LG HB620 Service Manual page 92

4.7.5 Microphone for headset
MIC for Head_Set path as below:
Insert Headset → EAR_SENSE_N(pin8) go 0V
EAR_MIC_P signal(MMI connector)
Try change the headset Try change the headset
EAR_SENSE_N is 0V? EAR_SENSE_N is 0V?
make some sound or make some sound or
Can you scoping some Can you scoping some
sound signal at FB503 sound signal at FB503
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
→ MSM6280 sense Head_Set insertion
→ MSM6280.
Start Start
Make a call Make a call
NO NO
(FB504) (FB504)
YES YES
voice to MIC voice to MIC
YES YES
YES YES
NO NO
Work well? Work well?
YES YES
END END
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4. TROUBLE SHOOTING
Change the Main bíd Change the Main bíd
NO NO
Change the Ear MIC Change the Ear MIC
Change the Main bíd Change the Main bíd
→
LGE Internal Use Only