VSX-LX50
30
1
2
3
4
1
2
3
4
C
D
F
A
B
E
5. DIAGNOSIS
5.1 DIAGNOSIS FLOWCHART
5.1.1 DSP TROUBLESHOOTING
•
I
t is assumed that there is no loose connection or damage in the LCRs.
S
implified
diagnosis
Herein is described ho
w
to easily diagnose a de
f
ective part in the
D
SP Assy, only
w
ith operations o
f
the main unit.
E
rrors in
D
SP Assembly
(
Areas simply and roughly predictable by machine operation only
)
•
Sound abnormality in phase control
If
sound abnormality does not occur in the phase-control O
FF
state but occurs in the phase-control O
N
state, it is most likely
that a
f
ailure has occurred in SPAM
(I
C107
)
, LATCH
(I
C103
)
or
DE
CO
DE
R
I
C
(I
C105
)
in the 1st
D
SP Block.
•
N
o sound at analog signal input
If
sound abnormality does not occur
w
ith a digital signal input
(
COAX, OPT
)
but occurs only
w
ith an analog signal input,
it is most likely that a
f
ailure has occurred in the A
D
converter
(I
C481
)
.
S
tep
2
:
P
ower
supply
S
tep
1:
C
onnections
C
N
901, C
N
401, C
N
951, C
N
801
Are the
connectors securely
inserted?
I
nsert the connectors
securely.
N
o
C
N
901
(
Pins 13,14
)
I
C301
(
Pin 13
)
I
s the
voltage o
f
digital
po
w
er around
5.2
V
?
N
o
D
igital 5
V
input
N
o
Replace C
N
901.
Check the po
w
er output
o
f
the main unit.
Y
es
Y
es
I
s there
any loose connection
at pins 13,14 o
f
C
N
901?
I
s the voltage
around 5.2
V
?
N
o
Y
es
A
Y
es
C
N
301, C
N
953
Are the
FF
C securely
inserted?
I
nsert the
FF
Cs
securely.
N
o
Y
es
To Step 2
S
tep
0
:
P
reliminary
confirmation
Con
f
irm the
f
ollo
w
ing items be
f
ore checking
D
o scre
w
s
o
f
COAX Jack
securely tighten
?
Tighten scre
w
s securely.
N
o
Y
es
D
oes a XM
antenna pull o
ff
?
Pull o
ff
a XM antenna.
N
o
Y
es
To Step 1
C
N
301
(
Pin 9
)
I
s the voltage
around 5.2
V
?
N
o
Y
es
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
Check the parts and patterns
in the path.
I
C502
(
Pin 5
)
XM Load S
w
itch
I
s the voltage
around 5.2
V
?
N
o
Y
es
T
roubleshooting
•
:
KUXJ and KUXJ
/
CA types only
