LG KE520 Service Manual page 55

4. TROUBLE SHOOTING
4.2.1.3 Mobile Switch & PAM & FEM Circuit
1
SW400
C423
FL401
C425
3
4
U401
U400
GSM900
LGE Internal Use Only
C421
2
L406 L405
U402
C428
C425
X400 U403 U404
FEMC1/FEMC2
(C423/C425)
TX_BAND(R418)
TX_ON(C421)
- 56 -
NO
Check SW400
(Mobile switch)
OK
NO
Check L405, L406
(With spectrum analyzer)
OK
NO
Check C421
(With spectrum analyzer)
OK
NO
Check Control Signal
C423,C425,C428,C431
OK
Re-download SW & CAL
DCS
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Replace
SW400
Check
U402
Check
FL400
Check U401