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4. TROUBLESHOOTING
(1) Checking VCTCXO Circuit
TEST POINT
CIRCUIT
Waveform
Check Pin 3.
Refer to Graph 4 -1(b)
Check Pin 4.
Refer to Graph 4 -1(a)
R510
10K
AFC
C529
1000p
Graph 4-2(a)
Checking Flow
26 MHzO.K?
No
2.75V OK?
No
Check U101
2V75_VVCXO
R746
0
26MHz
GND
VCC
2
4
VCONT
OUT
1
3
X500
Graph 4-2(b)
- 54 -
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
Yes
Changing X500
C528
(1608)
2.2u
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