LG KP270 Service Manual page 91

4. TROUBLE SHOOTING
4.11.1 Microphone for headset
Connect the phone to network
Equipment and setup call.
Audio path on the network equipment is
Is there headset detection
Is there analog signal Is there analog signal
Headset mic is work well? Headset mic is work well?
LGE Internal Use Only
start start
echo mode
YES
icon on the LCD?
YES
at C309, C310? at C309, C310?
YES
YES
END END
NO
Change headset Change headset
NO
Resolder C309, C310
or change headset
NO
Change the main board Change the main board
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