Only For Training And Service Purposes - LG GD580 Service Manual

4.9.3 Microphone1 (Voice call),
Microphone2 (Speakerphone call, Voice Recorder, Video Recorder)
• Microphone Signal Flow
– MIC is enable by MIC Bias
– CCO1, MIC1P, MIC1N signals to AB3000
– CCO2, MIC4P, MIC4N signals to AB3000
• Check Points
– Microphone bias
– Audio signal level of the microphone
– Soldering of components
• Signal from the mic1
– MIC1
– CN100 on KEY FPCB
– CN521/522 on main board
– AB3000
• Signal from the mic2
– MIC
– C705/706 on Upper FPCB
– FB102/103 on Upper FPCB
– CN700 on Main FPCB
– FB503/505 on main board
– AB3000
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 107 -
4. Trouble Shooting
LGE Internal Use Only