5. Trouble shooting
- 112 -
5.13.13 Checking FEM & Mobile SW
Mobile SW & FEM Circuit Diagram
GSM850
DCS
LB RF Input
Front End Module
EGSM
PCS
HB RF Input
C415
0.1u
C405
VRF2V85
C418
C403
0.75p
C413
L403
2.2nH
C416
KMS-506
SW401
ANT
G1
G2
RF
0
R403
C414
C417
C412
C419
6
TX1G
8
TX2G
22
VCTRL1
VCTRL2
21
VCTRL3
20
VDD
3
EGSM_RX-
16
GMS_RX-
18
GND1
2
GND10
25
26
GND11
GND2
4
5
GND3
GND4
7
9
GND5
GND6
10
GND7
11
23
GND8
GND9
24
19
13
PCS_RX-
12
U401
YGHF-S006A
ANT
1
15
DCS_RX-
14
17
33p
C401
Checking Points
SW401
C401
R436 (ANT_SW2)
R437 (ANT_SW1)
R435 (ANT_SW3)
Figure 30. Mobile SW & FEM Circuit
Figure 31 Mobile SW & FEM
Table 5. FEM TX Control Logic
RX Mode
EGSM
DCS
PCS
ANT_SW1
On
On
On
ANT_SW2
Off
On
On
ANT_SW3
Off
Off
Off
Summary of Contents for Prada KE850
Page 1: ...Date March 2007 Issue 1 0 Service Manual Model KE850 Service Manual KE850 ...
Page 3: ... 4 ...
Page 5: ... 6 ...
Page 71: ...4 PCB layout 72 Main PCB bottom Main PCB bottom placement ...
Page 115: ... 116 6 Download S W upgrade 6 Press the START button ...
Page 117: ...6 Download S W upgrade 118 KE850 KE850P40 7 V09a KE850 KE850P40 7 V09a ...
Page 127: ... 128 LGMC 8 pcb layout ...
Page 128: ... 129 LGMC 8 pcb layout ...
Page 129: ... 130 LGMC 8 pcb layout ...
Page 130: ... 131 LGMC 8 pcb layout ...
Page 131: ... 132 8 pcb layout ...
Page 132: ... 133 8 pcb layout ...
Page 133: ... 134 8 pcb layout ...
Page 134: ... 135 8 pcb layout ...
Page 135: ... 136 8 pcb layout ...
Page 136: ... 137 8 pcb layout ...
Page 137: ... 138 ...
Page 149: ... 150 ...
Page 151: ... 152 ...
Page 172: ...Note ...
Page 173: ...Note ...