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Topic: Problem with my Revere p90
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Rob Young.
Phenomenal Film Handler
Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003
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posted January 29, 2013 03:29 AM
Ah, sounds like you've got something out of adjustment then.
The shutter and claw do have to be synchronised or you will see ghosting (where instead of the shutter opening to show a still frame, it opens as the claw moves the film and you project the movement instead of a still image).
But that in itself shouldn't cause the lower loop to be lost (tighten).
It sounds like maybe the claw isn't engaing the sprocket holes correctly. I'm not familiar with the Revere, so we'll have to call upon some of the projector technitions here on the forum.
I'd double check everything you took apart to make sure it all looks tight. If the claw isn't protruding correctly through the gate, it will mis-engage the sprocket holes and cause the film to stutter, or if it is mis-aligned, it can hit the film itself rather than the sprocket holes and cause a similar result.
Alignment of the claw is quite a precise and tricky business.
Either way, as it isn't travelling throught the gate properly, the lower sprocket will cause the lower loop to tighten and possibly cause damage to the film.
If we can get this sorted, for future cleaning, it shouldn't really be neccesary to dismantle anything. Projectors are designed differently, some have gates which swing completely open by swinging the lens and gate pressure plate assembly open, others are more difficult to access, but you should be able to get enough access to gently clean with a cotton bud or compressed air duster.
Last thought, if you can see the gate pressure plate, that's the sprung part of the gate just behind the lens, make sure it is correctly in place by giving it a couple of moves back and forth on it's springs. Calling our projector techs on the forum!!!
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