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(2) Checking VCTCXO Circuit
Test Points
X500
X500.3
Figure 4-3
Circuit Diagram
C530
100p
Waveform
Graph 4-1(a)
Check Pin 3.
Refer to Graph 4-1(b)
Check Pin 4.
X500.4
Refer to Graph 4-1(a)
2V75_VVCXO
R510
3
OUT
100
4
VCC
C533
2.2u
4. TROUBLE SHOOTING
Checking Flow
26 MHz OK?
No
No
2.7V OK?
No
Check U101, PMIC
X500
1
VCONT
2
GND
C531
0.1u
26MHz
Graph 4-1(b)
- 55 -
VCTCXO Circuit is OK
Yes
See next Page to check
ANT SW & Mobile SW
Yes
Change X500
R511
AFC
10K
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