LG GS290 Service Manual page 94

GS290 Operational Description
4.13.4. Checking Transceiver Output Signals
TP1(LBNAD_PAM_IN)
TP1(LBNAD_PAM_IN)
LBAND_PAM_IN
HBAND_PAM_IN
TP2(HBNAD_PAM_IN)
TP2(HBNAD_PAM_IN)
Table 3. Transceiver Output Operation
MODE
GMSK
8PSK
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Only for training and service purposes
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VC1
VC2
R507
10
C522
220n
Figure 20. Transceiver Output Circuit
Checking Points
Figure 21. Transceiver Output
Transceiver Output
Fixed
Ramp Burst Control
95/136
4. TROUBLE SHOOTING
FE2
33
VBIAS
34
VDDTX1V5
35
TX1
36
U500
TX2
37
VDDTX2V8
38 PMB6272
VDDMIX2V8
39
GND3
40
GND4
41
TP1(LBNAD_PAM_IN
TP2(HBNAD_PAM_IN
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Revision B
VDDRX2V8
20
VDDRX1V5
19
VCO_RC
18
VDDVCO2V8
17
EN
16
VDDXO2V8
15
FSYS1
14
GND1
13
LGE Internal Use Only
LGE Property