Headset Path - LG KU380 Service Manual

4.17 Headset path

MSM6245 HPH_R, HPH_L → C402/C401 → R407/R406 → CN400 (MMI Connector)
Connect the phone to network
equipment and setup call.
Setup 1KHz tone out
and insert headset.
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Only for training and service purposes
Start
Can you hear the tone?
NO
Sine wave appears at
R407/R406?
NO
Change the Main board
4. TROUBLE SHOOTING
YES
END
YES
Change the Headset
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LGE Internal Use Only