Sharp VC-90ET

VC-90ET
CHECKING
AND
ADJUSTMENT
OF
RECORD
/
PLAYBACK
BACK
TENSION
A. When using a cassette torque meter:
Remove the cassette housing control assembly.
Checking
Weight of 500g
Cassette torque meter
: Push the record button
to place the unit
in the record mode.
Figure 1-40.
1.
Put
acassette
torque
meter
into
the
unit.
2.
Push
the
record
button
to
place
the
unit
in
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.
@ 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. tf the reading of the cassette torque meter is
more than specified, move the tip of the tension
spring hook plate toward the hole B.
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.
x
Tension
spring
gu
Hole A
Tension spring
hook plate
Figure 1-41.
Tension spring hook plate
an
Figure 1-42. Not used.
CHECKING THE BRAKE TORQUE
@ Checking the brake torque at the supply side
Supply
reel disk
ar
CW: 280-720g-cm
CCW: 90-230g:cm
Adjust the idler gear
Mechanism chassis in the center
Figure 1-43.