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Author Topic: Eumig 938 Stereo Main Switch
Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 13, 2014 04:21 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Halfway though a reel last night my Eumig 938 Stereo suddenly shut down without warning. At first I thought it was a power failure, or the plug had come loose, but this was not the case. The fact that the shutdown was accompanied by a smell of burnt plastic raised the alarm of a major disaster to my beloved 938. Using a multimeter it quickly became apparent that no voltage was getting to the transformer, and it became obvious that the culprit was that POWER ON-OFF sliding switch. Somehow it had burnt out. Fortunately I have an old Eumig 926GL which I keep for spares for the 938, so I replaced the main power harness from the 938 with the one on the 926. All is now well, and the 938 is back like new.
My question is, does anyone know of a source for that Eumig 900 series power switch? Is it a custom Eumig design, or can it be obtained from electronics suppliers?

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The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Janice Glesser
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Posts: 3407
From: Sunnyvale, CA USA
Registered: Sep 2011


 - posted December 13, 2014 07:46 PM      Profile for Janice Glesser   Email Janice Glesser   Send New Private Message       Edit/Delete Post 
What a great success story Paul! I don't have any info on that part...but really enjoyed reading how you got your beloved projector back running. Kudos my friend!

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Janice

"I'm having a very good day!"
Richard Dreyfuss - Let It Ride (1989).

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Paul Adsett
Film God

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From: USA
Registered: Jun 2003


 - posted December 14, 2014 10:08 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Thanks for the compliment Janice, I am sure that this was a job that you would have had no difficulty with [Smile] .
Actually, IMO those Eumig 900 series power slide switches are a very poor design. Over the years I have had several of them sieze up and refuse to move. I think there must be severe corrosion going on inside the contacts. I am thinking of installing a decent mains switch from Radio Shack, the ones with the built in light, on the rear face of the projector, there seems to be plenty of space inside the machine to do that.
Happy Chistmas Jan, and many good holiday screenings! [Smile]

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 14, 2014 11:53 AM      Profile for Andrew Woodcock         Edit/Delete Post 
Very pleased you got it sorted Paul. I know how fond of this machine you are.Your idea for fitting a modern illuminated mains rocker switch sounds like a very good one to me given the poor build on the original Eumig ones.

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"C'mon Baggy..Get with the beat"

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Paul Adsett
Film God

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From: USA
Registered: Jun 2003


 - posted December 14, 2014 12:14 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Hi Andrew,
Yes I think it will be a pretty easy job. There is sufficient space at the back of the machine to do it, and I think I will just have to drill a single hole thru the aluminum wall behind the transformer.
The 938 is a really great machine, I love mine, but it does not have the tank-like build quality of the GS1200. Eumig skimped on wall thicknesses of some of the plastic components, no doubt to save weight and cost, and I hate having to use a screwdriver to open up the lamp house to clean the gate [Frown] . Why Eumig did not use 2 knurled knobs instead of a screwdriver head is just beyond me.
All showing that even "The Wizards Of Vienna" were not perfect. [Smile]

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 14, 2014 02:18 PM      Profile for Andrew Woodcock         Edit/Delete Post 
I must admit Paul, one of my pet hates on this machine is the need for a straight bladed screwdriver just to access the lamp house!
Perhaps there are a few little mods here and there that this machine could benefit from to make it a little more user friendly, and you are just the guy to do it Paul!

All the top euro models appear to have their quirks, but boy, do they work well once you adjust yourself to mastering these.

Give me Bauer, Eumig 938/40 or Beaulieu every day of the week!

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"C'mon Baggy..Get with the beat"

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Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 16, 2014 01:32 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Sometimes, not very often, when you are trying to fix a projector, you really luck out. In reference to fixing the mains switch on the 938 I have found what I believe to be an almost perfect retrofit sliding switch from Radio Shack. When I say almost, it means that there will need to be a minor modification to the switch, not the projector, which should be easy to do. The new switch looks substantially more robust than the OEM Eumig switch, and it switches very smoothly and very positively. I think it will be a huge improvement to the projector.
I plan on doing this project in the next couple of weeks, and will photo document the process. Stay tuned! [Smile]

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 16, 2014 02:43 PM      Profile for Andrew Woodcock         Edit/Delete Post 
I look forward to seeing the outcome Paul!

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"C'mon Baggy..Get with the beat"

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Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 22, 2014 10:46 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Well I gave up trying to replace the sliding switch, even though I found a close replacement at Radio Shack I could see no easy way to interface it with the sliding mechanical linkage on the 938.
So I decided to take a simpler approach and just replace the slide switch with a rocker switch mounted on the rear face of the projector. I decided to try it out on my old 926 first.

Remove the power harness from the projector. The sliding switch is held by one screw from the inside of the machine, which can be accessed by a long screwdriver:

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There is a space behind the motor and transformer to mount such a switch:

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The wiring is routed between the transformer and motor, and the new connector is soldered and epoxy potted for electrical safety:

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Here is the finished result. I think it looks good and the switch is far superior to the original slide switch.

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--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 22, 2014 10:57 AM      Profile for Andrew Woodcock         Edit/Delete Post 
Good Job Paul! As you Americans like to say [Wink] Ha ha.

Wish I had a pound for every time someone said that to us all whilst we were in training in Mehoopany and Albany GA!

There was even a Motel named Super 8 along Slappey Boulevard back then. Now how cool was that!

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"C'mon Baggy..Get with the beat"

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Steve Klare
Film Guy

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From: Long Island, NY, USA
Registered: Jun 2003


 - posted December 22, 2014 11:29 AM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
It is nice work: if I bought a machine and it showed up like this it might take me a while to realize it didn't leave the factory this way!

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All I ask is a wide screen and a projector to light her by...

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Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 22, 2014 01:29 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Thanks Guy's. As you know, it is very satisfying to repair a projector and bring it back to a fully workable machine. In this case, as I said above, I stole the harness out of the 926 when the sliding switch on my 938 failed. This left the 926 as a 'dead' machine, but now it is back to full working condition. The challenge of totally incorporating a replacement sliding switch into the Eumig's original position, and interfacing with the mechanical interlock mechanism remains a challenge for the future! In the meantime though, I really like that rocker switch, and it does look and feel right at home on the 926.

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--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Kevin Hassall
Master Film Handler

Posts: 438
From: Walsall, England
Registered: Dec 2010


 - posted December 22, 2014 02:26 PM      Profile for Kevin Hassall   Author's Homepage   Email Kevin Hassall   Send New Private Message       Edit/Delete Post 
Hiya paul are the 926 machines gud ?

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 22, 2014 02:59 PM      Profile for Andrew Woodcock         Edit/Delete Post 
As no doubt Paul will confirm, these projectors share the same great sound of the 938/40 models Kevin, but the Achilles heel on these is the awful coaxial reel arrangement. Really only any use up to 400ft reels max despite their apparent 600ft capacity.Also only 100w light output through a very average lens as standard. So imho ok as re-record machine apart from the temperamental friction drive, but not a showman's projector by any means Kevin.

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"C'mon Baggy..Get with the beat"

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Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 22, 2014 03:54 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Andrew has hit the weak points of the 926GL Stereo. An otherwise superb machine marred by two very bad decisions by the Eumig designers (or perhaps more likely, their marketing bean counters):
1. The coaxial reel arrangement, which is a pain to thread up as the take up reel is blocked by the supply reel. And the film has to go though a sideways displacement and twist before it enters the gate.

2. No feed sprocket. That's right, Eumig elected to do away with a feed sprocket on the 900 to 929 series machines. And you would never know it from the picture on the screen, which is absolutely rock steady - as long as you do not go bigger than a 400ft supply reel. If you try to run a 600ft reel, the film will jerk off the supply spool and noisly thrash around somewhere between 500 and 600ft, and the picture will become very unsteady and start slipping in the gate.
Despite all this, I have never scratched a frame of film on a 926.
The 'Optical Levelling' system works great, but the lens quality is poor, lacking contrast.

On the plus side, the sound mechanics and stereo electronics are just superb, and you can get really stunning mono and stereo from these machines. So as Andrew correctly point out, they make great recording machines, particularly with the comprehensive mixing controls which are far better and easier to use than the GS1200.

So the 926GL really is a mixed bag. I can certainly recommend it though for use up to 400ft reels, if you can find a better lens.
All the faults of the 926 were corrected on the later models, which reverted to a conventional 2-sprocket in-line film path. The top of the line 938 and 940 had 800 ft spool capacity and 150 watt lighting.

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--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 22, 2014 04:22 PM      Profile for Andrew Woodcock         Edit/Delete Post 
Ironically Paul, one of my favourite manufacturers, Bauer, made very similar mistakes with their mag/ optical model the 192. Had this machine had a top sprocket and 800ft reel capacity, with its 150w lamp and superb f1.1 lens available to fit into it, it would have been a winner for optical prints I feel.

Very few manufacturers seemingly thought of everything that the end user would ever want from their next projector investment back then in 78. If the video era had only taken its grip a few years later, I feel the GS1200 would have truly been given a run for its money by many other manufacturers as so many of them were just beginning to realize what makes an almost perfect Super 8 projector.

Now if only...

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"C'mon Baggy..Get with the beat"

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Graham Ritchie
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From: New Zealand
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 - posted December 22, 2014 05:28 PM      Profile for Graham Ritchie   Email Graham Ritchie   Send New Private Message       Edit/Delete Post 
Well done Paul...that looks good. What I have found when things burn out, is that its usually down to a build up of resistance on the switch contacts due to nothing more than "old age" and as a result warm up like a heater element then in time burn out.

Your new switch [Cool] will last forever [Smile]

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Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 22, 2014 08:03 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Andrew, I feel that the omission of the feed sprocket is by far the greatest sin on the 926GL. The coaxial reel arrangement, although a nuisance, a bit strange, and a totally unnecessary arrangement, is not in any way responsible for the inability of the 926GL to be able to smoothly handle large spools. That all comes down to no top sprocket, and had there been one the coaxial arrangement would have been as smooth running as any conventional in-line reel arrangement. A top sprocket would have made all the difference on this machine.

quote:
Your new switch will last forever

Or at least Graham until the sound head wears out! [Big Grin]

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Osi Osgood
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Registered: Jul 2005


 - posted December 24, 2014 11:41 AM      Profile for Osi Osgood   Author's Homepage   Email Osi Osgood   Send New Private Message       Edit/Delete Post 
Your dedication to this hobby (and you're EUMIG'S!) is so note-worthy and certainly becoming legendary!

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"All these moments will be lost in time, just like ... tears, in the rain. "

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 24, 2014 12:38 PM      Profile for Andrew Woodcock         Edit/Delete Post 
There's not TOO many 600ft capacity projectors that I have seen that DO have a top sprocket, sadly Paul.

It would appear most manufacturers deemed it unnecessary, but it sure would have made them a whole lot better, even if at the expense of a little extra on the price tag.

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"C'mon Baggy..Get with the beat"

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Paul Adsett
Film God

Posts: 4917
From: USA
Registered: Jun 2003


 - posted December 24, 2014 02:24 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Yes I totally agree Andrew. It is hard to believe that elimination of a top feed sprocket (and its associated gearing) would save a significant amount of money to the manufacturer. I have yet to see a sprocketless projector that is not really fussy about the mechanical properties of the film (thickness, flexibility, and friction) as well as reel size. A classic example is the Pathe Super Baby and Pathe Ace, both totally sprocketless projector, but one which Pathe had to use flapping rollers with brake arms on both the feed spool and take up spool, in order for it to be able to take decent sized reels. Even with these features, the Baby and Ace claws will often skip frames as the reels tug on the film. All of which could have been avoided by two simple sprockets geared to the drive shaft.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 24, 2014 03:03 PM      Profile for Andrew Woodcock         Edit/Delete Post 
The best top sprocketless machine I have ever used is the Agfa LS. You would honestly never know it doesn't have one. Good all the way to the fullest of 600ft reels. Not found another like it though.

I believe the Fuji SD Auto is an excellent smaller projector as well though. Having never had one, I don't know whether or not it has a top sprocket or not. No doubt someone will enlighten me?

[ December 24, 2014, 04:12 PM: Message edited by: Andrew Woodcock ]

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"C'mon Baggy..Get with the beat"

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Kevin Hassall
Master Film Handler

Posts: 438
From: Walsall, England
Registered: Dec 2010


 - posted December 25, 2014 06:54 AM      Profile for Kevin Hassall   Author's Homepage   Email Kevin Hassall   Send New Private Message       Edit/Delete Post 
Such a shame it looks s superb machine my friend has one and he said i cud have it he said all it neads is servicing

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Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012


 - posted December 25, 2014 10:27 AM      Profile for Andrew Woodcock         Edit/Delete Post 
Keep it for spares for your two 938's Kevin. The mixer desk,sound head and stereo amplifier is identical, so many useful parts I would imagine depending what's wrong with the 926 already.

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"C'mon Baggy..Get with the beat"

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Kevin Hassall
Master Film Handler

Posts: 438
From: Walsall, England
Registered: Dec 2010


 - posted December 25, 2014 11:14 AM      Profile for Kevin Hassall   Author's Homepage   Email Kevin Hassall   Send New Private Message       Edit/Delete Post 
Such a shame it looks s superb machine my friend has one and he said i cud have it he said all it neads is servicing

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