LG KM710 Service Manual - Page 90
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4. Trouble Shooting z Ear-Mic Headset Operation scheme is shown below. HSMICIP C307 0.1u C308 120p VRIO R302 220K HOOK_DETECT U302 5 4 1 VCC OUT GND 3 VINVIN+ 2 LMV7291MGX-NOPB R308 10K VRIO VRIO HOOK_EN U301 1 6 2S B1 5 3 VCC GND 4 A B0 FSA4157L6X R304 1K LAST CALL START Check the Ear_Mic Headset trouble YES Check Soldering of R302,R304,R308,U301 Is it O.K? YES U103(DBB) is broken. Change the board. NO Go to EAR-MIC Headset Mic trouble shooting NO Re-solder R302,R304,R308,U301 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 91 - LGE Internal Use Only
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4. Trouble Shooting
z
Ear-Mic Headset Operation scheme is shown below.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
LAST CALL
LMV7291MGX-NOPB
U302
GND
2
OUT
1
5
VCC
VIN+
3
4
VIN-
120p
C308
3
A
B0
4
B1
6
5
GND
1
S
2
VCC
10K
R308
FSA4157L6X
U301
R302
220K
VRIO
VRIO
0.1u
C307
1K
R304
VRIO
HOOK_EN
HOOK_DETECT
HSMICIP
Re-solder
R302,R304,R308,U301
N
O
START
YE
S
Check Soldering
of R302,R304,R308,U301
Is it O.K?
U103(DBB) is broken.
Change the
board.
Go to EAR-MIC Headset
Mic trouble shooting
N
O
YE
S
Check the Ear_Mic Headset
trouble