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(2) Checking VCTCXO Circuit
TEST POINT
CIRCUIT
Waveform
Graph 4-1(a)
Check Pin 3.
Refer to Graph 4-1 (b)
Check Pin 4.
Refer to Graph 4-1 (a)
Check U101, PMIC
2V75_VVCXO
X500
1
3
1
OUT VCONT
2
4
VCC
GNO
C536
13MHz
22u
- 55 -
Checking Flow
Yes
13 MHz O.K?
No
Yes
2.7V OK?
No
R516
AFC
15K
C538
1000p
Graph 4-1(b)
4 . TROUBLE SHOOTING
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
Changing X500
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