LG GD510 Service Manual page 86

GD510 Operational Description
5.13.4. 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)
VRF_1V5
MODE
GMSK
8PSK
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Only for training and service purposes
C624 C605
100n 4.7n
R605 10
C622 C604
100n 100n
VRF_2V85
R601 10
C607 C648
220n
Figure 20. Transceiver Output Circuit
Checking Points
Figure 21. Transceiver Output
Table 3. Transceiver Output Operation
Transceiver Output
Fixed
Ramp Burst Control
C618 C634 C612
3p 3p 3.9p
L603 L606
18n 15n
FE2
33
VBIAS
34
VDDTX1V5
35
TX1
36
TX2
PMB6272
37
VDDTX2V8
38
VDDMIX2V8
39
GND3
40
GND4
41
100n
TP1(LBNAD_PAM_IN)
TP2(HBNAD_PAM_IN)
92/113
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C611
C629 C609 C617
3.9p 2.2p 2.2p 2.4p
L601
5. Trouble shooting
L602
5.1n
4.7n
Revision A
VDDRX2V8
20
VDDRX1V5
U602
19
VCO_RC
18
VDDVCO2V8
17
EN
16
VDDXO2V8
15
FSYS1
14
GND1
13
X601
4
GND2
1
HOT1
LGE Property
LGE Internal Use Only
C616
2.4p
VRF_1V5
C628
100n
C627 47n
R603 820
TSX-3225
3
HOT2
2
GND1
26MHz