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Sharp VC-90ET

Sharp VC-90ET
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POWER
TROUBLESHOOTING
The
VCR
Is
dead.
Unplug
the
AC
power
cord.
Replug
it
a
few
minutes
later.
NO
Is
the
fuse
alright
?
Replace
the
fuse.
YES
TIMER
(1)
TROUBLESHOOTING
FLOW
CHART
NO.
1
FLOW
CHART
NO.
2
The
display
tube
fails
to
light
up.
Is
AT
5V
applied
atpin
@
of
1€5001
?
Yes
Is
AT
-
30V
applied
at
pin
of
1€5001
?
YES
's
there
oscillation
at
pins
(0)
and
®
of
15001?
©
Check
the
AT
5V
line.
Check
the
Power
unit
AT
-30V
line.
NO
Check
for
short
in
the
main
PWB
,
fuse
resistance
and
Are
the
ATI2V,
AT-30V,
AT6.5V
and
AT45V
lines
normal
?
YES
Check
FL5001
and
1C5001.
.transistor
trouble
in
the
power
unit,
etc.
ly
NO
Does
pin
of
1C5001
change
NO
from
"L
“to”
H”
level
when
the
power
is
turned
on
?
Is
the
display
tube
illuminated
?
See
FLOW
CHART2.
Check
1€5004
and
05034.
YES
YES
Are
the
ATSV
and
GND
lines
NO
‘
properly
connected
with
IC801
?
Check
for
poor
soldering.
ie
ral
ag
applied
at
pin
©
of
Check
Q805
and
Q806.
YES
YES
Is
there
oscillation
at
pins
and
{NO
6
of
ICBO!
?
pins
@
Replace
1C801
and/or
X801.
Is
DC
3.6V
applied
between
D/O
and
@)
/
Gof
the
display
tube
?
Check
the
power
unit.
YES
YES
fon
an
A
Maca
eeitphe
ve
NO
Check
pin
63)
of
IC801
or
pin
®
the
power
is
turned
on?
of
ICS001.
Dose
the
display
tube
function
?
Check
for
cracks
on
the
tube.
YES
YES
Check
P-CON
SW
Q6606
in
the
main
PWB
for
malfunction,
Check
Replace
ICS001.
also
the
9.4V
regulator
in
the
Is
PC9.4V
supplied
from
the
power
unit
?
z
°o
power
unit.
<
.
©
Oo
m
4

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