Teac A-4070G - Brake Torque Adjustment

BRAKE TORQUE ADJUSTMENT PROCEDURES
NOTE
The brake torque is actuated mechanically. Pressure is set by
the variable spring force. While making this measurement and
adjustment, be careful not to bend the brake bands. As brake
torque will change with cleaning, brake drums and brake shoes
should be cleaned only when absolutely necessary. If cleaning
is required, use TEAC cleaner TZ-251B only. After cleaning
operate the machine for some time before performing the below
procedures.
Brake torque adjustments are made with no power applied to the
unit.
Place an empty 4" hub reel on the left reel table, and fasten one
end of a 30" length of string to the reel anchor.
. Wind several turns of string counterclockwise around the hub and
attach a suitable spring scale to the free end of the string.
Pull the spring scale away from the reel, making sure that the
string does not rub the reel flanges.
Take a 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.
The reading should be 1300 +100 g-cm (1620 oz~inch).
If adjustment is required, loosen the screw in the spring
mount and position the brake for optimum torque.
The adjustment of the right brake is the same, with the exception
that rotations are clockwise.
BRAKE BAND
MOUNT
M-0280
Fig. 6-4 Torque Measurement and Adjustment Location
IMPORTANT
The difference in torque between the right and left brake
should be kept within 50g-cm(0.7oz-inch).