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Topic: Philips FP-20
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John Moriarty
Film Handler
Posts: 50
From: Cambridge, UK
Registered: Feb 2002
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posted 05-15-2002 08:21 AM
We had a lot of problems with one of these not too long ago. Throughout the film we would get an underwater sound effect on the analogue sound. We found that turning down the tension of the take up feed on the tower fixed the sound problem, but this wasn't acceptable because it didn't always take up properly. Eventually we found a loose grub screw connecting the lower constant speed sprocket to the drive, allowing the the sprocket to run unevenly, and tightening it fixed the problem. (It took us a while to find because this had been hidden behind the flywheel that was fitted as part of the reverse scan sound reader). I'm not sure if this will help, but it is probably worth checking as it won't take too long to do. John
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 05-15-2002 11:45 PM
John,Pull off the flywheel plates...and spin the drum shaft (with the pinch roller raised)...see if the bearings are binding any. With the tiny drum, wow/flutter come in very easily. That is where I would start...then look at the pinch roller. Steve ------------------
"Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 05-16-2002 09:52 AM
I didn't say check the flywheel tightness, I said to remove it and check the drum bearings! Kinoton uses a bearing lubricant that can turn into honey and settle in the bottom of the bearings.Though there is a figure listed for the down pressure on the pinch roller, I normally use a loop of film with tone one it and see how long it takes to stablize. I go with the lowest pressure that allows a stable tone in less than 7 seconds (to ensure a flutter free changeover). If you get too much pressure, the film will "squish" out since Kinoton/Norelco use a tilted roller to force the film to the outboard edge of the roller (instead of a spring loaded flange). Often the pinch roller performs better when using "Cardan" oil (a little viscous)to provide damping. Again, start with the drum bearings first...get them all nice a free (probably need to be replaced), then get the drum shaft end-play right, then move to the pinch roller. Steve ------------------
"Old projectionists never die, they just changeover!"
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