Fostex A-8 - Page 33

e) If adjustment is required, hook the spring to the next hole.
Torque will increase as the spring is successively hooked to holes in the
outward direction.
f) The adjustment of the right brake is the same, with the exception that rota 
tions are clockwise (wind string CLOCKWISE around reel hub) . The torque
should be the same as for the left brake.
3) Tape tension adjustment procedures
Tape tension is adjusted in the PLAY mode only, and are fixed for the F.FWD
and REWIND modes.
Tape tension is determined indirectly by measuring the torque supplied by the
supply and takeup motors.
BACK TENSION
O .......................... ‘ ■ 1 ■ "
TAKEUP TORQUE
Fig. 6-10
* Back tension adjustment procedures *
1) Block the shut-off arm in the ON position.
2) Place an empty 7" reel on the left reel table.
3) Manually rotate the reel and wind several turns of twine around the hub.
Attach spring scale to other end of the twine.
4) Place deck in the PLAY mode.
5) Pull the scale away from the reel against the motor torque with a smooth,
steady motion.
6) Read the scale while it is in steady motion and multiply this value by the
hub radius to obtain the torque.
7) Be sure the twine is not rubbing against the reel flange when taking meas 
urements .
8) The specified torque is 7.8 in-oz (220 g-cm) , ±20%.
9) If adjustment is required, adjust R161, 22Kfi pot, as required.
* Takeup tension adjustment procedures *
1) Place an empty 7" reel, with a spring scale attached to the hub by a length
of twine, on the right reel table.
2) Place deck in the PLAY mode.
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