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Author Topic: Elmo K100 variable speed problem
David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted October 28, 2018 05:30 PM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
I have an Elmo K 100 SM that keeps changing speed on its own. I use it strictly for film transfers and this is a real problem to capture without getting flickering on the screen! Is this just the way this projector runs or is something else going on. I don’t remember having this problem when I first bought it two years ago.
Any help greatly appreciated!

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Leon Norris
Jedi Master Film Handler

Posts: 593
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted October 28, 2018 07:15 PM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
I fix all Elmo super 8 projectors. Mainly sound. I think it could be the motor or the v belt (runs main motor ) . I still have some parts for this machine. So check it out and let me know!
Thanks Leon Norris

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David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted October 28, 2018 07:43 PM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
Thanks for the quick reply! The unit runs quietly with no apparent motor noise but can it be bad and still sound ok? You also mentioned a “v belt”. Is there just one of them? Thanks.

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Nantawat Kittiwarakul
Expert Film Handler

Posts: 219
From: Rajburana, Bangkok, Thailand
Registered: Aug 2017


 - posted October 28, 2018 08:13 PM      Profile for Nantawat Kittiwarakul   Email Nantawat Kittiwarakul   Send New Private Message       Edit/Delete Post 
Or maybe it's the speed regulator circuit itself that's about to fail? [Confused]

But since it is usually of a plain simple design with just a regulator transistor and that's about it. So you can't expect any speed accuracy anyway. [Razz]

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Just a lone collector from a faraway land...

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Janice Glesser
Film Goddess

Posts: 3301
From: Sunnyvale, CA USA
Registered: Sep 2011


 - posted October 29, 2018 02:48 AM      Profile for Janice Glesser   Email Janice Glesser   Send New Private Message       Edit/Delete Post 
If the motor seems to be running ok and all the belts look good...then I concur with Nantawat and would look at the board controling the variable speed rheostat. I would remove the small PC board and check to see if that large cap is good.Also check that the solder joints are good and any wiring that might be loose.

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Janice

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

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David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted October 29, 2018 06:59 PM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
If the rheostat control bad is bad, is it possible to eliminate it and replace it with an “aftermarket “ controller?

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Nantawat Kittiwarakul
Expert Film Handler

Posts: 219
From: Rajburana, Bangkok, Thailand
Registered: Aug 2017


 - posted October 29, 2018 08:48 PM      Profile for Nantawat Kittiwarakul   Email Nantawat Kittiwarakul   Send New Private Message       Edit/Delete Post 
Speaking about capacitors...

I recently acquired this "as is" Ricoh S8 sound projector dirt cheap (about 33$ include shipping). Upon arrival I've found it to be TOTALLY DEAD,no life signs at all. [Frown]

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After assuring that the motor itself and the transformer is fine I dive down to its main power board,realized it to be those faulty bunch of capacitors (around the right side of the pic) that are totally dead.

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After replacing them it comes back to life again [Smile] (the amplifier section is still dead however,gonna check it out later).

Polt twist : and I'm careless enough to accidentally short-out its regulator transistor,making it now always running at full power regardless of the speed settings. [Eek!] The replacement transistor is still on the way,so it's being "shelved",at least for now.

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Just a lone collector from a faraway land...

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David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted December 11, 2018 12:54 AM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
I have very limited testing equipment but I hope someone can help me. Last night, I tested the voltage on the capacitor after turning the unit on and it showed 80 volts. (This is the capacitor on the variable speed controller) Today,I tested the voltage on the main capacitor and it showed about half (40 volts) of what it showed the night before. This is after letting it sit overnight. Is this normal or is this possibly the reason for my erratic speed problem?

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Leon Norris
Jedi Master Film Handler

Posts: 593
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted December 11, 2018 11:59 AM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
David, Does the speed switch work? 18-24 fps. Does the variable speed control work? You said the speed fluxes. Try spraying the speed switch and speed control. With tuner cleaner with lubercant. Your speed area could be dirty? Let me know! I still have some parts for this machine! Leon Norris.

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Nantawat Kittiwarakul
Expert Film Handler

Posts: 219
From: Rajburana, Bangkok, Thailand
Registered: Aug 2017


 - posted December 11, 2018 07:38 PM      Profile for Nantawat Kittiwarakul   Email Nantawat Kittiwarakul   Send New Private Message       Edit/Delete Post 
Hmmm this seems more complicated than I thought. [Roll Eyes]
It might be then necessary to check it throughout the entire path - starting from the transformer to the motor itself.

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Just a lone collector from a faraway land...

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David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted December 11, 2018 07:42 PM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
Thanks Leon! I’ll pick up some cleaner and give it a try! I’ll let you know how it goes!

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Janice Glesser
Film Goddess

Posts: 3301
From: Sunnyvale, CA USA
Registered: Sep 2011


 - posted December 11, 2018 09:56 PM      Profile for Janice Glesser   Email Janice Glesser   Send New Private Message       Edit/Delete Post 
Dave I would remove the capacitor and check it with a capacitor meter or some voltmeters will measure capacitance. You will need an ESR meter to check it in-circuit. After a few years the resistance can rise on these caps lowering the capacitance...they can look good...but they are not.

--------------------
Janice

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

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David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted December 11, 2018 10:47 PM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
Thanks Janice! I just bought a new capacitor online.

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Leon Norris
Jedi Master Film Handler

Posts: 593
From: Elkins Park, PA, USA
Registered: Jun 2012


 - posted December 13, 2018 09:37 AM      Profile for Leon Norris   Email Leon Norris   Send New Private Message       Edit/Delete Post 
David, just to let you know that its a common problem with this Elmo k100 projector. The Elmo k110 sm is a better choice! The k100 always had speed problems! Good Luck! Leon Norris.

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David Ervin
Junior
Posts: 7
From: Schererville, IN, USA
Registered: Jun 2015


 - posted December 16, 2018 12:59 AM      Profile for David Ervin   Author's Homepage   Email David Ervin   Send New Private Message       Edit/Delete Post 
Leon, pardon my ignorance but where is the speed switch? I know how to control the “variable speed knob” but not sure about the 18/24 switch?

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Janice Glesser
Film Goddess

Posts: 3301
From: Sunnyvale, CA USA
Registered: Sep 2011


 - posted December 16, 2018 08:58 AM      Profile for Janice Glesser   Email Janice Glesser   Send New Private Message       Edit/Delete Post 
David, Leon might be referring to another model projector. There is no 18 / 24 switch on the Elmo k100. It has a rheostat speed controller and it is a silent projector. Most sound machines have a 18 / 24 switch.

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Janice

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

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