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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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4. TROUBLE SHOOTING
4.11.4. Headset Receiver (Voice call,MP3 )
START
Connect the phone to network
Equipment and setup call
Setup 1KHz tone out
Insert Headset.
Does the Headset icon
display on the main LCD?
Can you hear sine wave
out of the receiver ?
Change the main B
’
d
END
YES
YES
YES
NO
NO
Does the level of R626
Under 0.5Volt ?
NO
Does the level of R626
over 2.5 Volt ?
YES
Yes
Change the main B,d
Does the sine wave appear
at C345, C346?
NO
Resolder CN601 Pins
or change the Headset
1
2
3
1. Resolder R626, R636, U603
2. change the Headset
And try again from the start
Does the sine wave appear
At FB302, FB303 ?
YES
Change the FB302, FB303
NO
YES
4
Resolder R626, R636
and try again.
If fail again,
Change the main B
’
d
1