Headset Path - LG CU720 Service Manual

4.19 Headset path

MSM6280 HPH_R, HPH_L -> C501/C502 -> Headphone AMP(U501) -> R502/R503
-> CN501 (MMI Connector)
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out
and insert headset.
Can you hear the tone?
Sine wave appears at
Sine wave appears at
Change the Main board
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Only for training and service purposes
Start
YES
NO
YES
R502/R503?
NO
YES
C501/C502?
NO
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4. TROUBLE SHOOTING
END
Change the Headset
Check the Headphone Amp
LGE Internal Use Only