Tape Tensioner - TANDBERG 15 Series General And Technical Information

990226
M355
215743
200549
200628
219198
M307
209658
202230
218415
990228
217510
218767
Fig. 4.8 Supply turntable assembly, Series 15.
4.2.2 Supply Turntable (990226) for series 15
See fig. 4.8.
Proceed as in 4.2.1 until the mylar sheet has been
put on the top of the friction disc. While pressing the
flange 219816 down into the upper end of the bearing
housing, insert the two springs 217510 into the cir-
cular recesses in the friction disc. Then place the
tape tight disc on top with its smaller guide pins
extending into the springs. Put the turntable shaft
through the bearing housing. Set the operating lever
990225 in position fast forward winding.
The friction wheel is pressed down by the lever and
the turntable rests on the tape tight disc 219198. Put
the teflon washer M355 down on the turntable shaft
before the hexagonal delrin bushing 218767 is
screwed on. The turntable should now move freely,
and the axial slack of the turntable shaft should be
approx. 0.1 mm (4 mil).
4.2.3 Tape Tensioner
When the instantaneous start/stop lever is operated in
normal forward drive with a full 7" reel on the supply
turntable, there might be a tendency to forming of
tape loops between the supply reel and the head
covers. In order to avoid this, a slight breaking torque
is applied on the supply turntable.
Adjustment:
Adjustment is accomplished by stretching or cutting
the two springs 217510 until the breaking torque is
sufficient to prevent forming of loops during normal
forward drive and when the tape is stopped with the
instantanous start/stop lever. Use a full 7" reel on the
supply turntable.
10