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4.4 Checking GSM TX Module(GSM PAM + FEM) Block
GSM_TX
C170
1.8p
PA_RAMP
DCS_PCS_TX
LGE Internal Use Only
tP1
L133
1.2n
C171
1.8p
PA_POW_DET
SS
VBAT
DRW
CLK
VSPI
C178
1u
C180
15p
C185
15p
Schematic of the TX Module
VBAT
TP1
C150
C151
C152
22u
10n
22p
25
TX_LB
24
GND_LB
23
DET
22
SS
21
DRW
U104
20
CLK
19
VSPI
18
C179
0.1u
GND_SPI
17
VCMOS
16
VRAMP
15
GND_HB
14
TX_HB
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4. TROUBLE SHOOTING
VBATT(TP1)
1
ANT
2
GND1
3
RX_850
RX_L1
4
GND2
5
RXTX_L2
6
GND3
7
RXTX_H
8
GND4
9
RXTX_M1
10
GND5
11
RX_M2
RX_1900
12
RX_1800
RX_M3
Only for training and service purposes
- Quick Links:
- Circuit Diagram
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Troubleshooting
