Pioneer SX-LX70SW Service Manual page 40

1
A
K
IC101 A10 (R134) DSP CDIN (98D) (DSP UCOM)
Is the clock
No
signal output while the
voltage is 0 V?
Yes
B It is very difficult to diagnose
which part is in failure.
Step 9: 2nd DSP
IC201 (Pin 47)
DSP2RST (19D) (DSP UCOM)
C
No
Is the voltage
3.3 V?
Yes
Is the
voltage of D2RST
No
maintained in 3.3V?
(Does it fall to become
0V periodically?)
Yes
D
IC201 (Pin 37)
DSP2SSI (1D) (DSP UCOM)
Does the logic
No
of D2CS periodically
become 3.3 V or
0 V?
Yes
IC201 (Pin 36) DSP2SCK (100D) (DSP UCOM)
E
Is the clock
No
signal output while the
voltage is 0 V?
Yes
F
40
1
2
For the following diagnosis, a digital
oscilloscope must be used.
The 1st DSP or the communication
path is in failure.
Check the parts and patterns
in the path.
The 2nd DSP or the communication
path is in failure.
For the following diagnosis, a digital
oscilloscope must be used.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
2
3
IC201 (Pin 34)
Is the clock
signal output while the
voltage is 0 V?
Yes
IC201 (Pin 35)
Is the clock
signal output while the
voltage is 0 V?
Yes
It is very difficult to diagnose
which part is in failure.
SX-LX70SW
3
4
For the following diagnosis, a digital
oscilloscope must be used.
DSP2MOSI (99D) (DSP UCOM)
No
Check the parts and patterns
in the path.
DSP2MISO (98D) (DSP UCOM)
No
The 2nd DSP or the communication
path is in failure.
4