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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 106 -
4.18 Headset microphone
Headset
→
C300
→
MIC2P(MSM6280)
Start
EAR_SENSE_N
(R301) is 0V?
Yes
END
Make a call
Change the headset or
SUB board and retry.
VREG_MSMP is biased
by 2.6V? (FB303)
Change the Main B'd
Yes
OK
NO
NO
NO
Change the headset and retry
YES
Change MAIN board
NO
Sine wave appears at
C300 ?
Change the headset or
SUB board and retry.
NO
Yes
Summary of Contents for CU405
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model CU405 Service Manual CU405 Internal Use Only ...
Page 175: ...Note ...
Page 176: ...Note ...