 2.5V? YES YES Resolder R200 & R203 Check the signal NO Level at each side Replace microphone of MIC200 mV AC? YES Check the soldering of NO R207, R208, R210, C210, C211 YES IMicrophone will work properly Resolder component - 81 -
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- 81 -
4 . TROUBLE SHOOTING
Checking Flow
START
Voltage across R200
= DC 2.5V?
Voltage VMIC of U101
= DC 2.5V?
Check the signal
Level at each side
of MIC200
mV AC?
Check the soldering of
R207, R208, R210,
C210, C211
IMicrophone will work
properly
Resolder component
Replace microphone
Resolder R200 & R203
Replace U101
YES
YES
NO
NO
NO
NO
YES
YES
SETTING : After intialize Agilent 8960, Test EGSM, DCS mode