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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.11 Headset path
QSC6270(3G disable) HPH_OUT_L_P/N Æ TP1_C506,C507 Æ IC501(Audio Sub System) Æ
TP2_R504,R505 Æ TP3_FB504, FB505 Æ J501(=3.5pi Ear-jack)
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out and insert headset.
Can you hear the tone?
END
Yes
No
Change the Main board
Sine wave appears at
TP3_FB504, FB505
Re-solder or Change J501
Change the Main PCB
Yes
No
START
Sine wave appears at
TP2_R504, R505?
Re-solder the FB504, FB505
Change the Main PCB
Yes
No
Sine wave appears at
TP1_C506, C507?
Change the IC501
Yes
No