LG GS290 - Page 96

- 97 -
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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 ControlLOW GMS
K
TXON_PA PA_LEVELMODE 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 ControlLOW GMS
K
TXON_PA PA_LEVELMODE 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 ControlLOW GMS
K
TXON_PA PA_LEVELMODE 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)
1KR505
SKY77344
U501
12
11 10
12 9
13 8
14 7
15 6
16 5
17 4
18 3
19 2
20 1
BSMODE
ENABLEVDET
VRAMPVBATT2
DCS_PCS_INVBATT1
GSM_INGND9
GND1DCS_PCS_OUT
GND2GND8
GND3GSM_OUT
GND4GND7
GND5GND6
D
N
GP
VBAT
PA_LEVEL
PA_MODE
PA_BAND
TXON_PA
LBAND_PAM_I
N
HBAND_PAM_IN
TP3(PA_MODE)
TP2(TXON_PA)
TP1(PA_LEVEL)