Headset Path - LG CU400 Service Manual

4. TROUBLE SHOOTING

4.15 Headset path

MSM6280 HPH_R, HPH_L → C302/C303 → R300/R302 → CON300(Earjack)
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out
and insert headset.
LGE Internal Use Only
Start
Can you hear the tone?
NO
Sine wave appears at
R300/R302?
NO
Sine wave appears
at C302/C303 ?
NO
Change the Main board
YES
YES
Change the Head_Set
YES
Re-solder C302/C303
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