My assumption is that it is for the motor and fixture reset commands.
Channel 7 or 8 depending on mode: 80-84 All Motor Reset 85-87 Scanner Motor Reset 88-90 Color Wheel Motor Reset 91-93 Gobo Wheel Motor Reset 94-96 Shutter/Dimmer Motor Reset
Sometimes the fixture just get out of whack and simply needs to have the motors reset. It is pretty common practice during long shows to reset the lights a few times depending on length. I will often reset all movers during intermission or during a long period of time when I am not using them. Just one of those things that helps keep things consistent.
You would have to refer to the Accu Spot 250 user manual on what the reset options do. or hover over the reset button with the mouse and it may tell you more info. like. reset all, reset color or reset gobo.
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