LG KM500 Service Manual page 52

4.2.2.1 Mobile Switch & PAM & FEM Circuit
Mobile S witc h
SW401 between C418
and L404 Is s hort?
YES
FEM
C72
4
Check Co ntro l Sign al
C425,C427
C72
5
YES
Check U4 03
YES
C73 C72
Check R4 20RF LEVEL
≥ 0dBm
3 2
C73 C71
YES
4 1
Re-download SW & CAL
≥
TX
<GSM900>
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
NO
Replace SW400
NO
Check U403
NO
Check U403
NO
Check U401
LB_ HB
TX_ANT_SW_EN
- 53 -
4. Trouble Shooting
≥
C711
TX
<PCS1900>
LGE Internal Use Only