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LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
6. Trouble shooting
- 97 -
6.7 Microphone trouble
Check Points
-Microphone hole
-MICBIAS & Signal come from
-Audio signal level of the Microphone
-Soldering of components
MIC
MIC
27p
2
G1
3
G2
1
O
4
P
C107
SPM0204HE5-PB-3
MIC101
L102
100nH
C104
0.1u
C109
1u
C103
100p
C108
0.1u
C106
27p
EVLC14S02050
VA111
L101
100nH
100nH
L103
C105
0.1u
MIC_N
MIC_P
VMIC
START
Check the signal
TP1
level at each
side of MIC400.
Check mic. Bias
line
Yes
No
No
Check microphone sound
hole
Replace
microphone
(MIC101)
Replace Main PCB
Yes
Mic bias
TP2
ON
(2.5V)when
call?(L101)
Yes
MIC Bias
(L101)
MIC Signal
(C107, C108)
TP
TP1
1
TP
TP2
TP2
TP1
Содержание KC550
Страница 1: ...Date May 2008 Issue 1 0 Service Manual Model KC550 Service Manual KC550 Internal Use Only ...
Страница 129: ... 130 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 155: ...LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 156 ...
Страница 182: ...Note ...
Страница 183: ...Note ...