Pioneer VSX-817-K Service Manual page 107

5
QQ
3 7 63 1515 0
Troubleshooting in the MCACC mode (AWX8809 and AWX8810 only)
• 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
To Step 1
Step 1: MUTE pin
IC801 (Pin 54)
voltage of output
signal 0 V
To Step 2
TE
L 13942296513
Step 2: BtoB connector
CN901, CN701, CN951
Are the
connectors securely
inserted?
To Step 3
Step 3: Regulator IC
IC901 (Pin 4)
voltage of around
5 V to 5.3 V
www
.
5
http://www.xiaoyu163.com
No
Tighten screws securely.
?
Yes
MUTE
Is the
No
Replace IC801.
?
Yes
No
Turn the power off and
insert the connectors
securely.
Yes
(to chassis)
Is the
No
Check the CN901 and
Regulator assy.
input?
Yes
x ao
y
Part shape and Pin arrangement
i
of IC901 and IC902
http://www.xiaoyu163.com
6
8
IC901 (Pin 5)
Is the
voltage of 3.3 V
output?
IC902 (Pin 5)
Is the
voltage of 1.25 V
output?
To Step 4
Step 4: 3 V to 5 V conversion
IC952 (Pin 18)
Q Q
3 6 7 1 3
Do
convert 3 V into
5 V for pin 2
input?
IC952 (Pin 17)
Do
convert 3 V into
5 V for pin 3
input?
IC952 (Pin 16)
Do
convert 3 V into
5 V for pin 4
input?
IC952 (Pin 15)
Do
convert 3 V into
5 V for pin 5
input?
u163
.
A
VSX-917V-K
6
7
2 9 9 4 2 8
(to chassis)
No
Replace IC901.
Yes
(to chassis)
No
Replace IC902.
Yes
1 5 0 5 8 2 9 9 4
No
Replace IC952.
Yes
No
Replace IC952.
Yes
No
Replace IC952.
Yes
m
No
Replace IC952.
co
Yes
7
8
9 9
A
B
C
2 8 9 9
D
E
F
107
8