Dsp Trouble Shooting - Pioneer VSX-C402-S Service Manual

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7.1.6 DSP Trouble shooting

• 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.
A
Step 1
IC8501-pin 21
Is output
No
signal "L"?
Yes
B
Is the
screw is fastened
No
at KN8102
(earth point)?
Yes
CN8003
Is connector
No
inserted tightly
?
C
Yes
CN8007
Is connector
No
inserted tightly
?
Yes
D
Is connector
No
inserted tightly
?
Yes
End
E
F
90
1
2
Replace IC8501.
Tighten screws.
Insert it tightly.
Insert it tightly.
Insert it tightly.
VSX-C402-S
2
3
Step 2
IC8901
Is 5V
No
inputting ?
Yes
Is 3.3V
No
outputting ?
Yes
IC8902
Yes
Is 1.8V
No
outputting ?
Yes
End
Step 3
IC8702
Pin 3
Do perform
No
3V→5V conversion
for pin 17 ?
Yes
Pin 5
Do perform
No
3V→5V conversion
for pin 15 ?
Yes
Pin 7
Do perform
No
3V→5V conversion
for pin 13 ?
Yes
A
3
4
Check CN8003 and
other assemblies.
Replace IC8901.
Replace IC8902.
Replace IC8702.
Replace IC8702.
Replace IC8702.
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