8mm Forum: GS1200 Microswitches

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Topic: GS1200 Microswitches

Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted March 08, 2009 05:54 PM

Here we go again! I had to replace the rear auto thread release microswitch on my GS1200 Version 2 today. One thing I have found out is that testing these switches with an ohmeter or continuity meter means nothing. When I took the old switch out and tested it, it was making contact just fine. Replacing it with a new switch totally solved the auto thread release problem, which now snaps back very sharply and without hesitation. This is not the first time I have seen these switches behave this way,so I conclude that somehow these switches lose their ability to carry sufficient current to the release solenoid, even though they are apparently making contact. Very strange! [Confused]

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Roy Neil
Expert Film Handler

Posts: 203
From: Menlo Park, CA
Registered: Sep 2007

posted March 09, 2009 06:22 AM

That sounds like a mechanical vs electrical issue. Perhaps the switch was not 'fully' engaging due to wear, especially if the electrical contacts are still functioning properly.

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