LG GD510 Service Manual page 88

GD510 Operational Description
5.13.5. Checking PAM Control Signals
GSM850_900_IN
TP2(TXON PA)
MODE_SELECT
DCS_PCS_IN
TP2(TXON PA)
TP1(PA LEVEL)
TP3(PA MODE)
Table 4. PAM Mode Operation
LG Electronics
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Only for training and service purposes
VBAT
TP2(TXON PA)
7
TX_EN
6
VRAMP
5
VBATT
4
BS
3
2
1
C630
C631 C601 C621 C647
1u 33u 27p DNI
39p
Figure 24. PAM Control Signals
Checking Points
Figure 25. Transceiver Output
C637
4.7n
R607 10K
R609 1
1
R606
C640 100p
C633
C639 C646 C638 C626
47p 39p 39p DNI
100p
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5. Trouble shooting
Revision A
TP1(PA LEVEL)
LBAND_PAM_IN
TXON_PA
PA_LEVEL
TP3(PA MODE)
PA_BAND
PA_MODE
TP1(PA LEVEL)
HBAND_PAM_IN
TP3(PA_MODE)
LGE Property
LGE Internal Use Only