LG KF750 Service Manual page 117

4. TROUBLE SHOOTING
4.11.3 Microphone (Voice call, Voice Recorder, Video Recorder)
Microphone Signal Flow
•
- MIC is enable by MIC Bias
- CCO1, MIC1P, MIC1N signals to ABB3000 (Veronica )
• Check Points
- Microphone bias
- Audio signal level of the microphone
- Soldering of components
• Signal from the mic
- MIC →
- C104 on mainkey PCB →
- C106, C108 on mainkey PCB →
- R103, R104 on mainkey PCB →
- Veronoca →
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