LG KF700Q Service Manual page 87

4. TROUBLE SHOOTING
4.7.5 Microphone for headset
MIC for Head_Set path as below:
→
Insert Headset EAR_SENSE_N(pin8) go 0V
→
signal MSM6280.
EAR_SENSE_N(R420) is 0V?
YE S
M ICBIAS is 1.8V?
FB401?
LGE Internal Use Only
→
MSM6280 sense Head_Set insertion
F L40 1
L201?
Copyright © 2008 LG Electronics. Inc. All right reserved.
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EAR_MIC
Only for training and service purposes