|
Author
|
Topic: Help with Sankyo 800 please
|
|
|
|
|
|
|
James N. Savage 3
Phenomenal Film Handler
Posts: 1375
From: Washington, DC
Registered: Jul 2003
|
posted February 04, 2004 03:02 PM
Hi Mal,
I have owned and used Sankyo 800's for most of my hobby since 1980 or so. It sounds like the same problem I had on one of my machines recently. After about a minute or so of running a film, the film would start jumping and when I looked inside, the top loop was gone. This would re-occur over and over.
This is how I resolved the problem (please excuse my ignorance on technical terms, bear with me):
While running a film, as it starts to jump the loop, slightly open the film gate (the part between the bulb and the lense that opens easily that the film goes through). You may notice that the film will ride smoother, but you will lose some of the focus. The loop should hold.
If everything happens as I have stated above, let me know and I will tell you how I resolved the problem with mine.
Nick.
| IP: Logged
|
|
|
|
|
|
Maurizio Di Cintio
Jedi Master Film Handler
Posts: 977
From: Ortona, Italy
Registered: Jan 2004
|
posted February 07, 2004 08:44 AM
I would agree with Kevin's explanation IF, with the term "loss of loop", Mal claims that the upper loop becomes too big and not too small.
If this is actually the case, since I see no way to fix pressure plate's strength without makeshift solutions, the problem lies very likely with a worn out shutter cam and/or worn out claw arm. The latter indeed rests onto the shutter cam by means of a teflon ball, and is held in place by three springs inside the main mechanism. The ball is very hard and if regularly used/lbricated it should last for long, but in the long term it is supposed to wear. Once this happened the claw is no longer free to move upwards before engaging a new hole in the film and this tends to be tranported back(up)wards for a small fraction of time. IN early stages of the problem a visible jitter is to be experienced on the screen, but when it grows worse, the film may literally jump and lose its loops.
If all this is really the case, the only way to solve the problem is to find a new claw (but better replacing the shutter too); even replacement of the teflon ball only will suffice as it can be removed from the claw arm; it shouldn't be difficult to find: some older bottom of the range Yelco's should have a similar mechanism.
I hope your friend can solve this problem. I'd try to do something personally but I live too far away, and shipping the projector would prolly be less than cost effective.
Regards.
Oh, I was forgetting.
THere is a way to temporarily fix the problem: it consists in shifting the whole shutter about 1/2 mm (no more!!) back on the main shaft. There are three headless screws which hold it in place (sorry I don't know their name in English) you'll need a thin "L"-shaped exagonal tool to unscrew them. This is really worth a try.
--------------------
Maurizio
| IP: Logged
|
|
|
|
|
|
|
|
|
|
|
UBBFriend: Email this page to someone!
Printer-friendly view of this topic
