VT-341
8X
VT-5118X
CHECKING AND ADJUSTMENT OF
RECORD
/
PLAYBACK BACK TENSION
l
Remove the cassette housing control assembly.
l
Checking
Weight a
\\‘I/
_‘
/
/
Cl
REC
-
.
‘1
I\’
9
Push the record button
to place the unit
in the record mode.
VI
chassis
Figure
l-40.
I.
Put a cassette torque meter into the unit.
2.
Push the record button to place the unit
i-n
the
record mode.
3.
Check that the back tension indicated by the
gauge is within the set range
31
to
36
g-cm.
Notes:
1.
Make sure that the video cassette tape is over
the retaining guide.
\
2.
Make sure that the tape is not slack nor
damaged at either end.
l Adjustment
1.
If the reading of the cassette torque meter is less
than specified, move the tip of the tension spring
hook plate toward the hole A.
2.
If the reading of the cassette torque meter is
more than specified, move the tip of the tension
spring hook plate toward the hole
B.
Note:
Put a thin screw driver
(-)
in the shaft hole, lean
it toward you, and turn it for easier shift of the
tension spring hook plate in the direction of A or
B.
cf*
\
Tension spring
/Tension
spring
Tension spring hook plate
Tension spring
hook plate
Figure
l-41.
CHECKING THE BRAKE TORQUE
l
Checking the brake torque at the supply side
Torque gauge
‘,ysply
reel
djust the
idler gear
m
Mechanism chassis
Figure
l-42.
1
I
Remove the cassette housing control assembly.
2.
Place the mechanism in the stop mode by
unplugging the power cord in the fast forward
or rewind mode.
3.
Slowly rotate the torque gauge in the clockwise
(CW)
direction and counterclockwise
(CCW)
direction of the supply brake so that the reel disk
and the indicator of the torque gauge rotate at
an equal rate. Check that the values are within
the range of
CW
direction =
250
to
750
gem,
CCW
direction
=90
to
130
g-cm,
and that the
brake torque in the
CW
direction is at least twice
as high as that in the
CCW
direction.
30
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