Fostex A-8 - Page 32

f) Adjust position of the solenoid-limit so that the gap between capstan shaft
and pinch roller is approximately 4mm when the solenoid is not actuated.
Limit is adjusted by loosening the mounting screw (A) , then sliding the l im it
until the proper gap is obtained.
2) Brake torque
Brake torque is applied mechanically. Pressure is set by the variable spring
force, while making these measurements and adjustments, be careful not to bend
the brake bands. As brake torque will change after cleaning, brake dmma and
brake shoes should be cleaned only when absolutely necessary. If cleaning is
required, use alcohol. After cleaning, operate the machine for a month of normal
operation before performing the procedures below.
Brake adjustments are made with NO power to the equipment.
a) place an empty 2" hub reel on the left reel table, and fasten one end of a
30" length of twine to the reel anchor.
b) wind several turns of twine COW around the hub and attach a suitable spring
scale to the free end of the twine.
c) Take reading only when the reel is in steady motion since the force required
to overcome static friction will produce a false, excessively high initial
reading.
d) The reading should be 28.5 % 42.0 in-oz ( 800 'V 1200 g-cm) .
Spring
Fig. 6-9
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