34
SC-LX81
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Step 5: Audio Signal
The 1st DSP Block is in failure.
Proceed to Step 7.
The 1st DSP Block is in failure.
Proceed to Step 7.
The 1st DSP Block is in failure.
Proceed to Step 7.
IC2701 (Pin 136)
BCK
BCK
LRCK
LRCK
No
Yes
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
IC2801 (Pins 63, 76)
No
Yes
IC2801 (Pins 61, 78)
No
IC2701 (Pin 125)
IC2701 (Pin 135)
DATA
DATA
No
Yes
Yes
IC2801 (Pin 1)
No
No
Yes
Yes
To Step 6
Step 6: Audio Signal
The 2nd DSP Block is in failure.
Proceed to Step 8.
The 2nd DSP Block is in failure.
Proceed to Step 8.
The 2nd DSP Block is in failure.
Proceed to Step 8.
IC2801 (Pin 77)
BCK
BCK
LRCK
LRCK
No
Yes
IC2803 (Pin 11)
IC2801 (Pin 79)
IC2803 (Pin 14)
IC2801 (Pin 7)
IC2803 (Pin 5)
No
Yes
DATA
DATA
No
Yes
No
Yes
No
No
Yes
Yes
Is there
bit clock output
from 1st DSP?
Is there
bit clock output
from 2nd DSP?
Is there
L/R clock output
from 2nd DSP?
Is there
data output
from 2nd DSP?
Is there
data input
to selector?
Is there
bit clock input
to selector?
Is there
L/R clock input
to selector?
Is there
L/R clock output
from 1st DSP?
Is there
data output
from 1st DSP?
Is there
L/R clock input
to 2nd DSP?
Is there
bit clock input
to 2nd DSP?
Is there
data input
to 2nd DSP?
AC
AI
AJ
AK
AL
AM
AN
AD
AE
AF
AG
AH
It is very difficult to diagnose
which part is in failure.