Neo Geo CD My Annoying CDZ-Fixed (maybe?)

My CDZ has this annoying problem where it won't play two of my disks that are higher megs. I think I have narrowed down the problem to either dust (doubtful) or lazer alignment. Whenever I take a knife or a q-tip, and adjust the lazer so it sits higher and more centered, the disks will play. Just thought I would share.

I am going to keep this thread updated because I know it will help someone out who has these problems. I am beginning to think that the problem is not the lazer afterall. I have narrowed it down to being possibly one of two things. The heat in the system itself, or dust. Adjusting the lazer today did nothing. This time I used a q-tip to clean the system with isopropyl alchohol, and then took a hair dryer on cool and held it to the inside of the system letting it blow directly inside. This allowed KOF 98 to boot up.

I think it might be the heat due to one thing that happened today that has not happened yet, after awhile of playing KOF 98, I got a disk i/0 error.

Its possible that since I am using a japanese power supply in an American socket that the system is generating too much heat. A step-down might help, but where do I get a step-down?