LG C3400 Service Manual page 85
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Also See for C3400:
- User manual (297 pages) ,
- Specifications (4 pages) ,
- User manual (135 pages)
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4. Troubleshooting
Checking Flow
SETTING : After initialize Agilent 8960, Test EGSM, DCS mode
START
Voltage across C224
= DC 2.5V ?
YES
Check the signal
Level at each side
of MIC200.
Is it a few tens
mV AC?
YES
Check the soldering of
R208, R209, R212,
C207, C218
YES
Microphone will work
properly.
NO
Voltage VMIC of U102
= DC 2.5V?
YES
Resolder R200 & R205.
NO
Replace microphone
NO
Resolder component
- 84 -
NO
Replace U102
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