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4. TROUBLESHOOTING
(1) Checking VCTCXO Circuit
TEST POINT
R404
CIRCUIT
AFC
Waveform
C408
X400
R403
1
VCONT
10K
2
GND
C407
13MHz
1000p
Graph 4-1(a)
Checking Flow
13 MHzO.K?
Check Pin 3.
Refer to Graph 4-1(b)
Check Pin 4.
2.75V OK?
Refer to Graph 4-1(a)
Check U101
2V75_VVCXO
C405
1000p
100
3
OUT
R404
4
VCC
C408
1u
Graph 4-1(b)
- 58 -
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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