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4. Trouble Shooting
3.3.1.3 Checking RF signal path
P i
Test Point
TP2(DCS/PCS)
: L1104
TP4
TP2(GSM850/EGSM)
: L1112
TP3
:R1101
TP1
: C1101
TP4
:R1102
TP5
SKY77589
(U1100)
TP6
:R1105
TP2(DCS/PCS)
Circuit Diagram
TP5
:R1104
TP1
TP2(GSM850/EGSM)
TP3
TP4
TP5
TP6
0.5p
C1104
1
2
C1112
47p
1
2
DNI
L1154
2
1
C1116
22p
1
2
22p
C1115
1
2
22p
C1110
1
2
C1109
22p
1
2
DNI
C1106
1
2
C1107
DNI
1
2
C1105
22p
1
2
4
3
2
1
GND2
GND5
GND11
TRX1
ANT
TRX2
GND10
TRX3
VRAMP
PGND3
PGND2
PGND1
TRX4
TRX5
TRX6
PGND6
PGND5
PGND4
PGND7 PGND8 PGND9
PGND10
PGND11
PGND12
PGND13
PGND14
PGND15
PGND16
GND1
GND12
GND3
GND4
GND6
GND7
GND8
TX_HB_IN
TXEN
TX_LB_IN BS2 BS1 VBATT VCC
GND9
MODE
U1100
SKY77589
16
15
14
13
12
11
10
17
9
8
7
6
4
3
28
1
44
43
42
41
40
39
38
37
36
35
32
33
34
24 23
22
29
30
31
18
21
25
20
26
19
27
5
2
R1102
1K
2
1
R1101
1K
2
1
1K
R1104
2
1
R1105
1K
2
1
C1108
220p
1
2
2.2n
L1112
2
1
TX_MODULE_TRX3
TX_MODULE_TRX2
TX_MODULE_TRX1
TX_MODULE_TRX4
GSM_PA_EN
ANT0_SW_SEL_0
ANT0_SW_SEL_1
ANT0_SW_SEL_2
B2
B1
B8
B5
2mm
C1101
2
1
1.2N
C1102
2
1
3n
C1103
1
2
1.2p
L1104
2
1
2.2n
TP1
TP2(DCS/PCS)
TP2(GSM850/EGSM)
TP3
TP5
TP4
TP6