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5-26
Flow Chart of Troubleshooting and Circuit Diagrams
VC1
VC2
Tx(GSM)
Tx(DCS)
RX
H
H
L
L
L
Antenna S/W Control Circuit
VC1 : GSM TX
VC2 : DCS TX
L
27PF
C267
C249
100uF
100PF
C657
C768
27PF
Q410
1
3
2
5.6nH
DTA114YET1
27PF
L599
C586
L614 NC
22PF
C821
4
0
R779
U204
RN4985
2
5
6
3
1
VCCO
10
6
VRAMP
5
VREG
22K
R617
GSMIN
7
GSMOUT
9
TXEN
3
4
VBATT
VCC1
81
2
VCC2
U476
2
BS
1
DCSIN
11
DCSOUT
0
R626
RF3110
C820
NC
C263
33PF
27PF
U690
A200
ANTENNA
C143
C144
100PF
33PF
0.5PF
C824
R764
22K
3.9nH
L612
L408
33PF
C264
C269
33nH
R240
10K
27PF
L606 NC
RN4985
U492
2
5
6
3
1
4
L409
33nH
CN1
KMS-157
2
A
C
3
G
1
G
4
1NF
C270
C538
10K
R238
2.4pF
7
G
91
2
G
GSM_RX
10
GSM_TX
5
VC1
2
11
VC2
U203
ES-A5010B
8
ANT
1
DCS_RX
3
DCS_TX
4
GG
6
G
2V8RF
+VBATT
VC2
3VTXEN2
BANDSEL
VC1
GSMTX
DCSTX
TXPOWER
DCSRX
GSMRX
VC1
VC2
VC1
2V8RF
TXEN2