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Flow Chart of Troubleshooting
7-14
(3.0V)
(3.0V)
6.8nH
100PF
C431
100PF
C402
22UF
C433
6.3V
C410
18PF
100PF
C430
C436
33PF
22PF
C435
L403
NC
L404
26
XIN
8
XOUT
27
_PDN
10
_SEN
12
C441
10NF
14
SDO
11
TXIN
5
TXIP
4
TXQN
7
TXQP
6
VDD
9
VDD
32
XEN
16
RFOD
22
RFOG
23
RXIN
3
2
RXIP
RXQN
1
RXQP
28
SCLK
13
SDI
GND
GND
35
36
GND
RFIDN
19
RFIDP
18
RFIGN
21
RFIGP
20
RFIPN
17
RFIPP
U404
DIAG1
24
DIAG2
25
GND
15
GND
29
30
GND
GND
31
33
GND
34
27K,1%
R402
SI4205-BMR
C449
10NF
10NF
L401
C418
GSM-RX
2
3
GSM-RX
GSM-TX
13
VC1
1
6
VC2
27nH
ANT
DCS-RX
4
5
DCS-RX
DCS-TX
G
7
G
91
0
GG
12
14
G
VRF
U402
LMSP54KA-249
8
10NF
C419
100NF
10NF
C422
R423
C443
10K
4
1
VT
C417
22UF
6.3V
OSC401
VC-TCXO-208C3
2
GND
3
OUT
VCC
NC
C437
C440
100PF
VRF
C407
C401
22PF
100PF
C409
C439
18PF
C413
1PF
1PF
3PF
C450
R425
0
C452
NC
33nH
C451
C438
10NF
GND
16
17
GND
GSM850/900IN
1
GSM850/900OUT
14
6
TX_EN
VBATT
5
VCC
12
VRAMP
4
DCS/PCSIN
9
DCS/PCSOUT
10
GND
23
GND
GND
81
1
GND
GND
13
15
GND
U403
TQM7M4022
BS
7
3.9nH
L405
G1
4
G2
IN
1
OUT
2
12
R422
MS-156(02)
U401
3
C442
10NF
C406
100UF
6.3V
VBAT
ANT2
C404
NC
22nH
L402
R421
560
2.2K
R420
100PF
C429
47PF
C434
R424
C408
1PF
1PF
C411
100
C412
0.5PF
C423
100PF
0
R426
NC
C453
RXTXIN
RXTXIP
RXTXQN
RXTXQP
SERCLK
SERDAT
XOENA
CLK13M_RF
13MHZ_SI
SI_EN
SERLE
GSM_PAM_IN
DPCS_PAM_IN
GSM_LNA_IN_P
GSM_LNA_IN_N
DCS_TX_EN
DCS_LNA_IN_P
DCS_LNA_IN_N
GSM_TX_OUT
ANT
DPCS_PAM_IN
TX_BAND_SEL
AFC
CLK13M_RF
CLK13M_MC
CLK13M_TR
13MHZ_SI
CLK13M_YMU
GSM_TX_OUT
DCS_TX_OUT
DCS_LNA_IN_P
DCS_LNA_IN_N
GSM_LNA_IN_N
GSM_LNA_IN_P
GSM_TX_EN
DCS_TX_OUT
TXPOWER
TX_EN
GSM_PAM_IN