4. TROUBLE SHOOTING
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LGE Internal Use Only
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Only for training and service purposes
(2) Checking Mobile SW &TX Module
4. TROUBLE SHOOTING
RF_TX_EN
RF_ANT_SEL[0]
RF_ANT_SEL[1]
RF_TX_RAMP
TP2
TP3
TP1
U101
TP4
SW101
Figure 4.2.4
EGSM Rx
hu{ zlsX
RF_ANT_SEL[1]
RF_TX_RAMP
RF_ANT_SEL[0]
RF_TX_EN
TP4
hu{zlsX
{lu
hu{zlsW
TP2
TP3
TP1
TP4
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
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(2) Checking Mobile SW &TX Module
n8.
1
93
1
C
L112
5.6n
R102
12
L106
1.8n
1.8n
L110
C109
2.2n
70
1
L
n8.
6
U101
SKY77550-21
9
2
3
2
4
2
5
2
6
2
7
2
8
2
15
16
17
18
19
20
21
22
8
7
6
5
4
3
2
1
4
1
3
1
2
1
1
1
0
1
9
N
I
_
B
L
_
x
T
N
I
_
B
H
_
x
T
N
E
_
W
S
V
S
B
1
D
V
S
R
2
D
V
S
R
GND1
GND2
VBATT1
VBATT2
GND3
GND4
GND5
GND6
GND7
Rx2
RSVD3
Rx1
RSVD
TxEN
VRAMP
GND8
9
D
N
G
0
1
D
N
G
T
N
A
1
1
D
N
G
2
1
D
N
G
3
1
D
N
G
D
N
G
P
L105
0.5p
0
L101
FL101
10
5
8
3
7
2
6
4
9
1
U_P_1960/
B_P_1960/1842_5MHz_2
U_P_1842_5/
B_P_942_5/881_5MHz_1
GND1
B_P_942_5/881_5MHz_2
GND2
B_P_1960/1842_5MHz_1
GND3
GND4
942_5MHz
881_5MHz
C111
DNI
L111
10n
10n
L114
L109
0.75p
0.5p
C114
40
1
L
n8.
1
SW101
4
3
2
1
ANT
COMMON
G3
G4
DNI
L138
DNI
L139
C116
39p
39p
C115
39p
C117
C108
33u
DNI
L108
C107
15p
C102
33p
C104
DNI
C101
33p
C103
DNI
VBAT
1K
R104
C106
10n
C105
39p
L103
DNI
L113
DNI
L102
DNI
RF_HB_TX
RF_LB_TX
RF_HB_RXN
RF_LB_RXP
RF_TX_EN
RF_ANT_SEL[0]
RF_ANT_SEL[1]
RF_TX_RAMP
ANT_FEED
RF_HB_RXP
RF_LB_RXN
(50V,J,NP0)
GSM850 / DCS
(10V,2012)
EGSM / PCS
(16V,K,X7R)
RF_ANT_SEL[0]
RF_ANT_SEL[1]
RF_TX_RAMP
RF_TX_EN
TP1
TP4
TP2
TP3
U101
TP4
RF_TX_RAMP
RF_ANT_SEL[1]
RF_ANT_SEL[0]
RF_TX_EN
TP2
TP3
Figure 4.2.4
SW101
TP1