Pioneer VSX-84TXSi Service Manual page 245

5
Step 8: 2nd DSP
x
RESET
CN352 (Pin 3)
No
Is the logic Check the output from the
of RST_2 "H"
DIGITAL MOTHER Assy.
?
Yes
T
IC201 (Pin 47)
No
Is the logic
Check the parts and patterns
of RST_2 "H"
in the path.
?
Yes
Is the logic
of RST_2 maintained
No
at "H"? (Does it fall to become
"L" periodically?)
Yes
y
CN352 (Pin 2) SS_2
Does the logic
No
Check the output from the
of RST_2 periodically
DIGITAL MOTHER Assy.
become "H" or
"L"?
Yes
T
IC201 (Pin 37)
Does the logic
No
Check the parts and patterns
of RST_2 periodically
in the path.
become "H" or
"L"?
Yes
r
SPICLK
CN351 (Pin 16)
Is the clock
No
Check the output from the
signal output while the
DIGITAL MOTHER Assy.
voltage at SS_2
is "L"?
Yes
T
IC201 (Pin 36)
Is the clock
No
Check the parts and patterns
signal output while the
in the path.
voltage at SS_2
is "L"?
5
6
The 2nd DSP or the commu-
nication path is in failure.
6
7
t
MOSI
CN351 (Pin 19)
Is the clock
signal output while the
voltage at SS_2
is "L"?
Yes
T
IC201 (Pin 34)
Is the clock
signal output while the
voltage at SS_2
is "L"?
Yes
T
IC201 (Pin 35) MISO
Is the clock
signal output while the
voltage at SS_2
is "L"?
Yes
w
CN351 (Pin 18)
Is the clock
signal output while the
voltage at SS_2
is "L"?
Yes
It is very difficult to diagnose
which part is in failure.
VSX-74TXVi
7
8
For the following diagnosis, a digital
oscilloscope must be used.
No
Check the output from the
DIGITAL MOTHER Assy.
No
Check the parts and patterns
in the path.
No
The 2nd DSP is in failure.
Replace it.
No
Check the parts and patterns
in the path.
8
A
B
C
D
E
F
199