Pioneer VSX-1017AV-K Service Manual page 41

5
Troubleshooting in the MCACC mode
• When the MCACC mode is turned on (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
of COAX Jack
securely tighten
?
Yes
To Step 1
Step 1: MUTE pin
IC801 (Pin 54)
Is the
voltage of output
signal 0 V
?
Yes
To Step 2
Step 2: BtoB connector
CN901, CN701, CN951
Are the
connectors securely
inserted?
Yes
To Step 3
Step 3: Regulator IC
IC901 (Pin 4)
Is the
voltage of around
5 V to 5.3 V
input?
Yes
Part shape and Pin arrangement
of IC901 and IC902
5
6
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.
VSX-1017AV-K
6
7
IC901 (Pin 5)
(to chassis)
Is the
No
voltage of 3.3 V
Replace IC901.
output?
Yes
IC902 (Pin 5)
(to chassis)
Is the
No
voltage of 1.25 V Replace IC902.
output?
Yes
To Step 4
Step 4: 3 V to 5 V conversion
IC952 (Pin 18)
Do
No
convert 3 V into
Replace IC952.
5 V for pin 2
input?
Yes
IC952 (Pin 17)
Do
No
convert 3 V into
Replace IC952.
5 V for pin 3
input?
Yes
IC952 (Pin 16)
Do
No
convert 3 V into
Replace IC952.
5 V for pin 4
input?
Yes
IC952 (Pin 15)
Do
No
convert 3 V into
Replace IC952.
5 V for pin 5
input?
Yes
A
7
8
A
B
C
D
E
F
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