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Trouble Shooting
Power LED
Blink
Trouble
LED
7
times
blink
<
50"
(TH-50PX50U, 50PX500U)
>
Trouble
Mode
and
Defective
Board
Trouble
Mode
Defective
Board
SS
Data
Energy
recovery
SS,
D, C,
P
How
to find
the defective
board
No(VDA
NG)
When
Power
SW
ON
VDA
(about
75V)
output
at
TPVDA
on
SS'
before
Shutdown
?
Yes
No(P
or
SS
NG)
Disconnect
SS35
(or
C35)
.and
SS42
(or
C42).
After
Power ON,
Power comes
up ?
(15V
or
Control Signal
NG)
Yes
r
(cjor
SS
NG)
Disconnect PI
2.
Short P12's 8
and
10pin.(*1)
.Power
SW
ON.
VDA
(about
75V)
output
at
P12's
1
or
2
pin
before
Shutdown
?
|res
No
No(C1
or
C2
or
C3 orSS NG)
SS
Board
P
Board
In
addition,
.Disconnect
Cl
1
(orC21).
After
Power ON,
Power comes
up
?
,
'Yv'es
Yes
(C4
oi|
C5
or
C6
or
SS
NG)
|ci Board!
Connect
SS35
(or
C35).
disconnect
SS42
(or C42)..
After
Power ON,
Power comes
up
?
No
In
addition,
Disconnect
C23
(or
C33).
No
'After
Power ON,
Power comes
up
?
,
Yv
?
|C2~Board|
Power
SW
OFF
In
addition,
<
Disconnect C35.
>
After
Power ON,
Power comes
up
?
r
^YeS
r—
C3
Board
SS
Disconnect
C42
and C43.
*C42's
1
or
2,
4
or
5,
7
or
8
pin—
Short
with
GND
Yes
No
Disconnect
C52
and
C53.
No
Disconnect
C61
.
No
<C53's
3,
5
,
6
pin
=—
I
<dC61
,
s
3,
5
pin
^>
Short
with
GND
?
Short
with
GND
?
C4
Board
r
^Tves
|C5 Boardl
Yes
|C6 Board]
|SS Board]
_
_
Disconnect PI
2.
When
Power
SW
ON,
No(15V
NG) P°
wer
SW
ON.
n
0
'DC
15V
output
at
TP15V
on
SS
:
KShort
P12's 8
and
1
0pin.(*1
)>-|
before
Shutdown
?
"^
TYes
(Con
trol
Signal
NG)
No
Disconnect
SS44.
Power
SW
ON.
(Then
Power
Comes
up)
Output
at
SS44's
(or
C44's)
1
,
14, 15,
1
7pin
?
(*2)
15V
output
at
P12's
4
pin
before
Shutdown
?
TYes
SS
Board
P
Board
D
Board
(*1)
The
reason
of short
is
that
SW_MAIN
signal
is
low
(STB
PS)
and
MC701
outputs
Relay
ON
signal
for
power
supply.
(*2)
Check
Pin
NO
:
Output
1
:5V(DC)
14, 15,
17
:
5V(PULSE)
—
need
oscilloscope
Power
Supply and
Protection
Circuit
Id
15V-K®-
-SW_MAIN-4@-
STB_PS-^j@-
Data
Energy Recovery
DET
condition
NO
VDA
NO
15V
NO
Data
Energy Recovery
Control Pulse
(SS44
14,15,17pin)
NO
P5V
(SS44
Ipin)
C6
|C61
C5
2l
_
C5
_
[C53 C43l
C4
^
||C44
H
H
H
H
H
H
H
h
H
H
H
GS
GK
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