Checking Vco Block - LG U310 Service Manual

4. TROUBLE SHOOTING

4.6.1 Checking VCO Block

TP6
TP5
Test Point (TXVCO Level)
R1008
24
R1012
200
R1013
150
R1015
R1018
51
150
R1020
R1022
24
200
TP5
X1000
MQW6V0C869M
5
OUT1 VC
1
OUT2
SW1
3
VB SW2
TP6
Schematic of RF TXVCO
TP1
TP1 TP4
R1009
C1033 C1034
82
120p
1000p
9
10
8
C1050 C1043
33p 10u
C1052
C1051
15p
0.1u
- 88 -
C1035
22n
VREG_RFTX_2.85V
(PPS)
(2012)
C1029
R1014
47 10u
FB1000
VREG_RFTX_2.85V
R1016 100ohm
GSM_TX_VCO_1_EN_N
R1019 100ohm
GSM_TX_VCO_0_EN_N
C1053
15p
TP3
TP2
TP2
TP3
TP4
C1038
0.1u
C1039
100p