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4. TROBULE SHOOTING
4.3.2 Checking VCTCXO Circuit
X400.3 X400.4
2V75_VTCXO
(1608)
Check Pin 3.
13 MHz O.K?
? Refer to Graph 4-8
Check Pin 4.
2.75V OK?
? Refer to Graph 4-9
Check U301, PMIC
X400
3
OUT
CTL
4
VCC
GND
C435
13MHz
2.2u
Graph 4-8
Figure 4-11
VCTCXO Circuit is OK
Yes
See next Page to check
ANT SW & Mobile SW
No
Yes
Changing X400
No
1
C432
2
1000p
- 46 -
R414
AFC
15K
Graph 4-9
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