Teac A-3340S - Page 19

BACK TENSION
TAKE-UP TORQUE
REWIND BACK TENSION
PWNR.
TORQUE MEASUREMENT PROCEDURE
Load tape or block the shut-off arm in the ON position.
Place an empty 7" reel with a 2" diameter hub on the left reel
table.
Rotate the reel and wind several turns of string around the hub.
Attach spring scale to string.
Place the unit in the ( Bm) play mode.
Pull the scale away from the reel against the motor torque, with.
a steady smooth motion.
Note the scale reading while it is in steady motion.
. Make sure the string does not rub against the reel flanges.
The reading should be approximately:
(REEL SW{ BACK TENSION
LARGE | 300%320 g-cm
SMALL | 180%210 g-cm }
Place the empty reel and attached spring scale on the right reel
table.
Place the unit in the (™) play mode.
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 peadiauy
It should be approximately: REEL SW] TAKE-UP] TORQUE
LARGE | 780°820/g-cm
SMALL | 380%400]/g—cm
Load a full 1,800 ft reel of tape (7-1/2") on the right. reel table.
‘Place an empty reel with 2" rub on the left reel table.
Place the unit in the fast rewind mode.
At this time observe the right tension arm,
The arm should move approximately 1" to the right and remain
there.
Check vaiue of R4 (1.2k) if movement is extremely incorrect.