I found this place in looking for into to fix up my Sega CD and Sega CDX here and was able to fix up the Sega CD.

But I still cant get my Sega CDX to work. It plays Genesis games fine and it even spins up Sega CD games and the laser does move up and down, but the laser doesn't move along the tray at all. I think that the tracking motor is dead or jammed somehow, but I can't find a replacement motor for it. Any help would be appreciated.