Sharp VC-H92HM Serviceanleitung Seite 22

CHECKING THE BRAKE TORQUE
@ Checking the brake torque at the supply side
=
CCW: 10+ 4mN-m (102 + 41gf-cm)
CW: 35+20mN-m (357 + 204gf-cm)
Figure 4-24.
Remove the cassette housing control assembly.
Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main 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.
. Switch from the FF mode to the STOP mode.
. Disconnect the AC power plug.
Checking
. Slowly rotate the torque gauge in the clockwise
(CW) direction and counterclockwise (CCW) di-
rection 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 = 35+20mN-m
(357 + 204gf-cm), CCW direction = 10+4mN-m
(102 + 41gf-cm), and that the brake torque in the
CW direction is at least twice as high as that in
the CCW direction.
21
Take-up reel
disk \
CCW: 35+ 20mN-m (357 + 204gf-cm)
CW: 10+4mN-m (102 + 41gf-cm)
Figure 4-25.
@ Remove the cassette housing control assembly.
@ Make a short-circuit between TP5001 (or jumper
pin 241) and TP5002 (or jumper pin 242) , both
located at the left on your side on the main PWB,
with a 22 ohm resistor. Now turn on the power.
® Setting
1. Set a torque gauge to zero on the scale. Place it
on the take-up reel disk.
2. Switch from the FF mode to the STOP mode.
3. Disconnect the AC power plug.
@ Checking
1. Slowly rotate the torque gauge in the clockwise
(CW) direction and counterclockwise (CCW) di-
rection of the take-up 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 CCW direction= 35+20mN-m
(357 + 204gf-cm), CW direction = 10+ 4mN-m
(102 + 41gf-cm), and that the brake torque in the
CCW direction is at least twice as high as that in
the CW direction.
@ Adjustment of the brake torque at the supply
side and the take-up side
1. If the supply or take-up brake torque is outside
the range, clean the supply or take-up reel disk
break lever pad, then recheck the torque.
2. If the supply or take-up brake torque is still out-
side the range, replace the main brake ass'y or
the main brake spring.
Note:
When the main brake is replaced, perform the
height checking and adjustment of reel disks (see
page 15), and the brake torque checking.