Pioneer SX-LX70SW Service Manual page 39

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QQ
3 7 63 1515 0
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IC751 (Pin 12)
Is there
a audio data
(with Cch source)?
Yes
IC751 (Pin 28)
Is there
a audio data
(with Sch source)?
Yes
IC3101 (Pin 30)
Is there
a audio data
(with Sch source)?
Yes
IC751 (Pin 27)
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L 13942296513
Is there
a audio data
(with Cch source)?
Yes
I3101 (Pin 29)
Is there
a audio data
(with Cch source)?
Yes
to CIRCUIT DESCRIPTION OF DIGITAL
AMP. SECTION
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5
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Check the following points when the source is
Multi ch.
Is there
No
No
abnormality at the
parts and patterns
in the path?
Replace IC701
or IC751.
LSSD
Is there
No
No
abnormality at the
parts and patterns
in the path?
Replace IC751
or IC3101.
Is there
No
No
abnormality at the
parts and patterns
in the path?
Replace IC751
or IC3101.
LSCD
Is there
No
No
abnormality at the
parts and patterns
in the path?
Replace IC751
or IC3101.
Is there
No
No
abnormality at the
parts and patterns
in the path?
Replace IC751
or IC3101.
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6
8
Step 8: 1st DSP
IC101 B10 (R104) DSP1RST(20D) (DSP UCOM)
Is the voltage
3.3 V?
Yes
Is the
voltage of DSP1RST
maintained in 3.3V?
(Does it fall to become
0V periodically?)
IC101 F2 (R109)
Does the
voltage become
3.3 V for a moment
when the input stream
is changed?
Yes
IC101 A11 (R136)
Q Q
3 6 7 1 3
Does the
voltage become
0 V for a moment
when the input stream
is changed?
Yes
IC101 B9 (R103)
Is the clock
signal output while the
voltage is 0 V?
Yes
IC101 A9 (R132)
Is the clock
signal output while the
voltage is 0 V?
Yes
K
u163
.
SX-LX70SW
6
7
2 9 9 4 2 8
No
Check the parts and patterns
in the path.
It is likely a Boot Error.
No
(It is very difficult to diagnose which
peripheral part of the DSP is in failure.)
IRQ1 (89D) (DSP UCOM)
No
The 1st DSP or the communication
path is in failure.
DSP1CS (90D) (DSP UCOM)
1 5 0 5 8 2 9 9 4
No
Check the parts and patterns
in the path.
For the following diagnosis, a digital
oscilloscope must be used.
DSP CCLK (100D) (DSP UCOM)
No
Check the parts and patterns
in the path.
DSP CDOUT (99D) (DSP UCOM)
No
Check the parts and patterns
in the path.
m
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
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