LG Electronics LG-C320 service manual Receiver Path

4. TROUBLE SHOOTING

4.10 Receiver Path

QSC6270(3G disable) EAROP(EARON) Æ TP1_CN801(Main to Slide FPCB Connector) 2,3 PIN

ÆTP2_CN103(=Slide FPCB to Main PCB Connector) 2, 3 PIN Æ TP3_FB101, FB102(of F_SLIDE_ FPCB) TP4_CN101(= Receiver Pad of F_SLIDE_ FPCB )

START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
	Yes
Can you hear the tone?
No
The sine wave appears at	Yes
Receiver Pad(TP4)
No
The sine wave appears at	Yes
TP3_FB101, FB102?
No
The sine wave appears at	Yes
TP2_CN103 2,3 PIN?
No
The sine wave appears at	Yes
TP1_CN801 2,3 PIN?
No
Change the QSC6270
Change the Main PCB

END

Re-Solder Receiver Change the Receiver

Change F_SLIDE_FPCB

Re-Solder FB101,FB102 Change F_SLIDE_FPCB

Re-Connect CN103

Change F_SLIDE_FPCB

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