Teac A-3300SX - Take-Up Torque; Back Tension

TORQUE MEASUREMENT PROCEDURE
NOTE: The following torque measurements should be ;
made with a spring scale that is calibrated to read
Torque in gram-cm. for a 7” reel with a small reel
hub. If the spring scale you are using is calibrated |
to read Force or Weight in grams the Torque must
be calculated using the Formula:
Torque (in gm+cm or 02:in) =
Weight or Force (in gr. or 02.) x
radius of hub (in cm or inches)
If you are using a reel with other than the standard 2.5" or |
6.0 cm (approx.) diameter hub, the Torque must be calcu-
lated using the same formula and substituting the actual
radius and Weight or Force reading.
All Torque and Tension measurements must be made with
the automatic shut-off switch (right tension arm) held in
the ON position.
Brake Torque Measurement should be made using large hub
reel with a hub diameter of 4” or 10.2 cm.
1-626
Fig. 7-3. Torque Measurement and Formula
7-35 TAKE-UP TORQUE
1. Load the empty reel and attach spring scale on the right
reel table.
2. Place the deck in the Play mode.
3. Allow the rotation of the reel to slowly draw the scale
toward the hub.
4. Hold the spring scale with enough force to allow asteady
reading.
5. The torque reading should be approx.:
REEL SW
780 to 820 g cm (11 to 11.4 oz-inch)
350 to 430 g cm (5.0 to 6.0 oz-inch)
380 to 400 g cm (5.3 to 5.6 oz-inch) for A-2300SX
12
7-4 BACK TENSION
1. Place an empty 7” reel with small hub 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 counter-clockwise around the
hub. Attach spring scale to string.
3. Place the deck in the Play mode.
4. Pull the scale away from the reel against the motor tor-
que with a steady, smooth motion.
5. Note the scale reading while it is in steady motion.
(The string must not rub the reel flanges)
6. The calculated value should be approx.:
REEL SW BACK TENSION
LARGE | 300 to 320 g cm (4.2 to 4.5 oz-inch)
SMALL | 180 to 210 g cm (2.5 to 3.0 oz-inch)
180 to 210 g cm (2.5 to 3.0 oz-inch) for A-2300SX
Adjustment Location
If necessary, adjust slider of the resistors until you have the
correct scale reading for optimum torque. Refer to adj.
location below.
. RI TAKE = roROUE I
A-2300SX
Fig. 7-4 Adjustment Locations