Sharp VT-3428X Service Manual page 23

Check that the reel disk is lower than part A but
l
higher than
part
readjust the reel disk height by changing the
Note:
Whenever replacing the reel disk, perform the
height checking and adjustment.
Master plane
.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN FAST FORWARD MODE
Remove the cassette housing control assembly.
Make a short-circuit between TP8804 and
on the VCR PWB, with a 22 ohm resistor. Now
turn on the power.
Setting
Set a torque gauge to zero on the scale. Place it
on the take-up reel disk.
Press the FF button to set the mechanism to the
fast forward mode.
Checking
Turn the torque gauge slowly (one rotation
every 2 to 3 seconds) by hand in the take-up
direction.
Check to see if the take-up torque is higher than
I
or more
Reel disk height
adjusting jig
Reel disk
I
Figure l-7.
(Red mark)
3
Take-up direction
Figure l-8.
Adjustment
l
the capstan D.D. motor pulley, reel belt and reel
pulley with cleaning liquid, then recheck the
torque.
the reel belt.
Notes:
fly off.
the reel disk locked for a longer time.
CHECKING AND ADJUSTMENT OF TAKE-UP
TORQUE IN REWIND MODE
the
Remove cassette housing control assembly.
Make a short-circuit between TP8804 and
on the VCR PWB, with a 22 ohm resistor. Now
turn on the power.
Setting
Set a torque gauge to zero on the scale. Place it
on the supply. reel disk.
Press the REW button to set the mechanism to
the rewind mode.
Checking
Turn the torque gauge slowly (one rotation
every seconds) by
2 to 3
direction.
Check to see if the take-up torque is higher than
.
2
Figure l-9.
so that it may not
gauge
in the take-up
hand
The guage is held at
its maximum value.