Threading The Fi I M - Siemens 2000 Service Manual

Threading the film
Thread the film around the upper sprocket
6 and into the film channel 13 in the same
way as has been specified for the silent
2000 projector. Then insert the film emerg-
ing from the film channel 13 between brake
roller 37 and pressure roller 39, leaving a
.... loop according to the mark on the projector,
in such a way that it is contained between
the lateral guide flanges of the brake roller.
If the pressure roller rests against the
brake roller, move it down until, by pres-
sure on the projecting pin, it locks in its
central position.
When the film is in its proper position, let
the pressure roller 39 engage by pressing
the button 38. Pass the film around the
sound drum 41, over the filter roller 42, be-
low the sprocket 16 and over the idler roller
47. After checking that the teeth have en-
gaged the sprocket holes in the fi I m, hold
the film and pivot the pressure pad 17 into
its operative position. Now run the film
under the idler rollers and thread the lead-
ing end into the empty reel. Pu ll down the
loop formed between film channel 13 and
brake roller, in order to straighten the film
between the brake roller 37 and the sound
drum 41. Should the loops now be consider-
ably larger or smaller than shown in the
illustration, open the pressure pad 7, re-
move the film from the upper sprocket 6,
adjust the size of the upper and lower
loops, re-apply fi I m to sprocket 6 as speci-
fied and pivot pressure pad 7 into the
operative position.
4
Check whether the film is fed properly and
the loops maintain the specified size by
brief depression of the button for short trial
runs 46.
This completes the preparations for sound
fi lm projection in the case of the sound
projector with optical soundhead. However,
if your sound projector has a soundhead
for both optical and magnetic sound re-
production (Fig. 4), the change-over switch
60 must be set in addition according to the
type of sound track employed:
~
c
0
for reproducing magnetic sound
film
for reproducing optical sound
film
this sett ing is not required wi th a
sound projector provided with a
12-W reproduction amplifier.
If silent film is to be shown in a sou nd
projector, the film coming from the fi lm
channel13 may be threaded directly around
the lower sprocket 16, as shown in Fig. 5.
In this case, the pressure rol ler 39 should
be applied to the sprocket in addition to
the pressure pad 17.
Important:
When the projector is not in operation, the
pressure roller 39 should not rest agamst
the brake roller 37, but shou ld be locked
in its center position.