General Information; Diagnosis; Dsp Troubleshooting - Pioneer VSX-917V-K Service Manual

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7. GENERAL INFORMATION

7.1 DIAGNOSIS

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
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
F
100
1
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.
Part shape and Pin arrangement
of IC901 and IC902
2
3
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
Step 4: 3 V to 5 V conversion
IC952 (Pin 18)
Do
convert 3 V into
5 V for pin 2
input?
Yes
IC952 (Pin 17)
Do
convert 3 V into
5 V for pin 3
input?
Yes
IC952 (Pin 16)
Do
convert 3 V into
5 V for pin 4
input?
Yes
IC952 (Pin 15)
Do
convert 3 V into
5 V for pin 5
input?
Yes
A
VSX-917V-K
3
4
(to chassis)
No
Replace IC901.
(to chassis)
No
Replace IC902.
No
Replace IC952.
No
Replace IC952.
No
Replace IC952.
No
Replace IC952.
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