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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.11.5. Headset MIC(Voice call, Video Telephony )
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?
END
YES
YES
NO
Does the level of R626
Under 0.5Volt ?
NO
Does the level of R626
over 2.5 Volt ?
YES
YES
1
2
3
Change the Headset
And try again from the start
NO
Resolder R626, R636,U603
and try again.
If fail again,
Change the main B
’
d
Check the signal level
at U603 at the putting
Audio signal in MIC
YES
A few hundred of mV
of the signal measured
at U603 ?
Resolder U603
and try again.
If fail again,
Change the main B
’
d
Does it work properly ??
Try again from the start
YES
NO
Does the level of R636
over 2.1 Volt ?
YES
4
NO
Содержание TU750
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