5. Trouble shooting
- 101 -
5.13.4 Checking PLL Control signals
Checking Points
Checking Flow
R416 (RF_EN)
R422 (RF_CLK)
R424 (RF_DATA)
U404
Check U404
Yes
No
No
Yes
Control Signal is OK.
See next page to check
Mobile SW & FEM.
No
Yes
Check U404
Check U404
EN Signal is OK?
DA(Data) is Normal?
CLK(Clock) is Normal?
RF Transceiver Circuit Diagram
Waveform
Transceiver
NA
C446
11
XO
XOX
12
VCO_RC
18
VDDDIG1V5
8
VDDDIG2V8
VD
19
VDDRX1V5
VDDRX2V8
20
17
VDDVCO2V8
15
VDDXO2V8
FSYS1
14
FSYS2
10
9
FSYS3
13
GND1
MB6272
U404
7
CLK
DA
6
EN
16
10p
C440
C442
0.1u
R424 0
C445
NA
0
R422
0
R418
470p
C433
C444
100p
R414
820
26MHz
X401
2
GND
3
OUT
VCC
4
VCONT
1
R421
0
VRF2V7
R417
1.8K
CLK
DA
26M_BB
AFC
RF_EN
RF_CLK
RF_DATA
Figure 7. Transceiver
Figure 8. Transceiver Circuit
Figure 9. PLL Control Waveform
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 ...