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5. Trouble shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5.15.4 Checking FEM & Mobile SW
FEM TX Control Logic
Mobile SW & FEM Checking Points
TX Mode EGSM DCS PCS
ANT_SW1 On Off Off
ANT_SW2 Off On On
RF
PAD601
PAD600
C622
33p
0.5p
C634
0
R608 C631
5p
33p
C627
12nH
L605
13
GSM850_900TX
GSM900RX1
3
4
GSM900RX2
NC1
19
NC2
20
16
VC1
VC2
10
17
ANT
GND1
9
GND2
12
14
GND3
GND4
15
18
GND5
GSM1800RX1
5
6
GSM1800RX2
GSM1800_1900TX
11
7
GSM1900RX1
GSM1900RX2
8
GSM850RX1
1
2
GSM850RX2
NA
L604
LMSP43NA-782
U601
PAD602
22p
C632
CN600
MM8430-2600RB3
3
GND1
4
GND2
GND3
5
GND4
6
1
IN
OUT
2
0.75p
C633
VC1
VC2
TP2_C625 (ANT_SW2)
U600
TP5~8
TP1_C621 (ANT_SW1)
TP10
CN600
TP9
Mobile SW & FEM Circuit
TP10
TP9
TP2
TP1
TP5,6,7,8