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