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Topic: How can deal with this "light problem" (ST1200)
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Graham Ritchie
Film God
Posts: 4001
From: New Zealand
Registered: Feb 2006
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posted February 15, 2008 02:21 AM
Winbert
Just check the claw first, make sure you dont have a broken spring before doing anything with the shutter, does the film go through the projector OK? although the shutter timing is out its the "why" I have never seen a shutter come loose, anyway check your claw springs first.
Regarding the shutter and what it does, simply put, it stops the light from the lamp reaching the film and therefore the lens while the claw pulls the film down through the gate, this is from the moment the claw starts at the top until it is finished at the bottom. Once the film has fully stopped thats when the shutter allows light to pass through the film.
If light hits the film while its still in motion thats where the "Ghosting" image will come from. To quickly check your projector with it "unpluged" the lens holder swung open and with a magnifying glass slowly manually turn the projector in the fwd direction, watch the claw see what it does, and at the same time look through the aperture plate, so you can watch the shutter at the same time, both claw and shutter should work as described, well thats roughly what it does.
Graham.
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James E. Stubbs
Expert Film Handler
Posts: 104
From: Portland, OR
Registered: Apr 2007
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posted February 19, 2008 07:38 PM
I made sure it was a jpeg and less than 200k and less than 500 pixles wide. It just came up w/ an internal server error. I've emailed the orignal tiff scan to you. In any case here's the instructions:
B-3, Shutter, (17)
Incorrect postion of the shutter; Shutter flows (Picture trails).
Flaws on shutter or deflection; Flutter
1. Attach the shutter to see that it covers teh aperture mask whenver the claw transports film. Refer to Fig.8.
2.After Attaching the machine frame to the projector, Check the shutter postion again as following procedure.
Load the filmand turn the motor knob to still projection.
Turn the threading knob in foward direction and observe a picture. In this case, it is nomal that the picture does not move. If picture moves just before going out, change the shutter postion in forward projection direction. If picture moves just after appearing, move the shutter in reverse projection direction. (They're reffering the the adjustments on the shutter held w/ three screws. Also can be rotated about axes of shaft to correct claw/shutter timing.)
Cheers,
--------------------
James E. Stubbs
Consultant, Vagabond, Traveler.
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