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Topic: Elmo ST-1200: new belt and spring but speed & sound issues
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Akshay Nanjangud
Jedi Master Film Handler
Posts: 637
From: Dallas, TX
Registered: Nov 2011
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posted January 06, 2012 10:43 PM
Hi guys,
I got myself this Elmo ST-1200 yesterday.
Users of this projector should identify this shroud (?) that covers the lamp. The glass, as the picture shows, is cracked. Can I buy this glass somewhere? If I can't, can I do without it?
My ST-1200 seems to have only one belt. On touching, it leaves light black marks. It seems to have lost elasticity. This obviously need replacing. What confuses me is the eBay seems to sell 3, 4 and 5 belt sets. Can someone please explain why?
Finally, the drive pulleys don't seem to touch the shutter. In picture, the pulleys A and B don't make contact with the Shutter(?) for any 18 or 24 fps. Is this how it should be? Will a tight new belt establish contact?
Please help.
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frank arnstein
Jedi Master Film Handler
Posts: 534
From: Gold Coast. Australia
Registered: Jan 2005
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posted January 07, 2012 04:34 AM
Yes, seems to have covered it all,,,, yet, from the picture, there appears to be a very important extension spring missing from your projector. It provides the pressure needed to keep the rubber drive rollers against the shutter edge. Without that spring, No Drive. Near the arrow A is a hole where the top end of the spring should be in. The hole for the other end is some where behind. Get a few extension springs and see if you can fit one that will give the right amount of tension for the friction drive to work ok. You might even find the old spring fallen in behind the works.
Let us know how you go after fitting belts and a spring.
dogtor ![[Wink]](wink.gif)
[ January 10, 2012, 12:28 AM: Message edited by: frank arnstein ]
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At Projector Heaven the Focus is always on Detail.
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[o:/o]<|=- dogtor@projectorheaven.com.au
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Akshay Nanjangud
Jedi Master Film Handler
Posts: 637
From: Dallas, TX
Registered: Nov 2011
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posted January 07, 2012 05:15 PM
So, I got an O Ring seal for the drive (as Graham suggested, I like this for now) and a spring. The first few minutes the projector ran beautifully. The sound was superb too, as good as if not better than my Bolex SP-80. Life was good. If you don't believe me, take a look at the pic. ![[Smile]](smile.gif)
First, the sound disappeared. I unscrewed and re-screwed the back cover several times but sound seems to have deserted me. Now the sound doesn't even start on re-threading.
Next, the ST-1200 started running slow. This happens when I turn the switch to F.
Does anyone have ideas?
[ January 08, 2012, 04:02 PM: Message edited by: Akshay Nanjangud ]
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Steve Klare
Film Guy
Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003
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posted January 10, 2012 03:17 PM
Hi Akshay,
The ST-1200's biggest weakness is speed regulation. Mine will mosey up to 24FPS eventually, but it takes a while. I usually let it warm up before I project anything, and even then the sound runs a little bassy for the first 30 seconds or so.
Other than that you should make sure that the new belt you just put on is not too tight (or too loose). Adjust the idler pulley around and see if that speeds things up. (Be careful: there are dangerous voltages exposed with the cover off!)
There are loads of ways of losing sound.
1) Film not pressed down on the heads.
2) Bad connection between heads and sound circuit.
3) Bad connection between sound circuit and speaker.
4) Oxidation on contacts
5) Dead semiconductors in the sound circuit.
6) Loss of input power to the sound circuit
7) Dead speaker.
8) Selective deafness. (It's the reason my wife occasionally "loses sound". )
(etc., etc.,...)
When you turn the sound on, what do you hear?
-nothing?
-hum that changes with volume?
If there is some hum then when you run a film if you crank the volume is there just the hint of soundtrack there?
Do you hear anything if you plug headphones in?
The standard thing is to work the switches and jacks hoping to break some oxide, but being that you had sound recently this may not apply (no harm trying...)
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All I ask is a wide screen and a projector to light her by...
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