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Sharp VC-90ET

Sharp VC-90ET
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tg
of
1C702
?
Check
pin
@
of
the
harness
ME
and
the
drum
motor.
ts
there
the
amplituded
drum
FG
signal
at
pin
©
Check
the
signal
line.
DRUM
SERVO
TROUBLESHOOTING
Drum
servo
does
not
function.
\s
there
the
clock
input
at
pin
@
of
1€701?
(4.43
MHz
in
PAL/MESECAM/SECAM
mode,
3.58
MHzin
NTSC
mode;
Jevel
at
about
0.3
Vp-p)
Check
the
main
PWB
and
the
line
between
the
main
PWB
and
pin
@
of
1¢701.
In
REC
mode
In
PB
mode
Is
there
the
reference
signal
compestie
sync)
at
pin
Gq
of
1C701?
Is
there
the
durm
FG
signal
at
pin
©
of
1€701?
Isthere
the
head
Check
the
Composite
switching
pulse
atpin
See
FLOW
CHART
NO.13.
sync
signal
generator
in
@
of
1801
?
Y/C
circuit.
YES
Is
there
the
drum
APC
output
at
pin
Q)
of
1€701
and
the
drum
AFC
output
at
pin
of
IC701
?
Replace
'€701.
Is
there
the
drum
control
voltage
applied
1°
pin
©
of
the
harness
is
pin
G
of
1801
in
high
impedance
?
Replace
the
drum
motor.
Replace
IC801.
FLOW
CHART
NO.
10
<
2
©
2)
m
+

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