LG GT350 Service Manual page 97

4. TROUBLE SHOOTING
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)
Checking Points
Table 3. Transceiver Output Operation
MODE
GMSK
8PSK
LGE Internal Use Only
VC2 FE2
33
VBIAS
34
VDDTX1V5
35
TX1
36
TX2
37
VDDTX2V8
R610 10
38
VDDMIX2V8
39
C622
GND3
40
0.22uF
GND4
41
1V53_VRF
2V85_VRF
C613 C618
0.22uF 0.1uF
Figure 20. Transceiver Output Circuit
Figure 21. Transceiver Output
Transceiver Output
Fixed
Ramp Burst Control
VDDRX2V8
VDDRX1V5
U601 VCO_RC
VDDVCO2V8
PMB6272
EN
VDDXO2V8
FSYS1
GND1
X601
4
GND2
1
HOT1
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Copyright © 2010 LG Electronics. Inc. All right reserved.
20
19
18
17
16
15
14
13
C617
R612
0.047uF
820
TSX-3225
3
HOT2
2
GND1
26MHZ
26MHZ_BT
RF_CLK
TP1(LBNAD_PAM_IN
TP2(HBNAD_PAM_IN
Only for training and service purposes