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Author Topic: Chinon 2500GL projector, loosing loops Michael Gerrity Film Handler Posts: 3 From: Chicago, IL USA Registered: Jun 2013 posted 07-01-2013 01:12 AM                     I have a Chinon 2500GL Dual 8 Projector, however, I am having some issues with the film slipping through the gate. As far as I can tell what's happening is the film is loosing it's lower loop. Does anyone know of a good solution to fix this? If I can I'd really like to hold onto this projector since it does dual 8. Thanks!  |  IP: Logged Leo Enticknap Film God Posts: 7474 From: Loma Linda, CA Registered: Jul 2000 posted 07-01-2013 04:51 AM                        There are a number of possible causes. I'd guess that the most likely one is an issue with the mechanism that drives the claw in the side of the gate, which inserts through a perforation in the film and pulls it down. If that's not doing its job properly, but the sprocket below it is still rotating, the sprocket will in effect be dragging the film through the gate, thereby causing the loss of a loop. Try opening the back cover of the projector (with the power disconnected, obviously), lacing up some film in it and then advancing the mechanism manually, by rotating the inching handle (if there is one) or drive shaft. Does it occasionally miss a frame as it moves intermittently through the gate? If so, that's your culprit, and you possibly need to adjust the claw mechanism so that it extends further on each cycle. If not, worn belts is another thing to check for, especially if any of them are toothed. Another possibility could be a broken tooth on the lower sprocket, in which case you're probably looking at trying to get another projector on Ebay to use for spares.  |  IP: Logged Bruce McGee Phenomenal Film Handler Posts: 1776 From: Asheville, NC USA... Nowhere in Particular. Registered: Aug 1999 posted 07-01-2013 02:10 PM                     Excessive take-up tension can cause lower loop loss.  |  IP: Logged

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