LG GX500 - Page 102

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4. TROUBLE SHOOTING
GX500 Operational Description Revision A
LG Electronics 103/143 LGE Property
4.13.4 Checking Transceiver Output Signals
S
IM1 Circuit
SIM2 Circuit
SIM1
SIM2
TP2(LBNAD_PAM_I
TP1(HBNAD_PAM_
TP2(LBNAD_PAM_I
Table 4-3. Transceiver Out
p
ut O
p
eration
Ramp Burst Control8PS
K
Fixed GMS
K
Transceiver OutputMODE
Figure 4-49. Transceiver Output Circuit
Figure 4-50. Transceiver Output
1u
C414
100P
C415
R403
10K
47P
C420
100P
C429
27P
C434
100P
R404
C437
33u
OK
TQM7M5005H
U402
OK
15 7
8 6
11
14 5
9 4
13 3
10 2
12 1
DCS_PCS_IN
DCS_PCS_OUT
MODE_SELECTGSM850_900_OUT
BSBY_CAP1
VBATTBY_CAP2
VRAMPGND1
GND2
TX_ENGND3
GSM850_900_INPGND
C441
100P
R407
100P
TXON_PA
S1_PA_BAND
PA_MODE
PA_LEVEL
LBAND_PAM_IN
HBAND_PAM_IN
R601
100P
TQM7M5005H
U602
15 7
8 6
11
14 5
9 4
13 3
10 2
12 1
DCS_PCS_IN
DCS_PCS_OUT
MODE_SELECTGSM850_900_OUT
BSBY_CAP1
VBATTBY_CAP2
VRAMPGND1
GND2
TX_ENGND3
GSM850_900_INPGND
C620
100P
10K
R605
C622
27P
C623
100P
C631
100P
8
0
6
L
P
0
0
1
1u
C613
47P
C639
C640
33u
TX_RAMP
PA_MODE_2
TXLB
PA_EN
S2_PA_BAND
SIM2 Circult
TP2(LBNAD_PAM_IN)
TP1(HBNAD_PAM_IN)
TP2(LBNAD_PAM_IN)
TP1(HBNAD_PAM_IN)
SIM1 Circult