The mystery wheel on my cyclone is not working properly. It has an error of 41 when you power up the game. The mystery wheel spins, but it can't figure out its location. Run it in test mode, and it spins fine, but can't locate home. Took it apart and replaced the opto with another opto I had laying around. Still no help. Does exact same thing. Anybody have any advice, or a possible spare part location. Thanks, Beau

Ok............I would say home position was lost by me. How do you know where home position is. I would have lost the home position when I took the mystery wheel off to soder on a new opto. It would seem to me that if the mystery wheel is tight on the shaft and there is no whobble and it spins perfectly fine and the back of the mystery wheel goes through the opto it would be able to locate a home position?

Viper wrk. Tons of good info here. I will test out your theories and repost. Thanks a bunch.

I tried your jumper trick. Disconnected J10 and J8. No trigger when I'm in testing switch edges. Went to pin 9 on J10 and pin 7 on J8. Now you say Q47 needs to be replaced? This is just a baby transistor............what I thought was just a pre-drive transistor. This only needs to be replaced to get the opto to work? I guess what I'm asking is, it's not one of the larger transistors like one of the tip102s is it? Just replace the 2N3904 transistor at Q47? Thanks, Beau

Viperwrrk had the solution. Finally got to replacing the transistor at Q47 today. Wouldn't you know it the opto now works and tests perfect in switch test. Thanks so much for your very helpful information. There were also some slightly discolered/burnt resistors around Q47. I replaced those too while I was at it. Couldn't be happier. Now if somebody would make a comet ramp I'd have a pretty nice Cyclone. Thanks again.