3guk Posted May 24, 2006 Share Posted May 24, 2006 Just got my 812s out to play and the gobo wheel on one of the lights seems to be 1 step behind, if I send them all the open command, everyone is open apart from this one which is open with a lttle bit of the circle cut off. I turned it off and took off the lense and moved the stepper round and they line up so no problem there, I reset the fixture and the same thing happens. Any ideas?? Link to comment Share on other sites More sharing options...
jayselway Posted May 24, 2006 Share Posted May 24, 2006 Has the end stop become bent at all? Just a thought... Link to comment Share on other sites More sharing options...
Tomo Posted May 24, 2006 Share Posted May 24, 2006 I'd agree it being an endstop alignment issue. Try opening a good one and the bad one, and testing where the gobo wheel hits the endstop on them both. Then fiddle the bad one until it's the same. Link to comment Share on other sites More sharing options...
3guk Posted May 24, 2006 Author Share Posted May 24, 2006 Got a superb reply, just thought I would let anyone else who has this problem know how to fix it. Sounds like a wheel is mis-aligned. If this is the case, the way to fix it is as follows: Power up the fixture and wait till everything resets to its home position. Loosen (but do not remove) the one or two allen socket screws (2.5mm??) on the timing pulley. Without actually making the motor shaft itself move, rotate the wheel on the motor shaft until the circle is lined up properly in the center of the light path. Re-tighten securely (but do not over-tighten) and reset fixture/cycle powerer and check to make sure it still lines up properly. If you go too far one way or the other, the sensor will not line up with the magnet properly, so be cautious. Link to comment Share on other sites More sharing options...
jayselway Posted May 25, 2006 Share Posted May 25, 2006 I've just had a thought - and that is - does the 812 use a hall sensor for the gobo wheel, or an end stop? I only question this cause the quote above mentions magnets - and end stops don't use magnets, unless you have indexable gobos (which are not featured in the 812). If it is an end stop, then the wheel should turn until it hits the end-stop, thus arriving in the right place each time. If the wheel is a fraction of a step out on the motor shaft, then after each reset, it would arrive in between, or just out of a complete gobo - even though it appeared to reset correctly. Also - a timing pulley on a gobo wheel? AFAIK it is mounted directly on the motor shaft. Please correct me if I am wrong - it's a while since I worked on an 812...! Jay Link to comment Share on other sites More sharing options...
Tomo Posted May 25, 2006 Share Posted May 25, 2006 To be honest, I could well be confusing the 812 with the 518.I remember an endstop in one of them... Link to comment Share on other sites More sharing options...
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