8mm Forum: ELMO ST-1200D - Green threading switch is locked all the time

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Topic: ELMO ST-1200D - Green threading switch is locked all the time

Christian Schatz
Film Handler

Posts: 57
From: Germany
Registered: Feb 2012

posted December 30, 2012 08:48 PM

Hello,

the next problem on my Elmo. I hope someone can help me with a workaround.
Since today the green threading switch on the front is stuck down all the time.
The black release switch at the back has no function anymore.
I opened the backplate and had a look at the solenoid switch for the front green
switch. If i push the solenoid switch back, the green front switch releases.
But it doesn't release automatically ...

What is the problem and how can i fit it? [Confused]

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KINOTON FP30D w/ 1kW Xenon & FP30 w/ 1.6kW Xenon
BAUER SONOLUX II w/ 36V/400W Halogen
CARL ZEISS TK35/52 w/ 36V/400W Halogen
ELMO ST-1200D M&O 24V/250W Mod with Schneider Lens 1.1 / 11-25

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Steve Klare
Film Guy

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

posted December 30, 2012 09:28 PM

Are you good with electronics?

Sounds like either the solenoid is dead or the voltage that's supposed to make it move is absent.

The best thing to do is hang a voltmeter across the solenoid coil terminals, push the button and see what happens to the meter reading. If it goes up when you press the button it's probably the solenoid. If it's always zero it's something else (wiring, connection, switch contacts...)

Measure this on both AC and DC scales, I'm not sure which this one is...(I'm guessing AC)

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

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Dino Everette
Phenomenal Film Handler

Posts: 1535
From: Long Beach, CA USA
Registered: Dec 2008

posted December 30, 2012 11:30 PM

Christian, also check the button, as i had a sticky button one time..

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"You're too Far Out Miss Lawrence"

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Christian Schatz
Film Handler

Posts: 57
From: Germany
Registered: Feb 2012

posted December 31, 2012 08:03 AM

Hello,

the voltmeter was reading something when i pushed the button. I checked the wiring
(blue and red cable) and found a loose connection at the contact switch. I soldered
the blue cable and now the automatic threading works flawless again. I think it
was a bad solder point. I thank you for your help! If i had looked more precisely
at the issue, i didn't had to bother you with such things. [Wink]

But be aware ... the next problem where i need your help is coming surely! [Wink]

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