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4. TROUBLE SHOOTING
(2) Checking FEM & Mobile SW
TEST POINT
X500.4
(VCC)
X500
CIRCUIT
C542
NA
Waveform
X500.3
(OUT)
2V75_VVCXO
R520
3
100
4
C544
2.2u
Graph 1(a)
Checking Flow
26 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
X500
1
OUT
VCONT
2
VCC
GND
26MHz
C543
1000p
Graph 1(b)
- 38 -
VCTCXO Circuit is OK
VCTCXO Circuit is OK
Yes
See next Page to check
See next Page to check
Mobile SW
Mobile SW
No
No
Yes
Changing X500
No
R521
AFC
15K
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