Pioneer SX-LX70SW Service Manual page 36

1
A
G
Check the following points when the source is
Muiti ch.
IC101 P11 (R126(3)) DT1O
Is there
No
a audio data
(with Sch source)?
B Yes
IC201 (Pin 80)
Is there
No
a audio data
(with Sch source)?
Yes
IC101 P12 (R126(2)) DT2O
Is there
No
C
a audio data
(with Cch source)?
Yes
IC201 (Pin 58)
Is there
No
a audio data
(with Cch source)?
Yes
D
IC101 P13 (R126(1)) DT3O
Is there
No
a audio data
(with SBch source)?
Yes
IC201 (Pin 59)
Is there
No
a audio data
E
(with SBch source)?
Yes
To Step 7
F
36
1
2
Is there
No
abnormality at the
parts and patterns
in the path?
Failure in 1st DSP block,
Go to Step 8.
Is there
No
abnormality at the
parts and patterns
in the path?
Replace IC201.
Is there
No
abnormality at the
parts and patterns
in the path?
Failure in 1st DSP block,
Go to Step 8.
Is there
No
abnormality at the
parts and patterns
in the path?
Replace IC201.
Is there
No
abnormality at the
parts and patterns
in the path?
Failure in 1st DSP block,
Go to Step 8.
Is there
No
abnormality at the
parts and patterns
in the path?
Replace IC201.
SX-LX70SW
2
3
Step 7: Audio Clock (from 2nd DSP to the MODU-
LATOR input)
DARST
IC701 (Pin 21)
Is the
No
Check the path to
voltage of reset
the microcomputer.
input 3.3 V?
Yes
IC751 (Pin 21)
Is the
No
Check the path to
voltage of reset
the microcomputer.
input 3.3 V?
Yes
LSSDA, LSSCL
IC701 (Pins 23,24)
(33D) (35D)
Is the
No
control signal visible
abnormality at the
when the delay amount
parts and patterns
is changed?
Yes
IC751 (Pins 23,24)
Is the
No
control signal visible
abnormality at the
when the delay amount
parts and patterns
is changed?
Yes
IC291 (Pin 12) MCLK
Is there
No
abnormality at the
a master clock input
parts and patterns
(24.576 MHz)?
in the input path?
Yes
IC291 (Pin 11) MCK3
Is there
No
abnormality at the
a master clock output
parts and patterns
(24.576 MHz)?
in the output path?
Yes
MCLK
IC291 (Pin 9)
Is there
No
abnormality at the
an operating master
parts and patterns
clock signal
in the input path?
(24.576 MHz)?
Yes
IC291 (Pin 8) MCLK4
Is there
No
abnormality at the
an operating master
parts and patterns
clock signal
in the output path?
(24.576 MHz)?
Yes
H
3
4
No
Replace IC701
or IC751.
No
Replace IC701
or IC751.
Is there
No
in the path?
Replace IC701
or IC751.
Is there
No
in the path?
Replace IC701
or IC751.
Is there
No
Replace IC291.
Is there
No
Replace IC291,
IC701 or IC751.
Is there
No
Replace IC291.
Is there
No
Replace IC291
or IC3101.
4