Teac A-2300SD - Mechanical Measurement and Adjustment; Pinch Roller Pressure; Brake Torque

7. MEASUREMENT AND ADJUSTMENT
-MECHANICAL-
The TEAC A-2300SD uses a highly reliable 3
motor drive system and should require a minimum
of mechanical maintenance or adjustment.
These adjustments are made at the factory.
Readjustment should only be required after many
hours of operation or component replacement.
7-1 PINCH ROLLER PRESSURE
NOTE: Pinch roller pressure is supplied by the pinch roller
spring arm and it is most important that the
solenoid plunger be fully bottomed before taking
pressure measurement.
1. Load tape or block the shut-off arm in the ON position.
2. Attach a suitable spring scale to the pinch roller shaft.
3. Place the unit in the PLAY mode ( ► ), and holding
the spring scale as illustrated, slowly draw it away
from the pinch roller.
4. Do not allow the string to rub against the pinch roller.
5. Note the reading on the spring scale at the instant the
pinch roller stops rotating.
6. The scale should Indicate 2.0 to 2.2kg. Optimum value
is 2.2kg (5.6 lbs).
7. If adjustment is necessary, loosen the 3 screws on the
capstan solenoid and position the solenoid for optimum
pressure.
8. Adjust solenoid-limit position so that the gap between
capstan shaft and pinch roller is approx. 7mm when
solenoid is not actuated. Limit is adjusted by loosening
the mounting screw (A ), then sliding limit until proper
position is obtained.
REPOSITION SOLENOID TO
OBTAIN OPTIMUM PRESSURE
CAPSTAN SOLENOID
CAPSTAN SOLENOID
LIMIT
MOUNTING
SCREW (A)
7-2 BRAKE TORQUE
The brake torque is actuated mechanically. Pressure is set
by the variable spring force. While making these measure¬
ments and adjustments, 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-261B. After cleaning, operate the brakes by
depressing the play and STOP buttons several times to
completely dry out the brakes before performing the
following procedure.
NOTE: Brake adjustments are made with NO power con¬
nected to the equipment.
1. 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.
2. Wind several turns of string counterclockwise around
the hub and attach a suitable spring scale to the free
end of the string.
3. 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.
4. The reading should be 1000 g-cm ±200 g-cm. (14 oz-in).
5. If adjustment is required, loosen the 2 screws shown
and position the brake for optimum torque.
6. The adjustment of the right brake is the same, with
the exception that rotations are clockwise.
(wind string CLOCKWISE around reel hub)
Fig. 7-1 Pressure Measurement and Adj. Locations
Fig. 7-2 Torque measurement and Adjustment Location
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