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Sharp VT-3418X - Page 56

Sharp VT-3418X
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DRUM SERVO TROUBLESHOOTING
FLOW CHART NO.
l-11
1
1
Drum servo
““;‘
not function.
3
1
Is there 8MHz
oscillation at ins
(31)
NO
and
(32)
of
IC
Ii3
.
c
Check
X8801,
C8832
01
?
and
C8833.
YES
In
PB
mode
1
in
REC
mode
NO
Is there the
durm
FG
YES
Is there the reference
+
f;ggd,;t
pin
(47)
of
*
signal (V-sync. ) at pin
(64)
of
IC8801
?
1
NO
Check pin (4) of the
harness ME and the
drum motor.
,
Is there the head
switching pulse at pin
NO
+
See FLOW CHART NO. l-l
2.
Check the composite
(22)
of
IC8801
?
sync. signal at pin (1) of
connector El from Y/C
YES
clrcult.
1
Is there the drum
Does the drum error
control
volta
e applied
“h
NO
_
amplifier circuit of
1~7701
NO
to pin
(6)
oft
e harness
-
(pins
(11,
(2)
and
(3))
ME?
operate normally ?
1
YES
Check and replace the
drum motor.
L
I
L
I
NO
I
Replace IC880
1.
I
I
Check
IC7701.
k-

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