Teac A-7300 - TORQUE MEASUREMENT PROCEDURE

TORQUE MEASUREMENT PROCEDURE
All Torque and Tension Measurement must be made with the automatic shut-off
switch (right tension arm) blocked to the "ON" position.
BACK TENSION:
Place the REEL size switch to the LARGE position.
Block the shut-off arm in the "ON" position.
Install an empty 7" reel (TEAC RE-702) on the left reel table.
Rotate the reel and wind several turns of string counter-clockwise
around the hub. Attach spring scale to string.
. Place the unit in the ( » ) play mode.
. Pull the scale away from the reel against the motor torque with
a steady smooth motion.
7. Note the scale reading while it is in steady motion.
( The string must not rub the reel flanges.)
8. Adjust R-155 as needed to obtain tension of 450 + 20 (g-cm).
(calculated value using T = R X W)
9. Repeat all the above for the REEL-SMALL position.
Reading should be 300 (g-cm).
FWNF
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TAKE-UP TORQUE:
1. Place the REEL size switch to the LARGE position,
with empty reel and attached spring scale on the right reel table.
. Place the unit in the ( » ) play mode.
3. Allow the rotation of the reel to slowly draw the scale toward
the hub.
. Hold the spring scale with enough force to allow a steady reading.
5. It should be approx. 550 + 20 (g-cm).
If adjustment is necessary, slide the band on R~154. (The same resistor
is also used for SMALL REELS).
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NOTE
To measure torque when using a reel with a hub radius of other
than 3.0cm refer to following table;
FORMULA FOR TORQUE CALCULATION:
T (g-cm)= R XW
R: radius of hub (cm)
W: gram
R155 R154 SPECIFICATIONS
TAKEUP TORQUE | BACK TENSION
550 +20 g-cm 450t20 g-cm
300 g-cm
PLAY- LARGE
HMI
Fig. 8 Torque Adj. Location
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