40
SC-LX82
1
2
3
4
A
B
C
D
E
F
1
2
3
4
The 2nd DSP Block or the
comm
u
nication path is in fail
u
re.
Step 7: 1st DSP
Step 8: 2nd DSP
Check the o
u
tp
u
t of pin 13 of
IC2605 (Port Expander) on the path.
Check the o
u
tp
u
t of pin 24 of
CN2601 on the path.
Check the o
u
tp
u
t of pin 20 of
CN2601 on the path.
It is likely a
b
oot error.
(It is
v
ery diffic
u
lt to diagnose
w
hich peripheral part of the
DSP is in fail
u
re.)
IC2301 (Pin 111)
RESET
DSP1SS0
DSP1SS1
D1D2SCK
Is the logic
of XDSP1RST
"H" ?
No
Yes
o
IC2301 (Pin 117)
No
Check the o
u
tp
u
t of pin 19 of
CN2601 on the path.
No
Check the o
u
tp
u
t of pin 3 of
IC2609 on the path.
No
p
IC2301 (Pin 112)
q
No
Yes
Yes
Yes
Does the logic
b
ecome "L" for a moment
w
hen the inp
u
t stream
is changed?
Does the logic
b
ecome "L" for a moment
w
hen the inp
u
t stream
is changed?
s
Yes
IC2301 (Pin 115)
r
Yes
Yes
No
Is the logic
of XDSP2RST
"H"?
IC2401 (Pin 47)
RESET
u
It is
v
ery diffic
u
lt to diagnose
w
hich part is in fail
u
re.
Is the logic of
XDSP1RST maintained
at "H"? (Does it fall to
b
ecome
"L" periodically?)
No
Is the clock
signal o
u
tp
u
t
w
hile the
v
oltage at DSP1SS0 and
DSP1SS1 are "L"?
D1D2SO
Check the o
u
tp
u
t of pin 8 of
IC2609 on the path.
No
Yes
IC2301 (Pin 114)
t
D1D2SI
Replace IC2301.
No
Yes
IC2301 (Pin 113)
Is the clock
signal o
u
tp
u
t
w
hile the
v
oltage at DSP1SS0 and
DSP1SS1 are "L"?
Is the clock
signal o
u
tp
u
t
w
hile the
v
oltage at DSP1SS0 and
DSP1SS1 are "L"?
Check the o
u
tp
u
t of pin 18 of
CN2601 on the path.
DSP2SS
D1D2SCK
IC2401 (Pin 37)
No
Check the o
u
tp
u
t of pin 3 of
IC2609 on the path.
No
v
IC2401 (Pin 36)
w
Yes
Does the logic
of XDSP2RST periodically
b
ecome "H" or "L"?
y
x
Yes
It is
v
ery diffic
u
lt to diagnose
w
hich part is in fail
u
re.
For the follo
w
ing diagnosis, a digital
oscilloscope m
u
st
b
e
u
sed.
Is the clock
signal o
u
tp
u
t
w
hile
the
v
oltage at DSP2SS
is "L"?
D1D2SO
Check the o
u
tp
u
t of pin 8 of
IC2609 on the path.
No
Yes
IC2401 (Pin 34)
D1D2SI
Replace IC2401.
No
Yes
IC2401 (Pin 35)
Is the clock
signal o
u
tp
u
t
w
hile
the
v
oltage at DSP2SS
is "L"?
Is the clock
signal o
u
tp
u
t
w
hile
the
v
oltage at DSP2SS
is "L"?
Is the logic of
XDSP2RST maintained
at "H"? (Does it fall to
b
ecome
"L" periodically?)
Summary of Contents for SC-LX72
Page 10: ...10 SC LX82 1 2 3 4 A B C D E F 1 2 3 4 2 2 PANEL FACILITIES 1 Front Panel ...
Page 11: ...11 SC LX82 5 6 7 8 5 6 7 8 A B C D E F 2 Display ...
Page 12: ...12 SC LX82 1 2 3 4 A B C D E F 1 2 3 4 ...
Page 13: ...13 SC LX82 5 6 7 8 5 6 7 8 A B C D E F 3 Rear Panel ...
Page 14: ...14 SC LX82 1 2 3 4 A B C D E F 1 2 3 4 ...
Page 15: ...15 SC LX82 5 6 7 8 5 6 7 8 A B C D E F 4 Remote Control In case of SC LX82 ...
Page 16: ...16 SC LX82 1 2 3 4 A B C D E F 1 2 3 4 ...
Page 17: ...17 SC LX82 5 6 7 8 5 6 7 8 A B C D E F ...
Page 18: ...18 SC LX82 1 2 3 4 A B C D E F 1 2 3 4 5 Remote Control In case of SC LX72 ...
Page 19: ...19 SC LX82 5 6 7 8 5 6 7 8 A B C D E F ...
