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4. TROUBLESHOOTING
(1) Checking VCTCXO Circuit
TEST POINT
R404
CIRCUIT
R403
AFC
10K
Waveform
Graph 4-1(a)
C408
X400
1
VCONT
OUT
2
GND
VCC
C407
13MHz
1000p
- 64 -
Checking Flow
13 MHzO.K?
Check Pin 3.
Refer to Graph 4 -1(b)
2.75V OK?
Check Pin 4.
Refer to Graph 4 -1(a)
Check U101
2V75_VVCXO
C405
1000p
100
3
R404
4
C408
1u
Graph 4-1(b)
VCTCXO Circuit is OK
VCTCXO Circuit is OK
Yes
See next Page to check
See next Page to check
ANT SW & Mobile SW
ANT SW & Mobile SW
No
No
Yes
Changing X601
No
13MHz
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