Author
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Topic: GS1200 Rewind
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted April 07, 2019 12:36 PM
Well never a dull moment with the GS1200! Yesterday I was rewinding a film on the GS when suddenly the rewind slowed down and came to a slow crawl. All the symptoms of aa burned out motor. I took the motor apart and inspected the commutator and windings and I could not see any damage like burned windings. I also re-cleaned the commutator and brushes(which I had done about a year ago) and re=assembled. I engaged the re-wind again and got the same slow crawl. Then I swiched to forward projection and observed that the motor was spinning normally (it runs during normal projection along with the rear take-up motor). This told me that the motor was OK, but it was not getting the proper voltage during re-wind. So it must be a circuit problem. No, it turns out to be a switch problem, namely the two micro switches that are activated when you pull on the re-wind knob. When I pushed on these by hand the rewind spun up normally with plenty of torque. So I continued to activate the micro switches on and off by hand and the problem has now gone away and rewid activation by pulling on the yellow slide bar is now normal. A case of dirty or oxidized contacts inside those micro-switches. If it happens again I will go in and replace these switches which should be a relatively easy job. These micro switches seem to be all over the GS, controlling auto threading, lamp, rewind, and solenoids. In my experience they cause 90% of the problems I have encountered on my two GS1200's, and owners should expect that some of them are going to need periodic replacement.
-------------------- 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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