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Topic: GS1200 Speed Control
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Graham Ritchie
Film God
Posts: 4001
From: New Zealand
Registered: Feb 2006
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posted December 10, 2007 02:10 AM
Hi Kev Fixed ....the reason, I dont no, last Friday I prodded all over the place with the multi-meter in particular checking continuity between the left pot and the ESS and speed selector switches, everything seemed fine including all the connectors at the back of the board, I checked everything you mentioned. I gave up at this point and left the projector at work, told the weekend projectionist he was welcome to give it a go { he has just completed an electronics course} just the thing to put some of that theory to work, anyway got a call the next day the projector is running fine switched it on and it worked, although I am happy with the result it does not answer "the why" so today I again removed the rear board and sprayed a small amount of CRC2-26 into both the switches its supposed to improve electrical properties, penetrates and most importantly lubricates, as the CRC contact cleaner I had used earlier had removed any lubricant that was originally inside both switches, and as a result made the switches hard to move, using CRC2-26 did the trick, with a final clean with contact cleaner over the entire bottom board including all the connectors, what a story eh!, well I ran the projector constant for 8 hours today at both 18fps and 24fps, tried to make it fail, it ran with no problems, thank goodness.
I can only guess that the prodding on Friday might have done something, a loose connection or a poor joint somewhere, I dont no, also the grease used on the switches may have dried hard over the years, causing a poor contact its all guess work, one thing is for certain most mechanical/electrical components need to be used and the GS1200 does not like to sit around and gather dust so this machine is going to get a lot more use its been an interesting experience.
Graham.
PS. Just a word of caution to anyone out there who is thinking of using elecrtical cleaners, there are some that effect certain types of plastic and some that are flammable so be carefull what you use.
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