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4. Trouble Shooting
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4.19.3 Checking VCTCXO Circuit
Figure 3. VCTCXO
Figure 4. VCTCXO Cicuit
Figure5. VCTCXO Waveform
Pin : 2.7V
Pin 3: 26MHz
X501
Is the waveform
of Pin3 similar to
Fig.5?
Is the waveform
of Pin4 similar to
Fig.6?
Replace X501
Checking U203
(PMIC)
Yes
No
No
Yes
VCTCXO Circuit is OK.
See next page to check
PLL Circuit.
VCONT
1
26MHz
X501
2
GND
3
OUT
VCC
4
0.1u
C529
2V7_VCXO
120p
C530
Pin 4
Pin 3
Checking Flow
VCTCXO Circuit Diagram
Waveform
Summary of Contents for Chocolate KE800
Page 1: ...Service Manual Model KE800 Service Manual KE800 Date January 2007 Issue 1 0 ...
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Page 82: ...6 SW Download 83 KE800 KE800P40 7 V10g 9 Download complete ...
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Page 96: ... 97 8 PCB LAYOUT ...
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