VSX-LX50
37
5
6
7
8
5
6
7
8
C
D
F
A
B
E
F
G
Replace
I
C651.
Y
es
HBCK
I
C651
(
Pin 6
)
N
o
I
s there
a bit clock
input?
N
o
I
s there
abnormality at the
parts and patterns
in the input path?
S
tep
4-4:
When
a
sound
is
not
out
with
the
XM
R
adio
To Step 5-1
Replace
I
C651.
Y
es
N
o
I
s there
a bit clock
input?
N
o
I
s there
abnormality at the
parts and patterns
in the input path?
To Step 5-2
If
there is not abnormality in the path
to the crystal, replace
I
C501 or X501.
I
C501
(
Pins 26,28
)
OSC
I
nsert the XM Antenna and check it.
N
o
Y
es
Check the path to the microcomputer.
I
C651
(
Pin 13
)
D
S
D
R0
N
o
Y
es
I
s the voltage
3.3
V
?
Check the path to the microcomputer.
I
C501
(
Pin 11
)
XMRST3
I
s the
input signal
3.3
V
?
N
o
Y
es
Check the path to the microcomputer.
I
C501
(
Pins 3,5
)
XM
DI
3, XM
D
O3
D
oes
I/
O signal operate
w
ith 0
V
to
3
V
?
N
o
Y
es
I
C501
(
Pins 18,19
)
COMM_RX_P
/
M
Check the path to the microcomputer.
I
C601
(
Pin 1
)
XMSW3
I
s the
voltage
3.3
V
?
N
o
Y
es
Check the path to the microcomputer.
I
C651
(
Pin 1
)
H
D
SW
I
s the
voltage
0
V
?
N
o
Y
es
D
S
D
L0
I
C651
(
Pin 3
)
HBCK
I
C651
(
Pin 6
)
Replace
I
C651.
N
o
I
s there
abnormality at the
parts and patterns
in the input path?
I
s there
a audio data
input?
N
o
Y
es
Replace
I
C651.
N
o
I
s there
abnormality at the
parts and patterns
in the input path?
I
s there
a audio data
input?
S
tep
4-3-
2
:
When
a
sound
is
not
out
with
the
H
D
M
I
(
When
the
source
is
SACD)
I
C651
(
Pin 1
)
H
D
SW
N
o
Y
es
Y
es
(
About 1.2
V
center
)
Abnormality in XM
Antenna or replace
I
C501.
N
o
N
o
I
s a
signal o
f
C
N
501-
pins 2 and 3 unstable
at 200m
V
p-p level?
I
s a
signal unstable at
200m
V
p-p level?
D
oes
crystal oscillate
about 2 to 3
V
p-p?
Y
es
Check the parts and
patterns in the input path.
•
:
KUXJ and KUXJ
/
CA types only
Replace
I
C651.
Y
es
H
FD
T
I
C651
(
Pin 3
)
N
o
I
s there
a audio data
input?
N
o
I
s there
abnormality at the
parts and patterns
in the input path?
