Headset Microphone - LG CU405 Service Manual

4. TROUBLE SHOOTING

4.18 Headset microphone

Headset → C300 → MIC2P(MSM6280)
Change the headset and retry
LGE Internal Use Only
Start
Make a call
NO
EAR_SENSE_N
(R301) is 0V?
Yes
VREG_MSMP is biased
by 2.6V? (FB303)
Yes
Sine wave appears at
C300 ?
Yes
Change the Main B'd
- 106 -
OK
END
YES
NO
Change the headset or
SUB board and retry.
NO
Change MAIN board
NO
Change the headset or
SUB board and retry.
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NO
Only for training and service purposes