8mm Forum: ST 1200 Problems

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Topic: ST 1200 Problems

Graham Sinden
Phenomenal Film Handler

Posts: 1131
From: Kent, UK
Registered: Aug 2005

posted November 24, 2005 07:12 AM

Hello,
A friend of mine had a Elmo ST1200 HD which hadn't been used for some considerable time. When we switched it on for the first time we noticed that the main motor belt was streched so we obtained a new belt from CHC and last night I put it on carefully. When we tried it everything seemed to work ok but after about 15 minutes the machine came to a halt. After taking the back cover off we noticed that the rubber around the shutter wheel had gone all sticky and softened with the heat of the bulb and this was sticking to the other two rubber wheels.

However, just for interest, we opened up my friends other ST1200 D and there was no rubber around the shutter wheel. i.e. the two rubber wheels just presssed against the bare metal of the shutter wheel.

Therefore do I..

1. Replace the rubber around the shutter wheel.

or

2. Scrape off the sticky rubber with a flat screwdriver and clean off the rest. Then adjust the position of the other wheels.

Thank you, I hope someone can help

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted November 24, 2005 11:20 AM

If I were you, I'd do step 2. for sure, then optionally step 1. [Wink]

If you do decide to just clean off the remains of the shutter belt, no adjustment will be needed to the rubber rollers - but be aware that the projector will then run slightly faster because the diameter of the shutter wheel sans belt is a tiny bit smaller and so it will rotate faster.
If you do put on a new belt, it will require some tricky handling - actually you're supposed to remove the entire shutter wheel assembly which can be a frightening step, but I was able to put the belt on with everything still in place. It's just very tricky to do and requires patience.
Whatever you do, good luck! [Smile]

--------------------
Call me Phoenix. *dusts off the ashes*

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Graham Sinden
Phenomenal Film Handler

Posts: 1131
From: Kent, UK
Registered: Aug 2005

posted November 25, 2005 07:10 AM

Thanks for that advice. I was thinking to just get rid of the rubber arount the wheel and clean it off until it is shiny and smooth like the other projector. I will have to check my own ST1200 HD to see if there is any rubber around that, but I have never had this problem with it and have run 1200" reels through it loads of times without any hiccups.

I did think about the speed factor but I feel the difference will be so small its not worth bothering about.

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John Clancy
Phenomenal Film Handler

Posts: 1954
From: Cornwall
Registered: Jun 2003

posted November 25, 2005 08:20 AM

Graham do a search within this forum for the very subject you are talking about. It has had threads numerous times and one member, Tom Photiou even got the part you are talking about remanufactured (assuming I'm reading your post correctly of course and bearing in mind I know nothing about ST1200's).

--------------------
British Film Collectors Convention home page www.bfcc.biz. The site is for the whole of the film collecting hobby and not just the BFCC.

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Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted November 26, 2005 09:42 AM

You must be so careful removing the rubber around the shutter, The metal is very soft and easy to damage and/or indent. If you damage it you may end up with quite a vibration.

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted November 26, 2005 05:10 PM

Tom is correct with what he says. The metal is very soft indeed and will mark very easily. What I did with one of my ST's was to use paint stripper on about an 1" at a time and then used a piece of plastic to remove the now soft rubber off the shutter. Once this was done I spun the shutter by hand and then used some wet&dry paper to clean any remaining rubber off the surface and leave it with a slight rough finish to give a better grip for the rubber rollers.
The speed diff will be hardly noticeable so I wouldnt worry about it.

Kev.

--------------------
GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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