I'm not sure if I'm missing something but I've replaced lasers in plenty of other consoles, Saturns, PS2 Slims, even the X'Eye but for some reason I cannot get a Model 1 Sega CD to work right. I got one that freezes on the Sonic Sega screen & won't play any games EXCEPT Sega Classics but I know it isn't working right with that because it stutters. I've tried several replacement lasers, adjusting the pots, & replacing the belt just to be sure. Nothing.