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4. TROUBLE SHOOTING
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Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4.15 Receiver Path
QSC6270 EARON/EAROP -> RCV_P ( TP1 ), RCV_N ( TP2 ) -> Audio Sub System (M500)
-> SPK_P( TP3 ), SPK_N ( TP4 )-> Speaker
START
Can you hear the tone?
END
The sine wave appears at
TP1, TP2?
Yes
No
No
Change the Main board
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Change the SPK
Yes