This is topic Kinoton FP20 picture bounce in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Michael Harlow (Member # 1353) on 08-13-2002, 03:52 PM:
Hi, Can any one help.I got an FP20 with a bouncing picture ! we've replaced the skates, the runners etc etc, different films.... But still a bounce, any ideas ?
Posted by John Pytlak (Member # 331) on 08-13-2002, 03:53 PM:
Gate tension?------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
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Posted by Ben Wales (Member # 92) on 08-13-2002, 04:21 PM:
worn intermittent sprocket or unit, any play?
Racking bush could also effect picture if worn.
Posted by Mitchell Dvoskin (Member # 751) on 08-13-2002, 04:26 PM:
If none of above, then the only other options are:Loose lens mount.
Bad intermittent.
/Mitchell
Posted by Pete Naples (Member # 761) on 08-13-2002, 05:53 PM:
I've had a motor go bad on one that set the whole machine vibrating, bad enough to show on screen.Most likely is worn cross-box, the framing bush tends to cause a 'nod' rather than a jump and is usually acompanied by the framing not staying put throught a feature. You can sometimes adjust the framing bush if it's not too badly worn.
Posted by Gordon McLeod (Member # 33) on 08-13-2002, 08:14 PM:
check and see if the jump is consistant across the whole range of the framers position
Posted by Don Sneed (Member # 955) on 08-13-2002, 10:53 PM:
I have turned the screw on the end of theintermittent sprocket assy. only a little & the jump stop....If you turn it to much you bind the coupler...
Posted by Pete Naples (Member # 761) on 08-14-2002, 02:39 AM:
Good point Gordon!More often that not if the bush is worn, you can steady the picture up with the framing at one end of it's travel, usually all the way down.
Posted by Stephen Jones (Member # 16) on 08-14-2002, 03:00 AM:
I had the same problem with a FP30 some time ago and it turned out to be a worn racking bush replaced and all was fine,when they start to wear it usely means that you have to replace it, no point in trying to adjust a worn racking bush just a wast of time. This is based on my experience with these.
Steve 
Posted by Michael Schaffer (Member # 1204) on 08-14-2002, 03:36 AM:
What is a racking bush? I mean, I probably know what it is, but I am unfamiliar with the English term.
Michael
Posted by Steve Guttag (Member # 268) on 08-14-2002, 08:58 AM:
I believe they are referring to the "coupling bushing"... which to you would be a "Buchse fur Bildverstellung"In laymens terms...the funky splined thingy that couples the intermittent mechanism to the intermittent sprocket shaft assy.
Steve
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"Old projectionists never die, they just changeover!"