- 97 -
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics
97/136
LGE Property
4.13.5. Checking PAM Control Signals
Checking Points
Figure 25. Transceiver Output
Table 4. PAM Mode Operation
HIGH
Control Amp bias
HIGH
8PSK
HIGH
Ramp Burst Control
LOW
GMSK
TXON_PA
PA_LEVEL
MODE
MODE
Figure 24. PAM Control Signals Circuit
TP1(PA LEVEL)
TP2(TXON PA)
TP3(PA_MODE
)
TP3(PA_MODE)
TP2(TXON_PA)
TP1(PA_LEVEL)
GS290 Operational Description Revision B
LG Electronics
97/136
LGE Property
4.13.5. Checking PAM Control Signals
Checking Points
Figure 25. Transceiver Output
Table 4. PAM Mode Operation
HIGH
Control Amp bias
HIGH
8PSK
HIGH
Ramp Burst Control
LOW
GMSK
TXON_PA
PA_LEVEL
MODE
MODE
Figure 24. PAM Control Signals Circuit
TP1(PA LEVEL)
TP2(TXON PA)
TP3(PA_MODE
)
TP3(PA_MODE)
TP2(TXON_PA)
TP1(PA_LEVEL)
GS290 Operational Description Revision B
LG Electronics
97/136
LGE Property
4.13.5. Checking PAM Control Signals
Checking Points
Figure 25. Transceiver Output
Table 4. PAM Mode Operation
HIGH
Control Amp bias
HIGH
8PSK
HIGH
Ramp Burst Control
LOW
GMSK
TXON_PA
PA_LEVEL
MODE
MODE
Figure 24. PAM Control Signals Circuit
TP1(PA LEVEL)
TP2(TXON PA)
TP3(PA_MODE
)
TP3(PA_MODE)
TP2(TXON_PA)
TP1(PA_LEVEL)
1K
R505
SKY77344
U501
1
2
11
10
12
9
13
8
14
7
15
6
16
5
17
4
18
3
19
2
20
1
BS
MODE
ENABLE
VDET
VRAMP
VBATT2
DCS_PCS_IN
VBATT1
GSM_IN
GND9
GND1
DCS_PCS_OUT
GND2
GND8
GND3
GSM_OUT
GND4
GND7
GND5
GND6
D
N
G
P
VBAT
PA_LEVEL
PA_MODE
PA_BAND
TXON_PA
LBAND_PAM_IN
HBAND_PAM_IN
TP(PA_MODE)
TP2(TXON_PA)
TP1(PA_LEVEL)