LG PRADA KE850 - Page 107

5. Trouble shooting
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5.13.11 Checking Transceiver Output Signals
Checking Points
RF Transceive
G
E
TX1
36
37
TX2
VBIAS
34
VDDBIAS2V8
31
VDDDIG1V5
8 5
VDDDIG2V8
39
VDDMIX2V8
35
VDDTX1V5
VDDTX2V8
38
32
FE1
33
FE2
9
26
GND2
GND3
40
41
GND4
RX1
29 30
RX1X
RX2
27 28
RX2X
24
RX3X
25
PMB6272
U404
1
A AX
2 3
B BX
4 7
CLK DA
6
NA
C449
0R425
2.2u
C435
R415 10
NA NA
C455C454
4700p
C424
NA
C443
VRF2V85
2.2u
C434
NA
C448
R419
0
R427
0
U401
MODE Transceiver Output
GMSK Fixed
8PSK Ramp Burst Control
Figure 22. Transceiver Output Circuit
Figure 23. Transceiver Output
Table 3. Transceiver Output Operation