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Sharp VC-90ET

Sharp VC-90ET
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CAPSTAN
MOTOR
TROUBLESHOOTING
Hew
Guat
hole
The
capstan
motor
fails
to
run.
ls
“H”
pulse
at
pin
@®
of
1¢701
?
YES
IsPC5V
atpin
M
of
MCsocket
?
YES
Is2.5Vatpin
@
of
MCsocket
?
YES
Is
"H”
pulse
at
pin
©
of
MC
socket
?
Is
the
voltage
at
pin
@
of
MC
socket
about
2.5V
?
YES
:
Is
12Vatpin
@
of
MCsocket?
YES
Replace
the
capstan
motor.
NO
NO
NO
NO
NO
NO
Check
IC701.
Check
the
PC5V
line.
Check
R713,
R714
and
all
the
way
up
to
the
2-5V
line.
Check
between
the
MC
socket
and
1C701,
and
between
the
MC
socket
and
IC801.
Check
pins
<
and
of
Serer
2
-Oan:-@
Check
the
AT
12V
line.
DRUM
MOTOR
TROUBLESHOOTING
The
drum
motor
fails
to
run.
Ils
“H”
pulse
atof
pin
@
of
1C701?
FLOW
CHART
NO.
9
Check
1€701.
Check
between
the
MC
socket
and
!€701
and
between
the
MC
Is
“H”
pulseatpin
©
of
ME
?
socket
and
iC801.
socket
Is
AT12V
atpin
@
of
ME
socket?
Check
the
AT
12V
line.
Replace
the
drum
motor.
The
drum
motor
runs
only
for
a
few
seconds.
Is
drum
PG
signalatpin
@
of
[NO
ME
socket
2
Check
the
drum
motor.
YES
Is
drum
PG
signal
at
pin
@
of
NO
Check
between
the
ME
socket
1C701
?
and
all
the
way
up
to
pin
@
of
YES
1€701,
(1C702)
Is
PG
MM
signal
at
pin
©
of
NO
Check
IC701.
Readjust
R751
(PG
1€701
?
MM
control).
YES
Is
H.
SW.
pulse
at
pin
@)
of
Ic701
|.
NO
Check
1¢701.
|
YES
Replace
!C701.
—<
2
j<e)
fo)
m
4

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