LG MG180C Service Manual page 71

4. TROUBLE SHOOTING
4.14.2 Checking VCTCXO Circuit (Rx pass continued)
PIN2
PIN3
Check P in 3 of X 501
Yes
26MHz ?
No
Yes
Pin 4 2.85V ?
No
Check U502
PIN1
PIN4
- 70 -
VCTCXO circuit is OK
See next page to check
PLL circuits
Repl ace X501
X500
R515
1
AFC VCONT
12K
2
GND
C532
1000p
Pin4
RF2.85V
26MHz
3
OUT TCXO_OUT
C530
4
1000p
VCC
C531
1uF
Pin3