Bell and Howell 1598, User Manual

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P a n chromatic TQIII & TQIII Specialist User Manual
Page
23
Remedy
See introduction to "Manual Threading" section below.
Manual threading and unthreading
The automatic threading system of this projector is fast, effective, and (because it cannot
"make mistakes") kind to films. Manual threading is, therefore, recommended only if you
do not wish to project a spool from the beginning but, instead, need to start at some
intermediate point. Even then, if your selected scenes are not far from the beginning, you
may prefer to rely upon automatic threading and then leave the projector, with the lamp
off and the sound turned down, to advance the film to the correct point. Similarly, manual
unthreading will in normal circumstances be necessary only if, after showing part of a film,
you need to remove it from the projector before the front spool is empty. One other
reason for manual unthreading may arise if a weak join in the film has failed at some point
so that the threading path now contains two separate lengths of film. This problem can
often be solved by using the switch. Allow one part of the film to run out of the projector
to the rear. Reverse the mechanism and run the other part out at the front. Rethread the
front part automatically and, when the tip emerges from the projector, insert it under the
loose turns of film on the rear spool until it is held sufficiently firmly to be taken up
normally as the spool rotates. Always have the main access door open (Stage 34) when
using the forward and reverse switch positions to clear the film from the projector. You
can then keep the film path under observation. If the film is "bunching" at either side of
the broken join, switch off at once and manually unthread that part of the film which
cannot be safely run out of the projector under power.
In the instructions which follow, it is assumed that the film is to be threaded and
unthreaded at some intermediate point—that is, with a partially loaded spool on each of
the spool spindles. Manual threading and unthreading are both easier if the projector is on
a high stand or - after you have removed the power lead - lying on its side.
Manual threading
1. Mount the two loaded spools on their correct spindles -with the film to be
projected on the front spindle -and secure them with the spool locks. Pull off a loop
of film about 4ft (1.2m) long for threading.
2. Pull open the main access door.
3. Pull the front of the lens barrel towards you to open the film gate 35a.
4. Ensure that the automatic threading lever is in the "run" 36a and not the "thread"
position, If it has been set to 'thread", release it by light backward pressure or.
roller 36b.