104
1
2
4
1
2
4
C
D
F
A
B
E
XV-DV430
IC8501-pin 21
Yes
No
Is output
signal "L"?
Is the
screw is fastened
at KN8102
(earth point)?
Is connector
inserted tightly
?
• When a sound is not out in the surround mode with the digital signal input.
• Suppose C,R parts to be poor contact and that is not damaged.
• This shows failure analysis of DSP Assy.
Step 1
Replace IC8501.
Replace IC8702.
Replace IC8901.
IC8901
Yes
No
Is 5V
inputting ?
Step 2
IC8902
Check CN8003 and
other assemblies.
IC8702
No
Do perform
3V
→
5V conversion
for pin 17 ?
Step 3
Pin 3
Yes
No
Is 3.3V
outputting ?
Replace IC8902.
Yes
End
Yes
Yes
Replace IC8702.
No
Do perform
3V
→
5V conversion
for pin 15 ?
Pin 5
Replace IC8702.
No
Do perform
3V
→
5V conversion
for pin 13 ?
Pin 7
Yes
Yes
No
Is 1.8V
outputting ?
No
Insert it tightly.
KN8102
Yes
Yes
No
CN8003
Is connector
inserted tightly
?
No
Insert it tightly.
CN8007
Yes
Is connector
inserted tightly
?
No
Insert it tightly.
CN8011
Tighten screws.
A
7.1.9 DSP TROUBLE SHOOTING
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