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Author Topic: GS1200 Puzzle
Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003


 - posted November 08, 2019 11:05 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
I have two GS1200's, a version one and a version 2, both acquired off ebay. I have noted that my version 1 machine has an extra circuit board which is not present in the later version 2 machine. This board is located next to the motor governor board and close to the back ESS panel.It sticks up vertically and is held by a single screw bolted to the metal bracket on the main control board. The question is what is it, what does it do, is this an Elmo board that was present in all version 1 machines, or is it some kind of add-on by the previous owner of the machine? Is it perhaps some kind of syc-pulse device?

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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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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003


 - posted November 08, 2019 11:16 AM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
Oh, that's vector board.

-same stuff I use for my own mad-science projects!

The fun part of it is I have no real feel for how much room a circuit will take by the time I build it and then fix the problems, so I build on a big piece, find a case it will fit inside and just lop off the spare real estate when I'm done.

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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: 5003
From: USA
Registered: Jun 2003


 - posted November 08, 2019 11:21 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Yes that is the regular motor board that is present in both versions of the GS1200. Its the other board, the one sticking up vertically, that I am questioning.

--------------------
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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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003


 - posted November 08, 2019 11:25 AM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
Sorry, Paul!

I first recognized the motor control and then re-edited when I realized what you were really talking about!

Interesting how the mounting brackets look like bare aluminum, but all of Elmo's sheet metal parts look plated.

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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: 5003
From: USA
Registered: Jun 2003


 - posted November 08, 2019 11:32 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
I think your correct Steve, the more I look at it the less it seems like a production item! [Big Grin]
Whatever it is, it does not affect the normal running of the machine.

--------------------
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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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003


 - posted November 08, 2019 11:39 AM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
I can't see where it connects to anything else!

(Does it?)

This could be someone's great idea that just didn't pan out! (I have several of these assemblies of my own! Every so often I need a part...)

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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: 5003
From: USA
Registered: Jun 2003


 - posted November 08, 2019 12:03 PM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
It connects over to the pulse input socket on the back of the machine so I'm beginning to think that it might be something like a built-in Pedro or Renzo box, for synching to a DVD player. Or maybe it is a built-in pulse generator. But I have no idea how to use it.

--------------------
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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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015


 - posted November 09, 2019 04:06 AM      Profile for Phil Murat   Email Phil Murat   Send New Private Message       Edit/Delete Post 
Hi Paul,
This prototype board showing few components could be a small signal amplifier as well (10k trimmer is gain adjustment in this case)
I don't think this is a signal generator, however to be confirm.
How is powered this board ?

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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017


 - posted November 10, 2019 11:36 AM      Profile for Thomas Knappstein   Email Thomas Knappstein   Send New Private Message       Edit/Delete Post 
Hi Paul!
Pic this Board out of the Machine and make a better
Photo of all Parts on it.

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003


 - posted November 10, 2019 01:00 PM      Profile for Steve Klare   Email Steve Klare   Send New Private Message       Edit/Delete Post 
I'm up to two (maybe three) small transistors, a bunch of resistors, some capacitors and a big potentiometer!

Whatever it does, it's pretty simple.

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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: 5003
From: USA
Registered: Jun 2003


 - posted November 13, 2019 10:01 AM      Profile for Paul Adsett     Send New Private Message       Edit/Delete Post 
Here is a close up picture showing all the components on the board. All the wires from the board connect to the ESS/PULSE REC DIN socket on the back panel of the projector:

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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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Thomas Knappstein
Expert Film Handler

Posts: 124
From: Erwitte, Germany
Registered: Oct 2017


 - posted November 13, 2019 10:48 AM      Profile for Thomas Knappstein   Email Thomas Knappstein   Send New Private Message       Edit/Delete Post 
Perhaps it could change a Fbas Video Signal to a TTL Impulse for driving the GS directly with a DVD Player or VHS Recorder.

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