Teac A-4300SX - Take-Up Torque

TORQUE MEASUREMENT PROCEDURE
OTE: 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 g-cm or 0z*in) =
Weight or Force (in gm. 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 cal-
culated 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.
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Fig. 7-3 Torque Measurement
7-3. TAKE-UP TORQUE
1. Place the empty reel and attached spring scale on the
right reel table:
2. Place the deck in the Forward 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 a
steady reading.
5. The torque calculated valve should be approx:
370 to 410 g-cm (5.2 to 5.7 oz-inch)
6. Repeat the procedure for the Reverse play.
430 to 470 g-cm (6.0 to 6.6 oz-inch)
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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 Forward Play mode.
4. Pull the scale away from the reel against the motor torque
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.:
170 to 210 g*cm (2.4 to 2.9 oz-inch)
7. Repeat the procedure for the Reverse Play.
Using the right reel table. 180 to 220 g+cm (2.5 to 3.1
oz-inch)
Adjustment Location
If necessary, adjust slider of the resistors until you have the
correct scale reading for optimum torque. Refer to adj. lo-
cation below.
REVERSE FORWARD
TAKE-UP TORQUE |
| TAKE-UP TORQUE
t =
REVERSE uit c
=
BACK TENSION
FORWARD | ®
7-5 REEL HEIGHT ADJUSTMENT
Reel height adjustment is required only if a motor has been
replaced or if tape rubs excessively against the reel. Adjust-
ment is accomplished by FINE ADJ. screw in the reel turn-
table. Reel turntable height should be checked using stan-
dard 7” reels. With a tape threaded on the machine, position
the reel height for smooth tape travel. If adjustment is
necessary, remove the reel and adjust the screw. Then
replace the reel and re-check the adjustment.
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