LG M6100 Service Manual - Page 66
Checking Ant SW & Mobile SW
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(3) Checking Ant SW & Mobile SW TEST POINT 4. TROUBLE SHOOTING ANT 13 CIRCUIT ANT_SW3 ANT_SW2 ANT_SW1 C505 27p C506 27p C507 27p FL501 VC3 12 VC2 9 VC1 11 GSM1900_RX GSM1800_RX 6 4 GSM900_RX 2 GND7 16 GND6 15 GND5 14 GND4 GSM18001900_TX 7 GND3 GSM900_TX 8 5 10 GND2 3 1 GND1 LMSP54LA-445TEMP DCS_PCS_TX GSM900_TX Waveform VC1 LOW VC2 LOW VC3 HIGH Graph 4-7(a) FEM Control EGSM VC1 LOW VC2 HIGH VC3 LOW Graph 4-7(b) FEM Control DCS & PCS - 67 -
4. TROUBLE SHOOTING
- 67 -
(3) Checking Ant SW & Mobile SW
VC1 LOW
VC2 LOW
VC3 HIGH
VC1 LOW
VC2 HIGH
VC3 LOW
Graph 4-7(b)
FEM Control DCS & PCS
Graph 4-7(a)
FEM Control EGSM
TEST POINT
CIRCUIT
Waveform
8
GSM1800_RX
4
GSM1900_RX
6
GSM900_RX
2
GSM900_TX
10
VC1
11
9
VC2
12
VC3
13
ANT
1
GND1
GND2
3
5
GND3
7
GND4
GND5
14
15
GND6
GND7
16
GSM18001900_TX
27p
LMSP54LA-445TEMP
FL501
C505
C507
27p
C506
27p
ANT_SW3
ANT_SW2
ANT_SW1
GSM900_TX
DCS_PCS_TX