Pioneer SC-LX82 - Page 38

38
SC-LX82
1
2 3 4
A
B
C
D
E
F
1
2 3 4
Step 3: EXTAL Clock
Check the output of pin 4 of IC2601
(Port Expander) on the path.
X2501 (Pin 1)
24ON
X2501 (Pin 3)
Is the logic
gate "H"?
No
Ye s
S
T
Does the
crystal oscillate
at 24.576 MHz
?
No
Ye s
Check the path, or replace IC2502.
Replace X2501.
Check the path.
IC2502 (Pins 3,8)
BUFFER
No
Ye s
U
IC2301 (Pin 80)
1stDSP EXTAL
No
Ye s
V
To Step 4
Is there
a clock output
(24.576 MHz)
?
Is there
a clock input
(24.576 MHz)
?
Check the path.
IC2401 (Pin 45)
2ndDSP EXTAL
No
Ye s
W
Is there
a clock input
(24.576 MHz)
?
Step 4: Audio Signal
Check the signal path.
Check the signal path.
Check the signal path.
Check the signal path.
Check the signal path.
IC2301 (Pins 89,134)
MCLK
BCK
LRCK
No
Ye s
X
IC2401 (Pin 73)
No
Ye s
Y
IC2301 (Pin 94)
No
a
IC2301 (Pin 97)
b
IC2301 (Pin 93)
DATA
No
Ye s
Ye s
No
Ye s
Z
To Step 5
Are there
MCLK inputs to
1st DSP
?
Is there a
MCLK input to
2nd DSP
?
Is there a
BCK input to
1st DSP
?
Is there a
LRCK input to
1st DSP
?
Is there a
DATA input to
1st DSP
?