LG KG270 Service Manual - Page 51
Test Point, Circuit
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4. TROUBLE SHOOTING TX Trouble TEST POINT SW400 U400 FL400 FL401 CIRCUIT TP400 TP401 TP402 TP403 TP404 TP405 R400 NA R401 0 C400 1p L401 22nH SW400 RF500 R403 0 L400 2.2nH ANT G2 G1 RF X101 U102 VC1 VC2 C417 C418 27p 27p C410 22p FL400 LMSP2PAA-575TEMP 9 1 IN GSM1800_1900TX GSM1800_1900RX 6 3 7 VC_GSM850_900TX VC_GSM1800_1900TX 5 8 GND1 GSM850_900TX 2 4 10 GND2 GND3 GSM850_900RX Mode VC1 VC2 GSM900 TX H(2.7V) L DCS1800 TX L H(2.7V) GSM800 RX L L DCS1800 RX L L - 52 -
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4. TROUBLE SHOOTING
- 52 -
TX Trouble
U400
SW400
U102
FL400
X101
FL401
TEST POINT
TP403
C410
22p
R403
0
C400
1p
TP401
SW400
RF500
ANT
G1
G2
RF
TP404
TP402
C417
27p
2.2nH
L400
C418
27p
TP405
0
R401
R400
NA
TP400
FL400
5
GND1
GND2
8
GND3
10
GSM1800_1900RX
6
1
GSM1800_1900TX
GSM850_900RX
4
2
GSM850_900TX
9
IN
VC_GSM1800_1900TX
7
3
VC_GSM850_900TX
LMSP2PAA-575TEMP
22nH
L401
VC2
VC1
CIRCUIT
Mode
GSM900 TX
DCS1800 TX
GSM800 RX
DCS1800 RX
VC1
H(2.7V)
L
L
L
VC2
L
H(2.7V)
L
L