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4. TROUBLE SHOOTING
(2) Checking VCTCXO Circuit
TEST POINT
X500.4
(VCC)
X500
Figure 7
CIRCUIT
R520
100
C542
NA
Waveform
Graph 4(a)
Checking Flow
Check Pin 3.
Refer to Graph 4(b)
Check Pin 4.
Refer to Graph 4(a)
X500.3
(OUT)
2V75_VVCXO
3
OUT
VCONT
4
VCC
26MHz
C544
2.2u
- 46 -
Yes
26 MHzO.K?
No
No
Yes
2.75V OK?
No
Check U101
X500
1
R521
2
15K
GND
C543
1000p
Graph 4(b)
VCTCXO Circuit is OK
VCTCXO Circuit is OK
See next Page to check
See next Page to check
Mobile SW
Mobile SW
Changing X500
AFC
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