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4. TROUBLE SHOOTING
Checking VCTCXO Circuit
X601
PIN1
(AFC)
PIN4
(RF_2.85V)
RF2.85V
C654
1000p
3
TCXO
OUT VCONT
4
VCC
C656
2.2u
PIN3
(TCXO)
X601
R617
26MHz
15K
1
APC
2
ONG
C667
1000p
- 80 -
Check Pin 1
No
2.85V?
Yes
No
Pin 1
0.9V?
Yes
No
Pin 3
13MHz?
Yes
VCTCXO Circuit is OK.
Check
Regulato Circuit
Check ABB[U101]
Replace VCTCXO
[X601]
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