opt fault

[mike43]

Hi i have just got hold of a hi lo casino fruit machine by global. Everything was fine for a week or so and then i changed the percentage settings (it was set at 98%) after this change i keep getting opt fault reel 3. I have tried changing it back but it still has the fault. i have also tried changing the looms over between reels 3 and 4 which works but when changed back into original position comes up with the fault again. This however does not do it all the time and sometimes its fine and i can play as normal. I am new to this and if anyone could shed some light i would be very grateful.

[wildcat]

sounds like the tab on the reel, there will be a small tab that passes a sensor, make sure its going through the sensor without touching it