Sharp VT-3448X, Service Manual

Page: 31 / 144

l Check that the reel disk is lower than part A but higher than
part If the height is not correct, readjust the reel disk
height by changing the
washer under the reel
disk.
Note:
Whenever replacing the reel disk, perform the height checking
and adjustment.
Reel disk height
adjusting jig
Mechanism chassis
,
Reel disk
1
Figure
CHECKING AND ADJUSTMENT OF
UP TORQUE IN FAST FORWARD MODE
Remove the cassette housing control assembly.
Make a short-circuit between and
both located at the right on your side on the main
Now plug in the AC cord.
Setting
Set a torque gauge to zero on the scale. Place it on the
take-up reel disk.
Press the
button to set the mechanism to the fast
forward mode.
To calculate the remaining capacity of the play back mode,
slowly rotate the supply reel disk, and then shift it into the
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
Torque gauge
\
or more
The is held at
I
its maximum value.
(Red mark)
l
Adjustment
If the take-up torque is outside the range, clean the capstan
motor pulley, drive belt and limiter pulley with cleaning
liquid, then recheck the torque.
If the take-up torque is still out of range, replace the drive
belt.
Notes:
Hold down the torque gauge so that it may not fly off.
When checking the take-up torque, do not keep the reel
disk locked for a longer time.
CHECKING AND ADJUSTMENT OF
UP TORQUE IN REWIND MODE
l
Remove the cassette housing control assembly.
Make a short-circuit between and
both located at the right on your side on the main
Now plug in the AC cord.
Setting
Set a torque gauge to zero on the scale. Place it on the
supply reel disk.
Press the
button to set the mechanism to the rewind
mode.
To calculate the remaining capacity, slowly rotate the
up reel disk, and then shift it into the rewind 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
Torque gauge
or more
gauge is held at
its maximum value.
(Red mark)
Figure
Idler gear
Take-up direction
Figure