Pioneer VSX-918V-S Service Manual page 32

1
QQ
Troubleshooting in the MCACC mode
3 7 63 1515 0
• 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
TE
L 13942296513
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
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F
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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.
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VSX-918V-K
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http://www.xiaoyu163.com
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8
Step 3: Regulator IC
IC1 (Pin 4)
Is the
voltage of around
5 V to 5.3 V
input?
Yes
IC1 (Pin 5)
Is the
voltage of 3.3 V
output?
Yes
IC2 (Pin 5)
Is the
voltage of 1.25 V
output?
Yes
Q Q
3 6 7 1 3
To Step 4
Step 4: 3 V to 5 V conversion
IC351
Do
convert 3 V into
5 V for input?
Yes
IC341
Do
convert 3 V into
5 V for input?
Yes
To Step 5
u163
.
3
4
2 9 9 4 2 8
(to chassis)
No
Check the IC1 and
REGULATOR Assy.
(to chassis)
No
Replace IC1.
(to chassis)
No
Replace IC2.
1 5 0 5 8 2 9 9 4
Part shape and Pin arrangement
of IC1 and IC2
No
Replace IC351.
No
Replace IC341.
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co
4
9 9
2 8 9 9