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Flow Chart of Troubleshooting and Circuit Diagrams
9-28
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R621
3
VBATT
4
VCC
12
VRAMP
6
10
11
G
G
16
17
G
8
G
GND
5
7
GSM_IN
T
U
O
_
M
S
G
9
TXEN
PAM600
2
BS
DCS|PCS_IN 1
15 DCS|PCS_OUT
13
G
G
14
G
L609
C647
C613
C611
C619
C606
C644
C600
C617
C610
TA600
C605
C602
R601
L601
R600
VBAT
BAND_SEL
TX_EN
GSM_PA_PWR_CTL
DCS_TX
GSM_TX
GSMTX_IN
DCSTX_IN
C634 : COG type(30ppm)
C636 : CPPS type
Qualcomm recommend
C635 : COG type(30ppm)
C634
C640
1
VCC
3
VCTL
10
VSW1
11
VSW2
9
4
G
6
7
G
8
G
12
G
G
13
14
G
5
HIOUT
LOWOUT
VCO600
G
2
G
C628
R608
R611
C642
C648
R617
R615
C636
C643
C629
0
16
R
R619
R612
V_2.85TX
90
6
R
R614
R607
C635
R618
DCSTX_IN
TX_VCO_1_EN
TX_VCO_0_EN
MOD_CP
GSMTX_IN
TXVCO