LG KF390 Service Manual page 107
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Also See for KF390:
- User manual (90 pages) ,
- Service manual (17 pages) ,
- User manual (196 pages)
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4. TROUBLE SHOOTING
4.12.7 Ear-Mic Microphone Troubleshooting
Receiver : MSM6280 HPH_R, HPH_L → C404/405 → R403 / R404 → CN400 → Headset Receiver
Microphone : MSM6280 MIC2P → C401 → CN400 → Headset Microphone
*( PM6658 'HSET_BIAS' feed bias voltage to microphone through load resistor(R401) )
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Troubleshooting
