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4.7.5 Checking RF Rx Block
Schematic of GSM900/DCS/PCS Rx Block
4. TROUBLE SHOOTING
- 90 -
TP1. DCS RX INPUT
TP2. PCS RX INPUT
TP3. GSM RX INPUT
TP1
TP2
TP3
Rev.C
Rev.D
EGSM
DCS
Rev.C
PCS
R1011K
NA
C191
C442 5.6p
10nH
5p
L116
R1001K
C440
L406 2.7nH
C124
100p
NA
C120
0.5p
C190
C105
NA
5pC439
NA
C116
1.5nH
L403
L115
18nH
C123
0.01u
L111
5.6nH
100nH
L102
C121
33u
5.6pC443C110
33p
21
14
GSM18001900_TX
GSM1800_RX1
1
GSM1800_RX2
2
GSM1900_RX1
3
4
GSM1900_RX2
GSM900_RX1
5
6
GSM900_RX2
16
GSM900_TX
VDD
19
WCDMA2100
9
ANT
11
CTRL1
18
CTRL2
22
7
GND1
GND10
23
GND2
8
GND3
10
GND4
12
GND5
13
15
GND6
17
GND7
GND8
20
GND9
U500
D5011
33p
C109
2.7nHL405
+VPWR
GSM_PA_RAMP
ANT_SEL1
ANT_SEL0
TP1
TP2
TP3