8mm Forum: GS1200 - something working loose?

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Topic: GS1200 - something working loose?

Adrian Winchester
Film God

Posts: 2941
From: Croydon, London, UK
Registered: Aug 2004

posted December 30, 2012 02:39 PM

When using my GS1200 last night, it immediately sounded a bit noisy in comparison to how it usually sounds, and within a few minutes, the picture developed vertical unsteadiness. I was presenting a show for 15 people, so I stopped the film and got out another projector. I'm hoping that the problem simply comes down to something working loose that I can tighten up, but if anyone could the way to a possible cause, I'd be grateful.

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Adrian Winchester

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Hugh Thompson Scott
Film God

Posts: 3063
From: Gt. Clifton,Cumbria,England
Registered: Jan 2012

posted December 30, 2012 03:00 PM

Hi Adrian, have you been intouch with Bill Parsons, as I would
think he might have an idea as to what the problem is.

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Vidar Olavesen
Film God

Posts: 2232
From: Sarpsborg, Norway
Registered: Nov 2012

posted December 30, 2012 03:47 PM

You mean jumpy pictures? My ST-1200D MO did that when the feed system didn't release. Happened only when I used 1200' reel.

Didn't matter ow many times I pressed the loop mech. I would at least check to see if feeder releases

Good luck

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Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted December 30, 2012 06:14 PM

Adrian, try replacing the main drive belt. And poke some molybdenum grease onto the surface of the shuttle cam using a plastic or wooden stick.

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Hugh Thompson Scott
Film God

Posts: 3063
From: Gt. Clifton,Cumbria,England
Registered: Jan 2012

posted December 30, 2012 06:19 PM

I take it that you've checked the side pressure plates Adrian,that
one of the little retaining screws hasn't come out.Check also the spring on the other side.Are they OK for wear? Or is it possible
that the gate Back Plate isn't secure,as you know the slightest
movement out of true would produce a similar fault.There might
even be a stray piece of film lodged or foreign body around the
shutter/claw.Failing that, Bill is the man.

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Adrian Winchester
Film God

Posts: 2941
From: Croydon, London, UK
Registered: Aug 2004

posted December 30, 2012 06:33 PM

Many thanks gentlemen for the suggestions - I'll investigate, keeping these points in mind, and report back any progress. I'm aware of Bill's expertise and it's a projector he has fixed previously, as well as installing a 2 bladed shutter into. I opted not to approach him first in this instance partly because I'm sure he gets a lots of such queries, but also because if it's a simple matter that proves easy to fix, the information might prove helpful to someone else in future who has the same problem.

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Adrian Winchester

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Adrian Winchester
Film God

Posts: 2941
From: Croydon, London, UK
Registered: Aug 2004

posted January 06, 2013 01:43 PM

In case someone finds they have the same problem, I'll report that I think I have found the cause: a small, broken spring that's located (if you are looking at the back) about 1 cm to the left of the shutter, a bit higher than the centre of the shutter and mounted horizontally. I'm afraid I don't know what it does or exactly what it's connected to but it seems at the heart of the added noise, and close to parts that could cause an unsteady picture. It will be quite tricky to get a replacement in position but I'll have a go when I have (hopefully) found a similar small, sturdy spring, no more than 4mm diameter as I don't suppose I have much chance of getting the right Elmo spare!

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Adrian Winchester

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