LG KT520 Service Manual page 112

4.10.5 Headset MIC(Voice call, Video Telephony )
START
Insert Headset.
Does the Headset icon
display on the main LCD?
3
Check the signal level
at C406 at the putting
Audio signal in MIC
A few hundred of mV
5
Of the signal measured
at C406 ?
Change the main Bíd
Does it work properly ??
END
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Only for training and service purposes
NO
YES
Change the main B,d
6
NO
YES
NO
Try again from the start
YES
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4. TROUBLE SHOOTING
1
Does the level of R640
under 0.5Volt ?
YES
2
YES
Does the level of R412
4
And try again from the start
Resolder C406
and try again.
If fail again,
Change the main Bíd
NO
over 2.0Volt ?
N0
Resolder R640,
LGE Internal Use Only