Pioneer VSX-918V-K Service Manual page 32

1
Troubleshooting in the MCACC mode
• When the MCACC mode is turned on (SurroundBack is not output by setting.)
• Suppose CR to be normal contact and that is not damaged.
A
• This shows failure analysis of DSP Block.
Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws
of COAX Jack
securely tighten
?
Yes
B
To Step 1
Step 1: MUTE pin
IC201 (Pin 54)
Is the
voltage of output
signal 0 V
?
C
Yes
To Step 2
Step 2: BtoB connector and FFC
CN1, CN2
Are the
connectors securely
inserted?
D
Yes
CN3
Is the
FFC securely
inserted?
Yes
To Step 3
E
F
32
1
2
No
Tighten screws securely.
MUTE
No
Replace IC201.
BtoB connector
No
Turn the power off and
insert the connectors
securely.
FFC
No
Turn the power off and
insert the connectors
securely.
VSX-918V-K
2
3
Step 3: Regulator IC
IC1 (Pin 4)
(to chassis)
Is the
No
Check the IC1 and
voltage of around
5 V to 5.3 V REGULATOR Assy.
input?
Yes
IC1 (Pin 5)
(to chassis)
Is the
No
voltage of 3.3 V
Replace IC1.
output?
Yes
IC2 (Pin 5)
(to chassis)
Is the
No
voltage of 1.25 V Replace IC2.
output?
Yes
To Step 4
Part shape and Pin arrangement
of IC1 and IC2
Step 4: 3 V to 5 V conversion
IC351
Do
No
convert 3 V into
Replace IC351.
5 V for input?
Yes
IC341
Do
No
convert 3 V into
Replace IC341.
5 V for input?
Yes
To Step 5
3
4
4