VSX-LX50
47
5
6
7
8
5
6
7
8
C
D
F
A
B
E
For the following diagnosis, a digital
oscilloscope must be used.
For the following diagnosis, a digital
oscilloscope must be used.
For the following diagnosis, a digital
oscilloscope must be used.
P
Is the
voltage of D2RST
maintained in 3.3V?
(Does it fall to become
0V periodically?)
Yes
Step 9: 2nd DSP
CN951 (Pin 11)
IC201 (Pin 47)
D2RST
Is the voltage
3.3 V?
No
Check the parts and patterns
in the path.
The 2nd DSP or the communication
path is in failure.
Check the path to the microcomputer.
Yes
Yes
Is the voltage
3.3 V?
No
No
CN951 (Pin 10)
D2CS
DSDO3
Check the path to the
microcomputer.
No
Yes
The 1st DSP or the communication
path is in failure.
IC101 A10 (R134)
No
Is the clock
signal output while the
voltage at DICS3
is 0 V?
Yes
Yes
Check the parts and patterns
in the path.
CN951 (Pin 13)
No
Is the clock
signal output while the
voltage at DICS3
is 0 V?
DSCLK3
Check the path to the
microcomputer.
CN951 (Pin 12)
No
Is the clock
signal output while the
voltage at D2CS
is 0 V?
Yes
Yes
Check the parts and patterns
in the path.
IC201 (Pin 36)
No
Is the clock
signal output while the
voltage at D2CS
is 0 V?
DSDI3
Check the path to the
microcomputer.
CN951 (Pin 14)
No
Is the clock
signal output while the
voltage at D2CS
is 0 V?
Yes
Yes
Check the parts and patterns
in the path.
IC201 (Pin 34)
No
Is the clock
signal output while the
voltage at D2CS
is 0 V?
DSDO3
The 2nd DSP or the communication
path is in failure.
IC201 (Pin 35)
No
Is the clock
signal output while the
voltage at D2CS
is 0 V?
Yes
It is very difficult to diagnose
which part is in failure.
Does the logic
of D2CS periodically
become 3.3 V or
0 V?
IC201 (Pin 37)
Check the parts and patterns
in the path.
No
Yes
Does the logic
of D2CS periodically
become 3.3 V or
0 V?
Yes
Check the parts and patterns
in the path.
CN951 (Pin 13)
No
Is the clock
signal output while the
voltage at D2CS
is 0 V?
It is very difficult to diagnose
which part is in failure.