Pioneer VSX-AX4AVi-S Service Manual page 198

1
Step 7: 1st DSP
A
k
RESET
CN351 (Pin 20)
No
Is the logic
of RST_1 "H"
?
Yes
m
R122
No
Is the logic
B
of RST_1 "H"
?
Yes
Is the logic
of RST_1 maintained
at "H"? (Does it fall to become
"L" periodically?)
Yes
n
R102 REQ_1
C
Does the logic
No
become "H" for a moment
when the input stream
is changed?
Yes
o
CN351 (Pin 21)
Does the logic
become "H" for a moment
when the input stream
D
is changed?
Yes
p
SPIDS_1
CN351 (Pin 17)
Does the logic
become "L" for a moment
when the input stream
is changed?
Yes
q
R123
E
Does the logic
become "L" for a moment
when the input stream
is changed?
F
198
1
2
Check the output from the
DIGITAL MOTHER Assy.
Check the parts and patterns
in the path.
It is likely a boot error.
No
(It is very difficult to diagnose
which peripheral part of the
DSP is in failure.)
The 1st DSP is in failure.
Replace it.
No
Check the parts and patterns
in the path.
No
Check the output from the
DIGITAL MOTHER Assy.
No
Check the parts and patterns
in the path.
VSX-AX4AVi-S
2
3
For the following diagnosis, a digital
oscilloscope must be used.
r
SPICLK
CN351 (Pin 16)
Is the clock
No
signal output while the Check the output from the
voltage at SPIDS_1 DIGITAL MOTHER Assy.
is "L"?
Yes
s
R124
Is the clock
No
Check the parts and patterns
signal output while the
in the path.
voltage at SPIDS_1
is "L"?
Yes
t
MOSI
CN351 (Pin 19)
Is the clock
No
Check the output from the
signal output while the
DIGITAL MOTHER Assy.
voltage at SPIDS_1
is "L"?
Yes
u
R126
Is the clock
No
Check the parts and patterns
signal output while the
voltage at SPIDS_1 in the path.
is "L"?
Yes
v
MISO
R125
Is the clock
No
The 1st DSP is in failure.
signal output while the
Replace it.
voltage at SPIDS_1
is "L"?
Yes
w
CN351 (Pin 18)
Is the clock
No
Check the parts and patterns
signal output while the
voltage at SPIDS_1 in the path.
is "L"?
Yes
It is very difficult to diagnose
which part is in failure.
3
4
4