LG CG225 Service Manual page 78
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Also See for CG225:
- User manual (192 pages) ,
- Guía del usuario (100 pages) ,
- Quick start manual (9 pages)
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4.16.2 Checking VCTCXO Circuit (Rx pass continued)
PIN3
PIN4
PIN1
Check P in 3 of X 501
26MHz ?
No
Pin 4 2.85V ?
No
Check U5 03
AFC
PIN2
4. TROUBLE SHOOTING
VCTCXO circuit is OK
Yes
See next page to check
PLL circuits
Yes
Repl ace X501
X501
26MHz
R512
1
VCONT
OUT
12K
2
GND
VCC
C536
1000p
Pin4
- 77 -
RF2.85V
3
C528
1000p
TCXO_OUT
4
C530
1u
Pin3
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Troubleshooting
