General Information; Diagnosis; Dsp Troubleshooting - Pioneer VSX-817-K Service Manual

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7. GENERAL INFORMATION

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7.1 DIAGNOSIS

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7.1.1 DSP TROUBLESHOOTING

A
Troubleshooting for all destination
• When a sound is not out in the multi-CH signal playback mode or surround mode with the digital signal input.
(SurroundBack is not output by setting.)
• Suppose CR to be poor contact and that is not damaged.
• This shows failure analysis of DSP Assy.
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
B
of COAX Jack
securely tighten
?
Yes
To Step 1
Step 1: MUTE pin
IC801 (Pin 54)
C
Is the
voltage of output
signal 0 V
?
Yes
TE
L 13942296513
To Step 2
Step 2: BtoB connector
CN901, CN701, CN951
D
Are the
connectors securely
inserted?
Yes
To Step 3
Step 3: Regulator IC
IC901 (Pin 4)
E
Is the
voltage of around
5 V to 5.3 V
input?
Yes
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100
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2
No
Tighten screws securely.
MUTE
No
Replace IC801.
No
Turn the power off and
insert the connectors
securely.
(to chassis)
No
Check the CN901 and
Regulator assy.
x ao
y
. i
Part shape and Pin arrangement
of IC901 and IC902
VSX-917V-K
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8
IC901 (Pin 5)
Is the
voltage of 3.3 V
output?
Yes
IC902 (Pin 5)
Is the
voltage of 1.25 V
output?
Yes
To Step 4
Q Q
Step 4: 3 V to 5 V conversion
3 6 7 1 3
IC952 (Pin 18)
Do
No
convert 3 V into
5 V for pin 2
input?
Yes
IC952 (Pin 17)
Do
No
convert 3 V into
5 V for pin 3
input?
Yes
IC952 (Pin 16)
Do
No
convert 3 V into
5 V for pin 4
input?
Yes
IC952 (Pin 15)
Do
u163
No
convert 3 V into
5 V for pin 5
input?
.
Yes
A
3
4
2 9 9 4 2 8
(to chassis)
No
Replace IC901.
(to chassis)
No
Replace IC902.
1 5 0 5 8 2 9 9 4
Replace IC952.
Replace IC952.
Replace IC952.
m
co
Replace IC952.
4
9 9
2 8 9 9