VSX-74TXVi
200
1
2
3
4
1
2
3
4
C
D
F
A
B
E
Step 8: 2nd DSP
Check the output from the
DIGITAL MOTHER Assy.
Check the output from the
DIGITAL MOTHER Assy.
The 2nd DSP or the commu-
nication path is in failure.
CN352 (Pin 3)
RESET
SS_2
SPICLK
Is the logic
of RST_2 "H"
?
Is the logic
of RST_2 "H"
?
No
Yes
x
Check the parts and patterns
in the path.
IC201 (Pin 47)
No
Yes
T
CN352 (Pin 2)
No
y
IC201 (Pin 37)
T
No
Yes
Yes
Does the logic
of RST_2 periodically
become "H" or
"L"?
Check the parts and patterns
in the path.
No
Does the logic
of RST_2 periodically
become "H" or
"L"?
IC201 (Pin 36)
T
Yes
Check the parts and patterns
in the path.
No
CN351 (Pin 16)
r
Yes
Check the output from the
DIGITAL MOTHER Assy.
No
Is the clock
signal output while the
voltage at SS_2
is "L"?
Is the clock
signal output while the
voltage at SS_2
is "L"?
Is the clock
signal output while the
voltage at SS_2
is "L"?
Is the clock
signal output while the
voltage at SS_2
is "L"?
Is the clock
signal output while the
voltage at SS_2
is "L"?
Is the clock
signal output while the
voltage at SS_2
is "L"?
IC201 (Pin 34)
T
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
IC201 (Pin 35)
MISO
T
It is very difficult to diagnose
which part is in failure.
For the following diagnosis, a digital
oscilloscope must be used.
Is the logic
of RST_2 maintained
at "H"? (Does it fall to become
"L" periodically?)
The 2nd DSP is in failure.
Replace it.
