How do I fix my cd rom?

Popular rumor suggests that SNK made several changes to the CD hardware to end up with the CDZ, most prominent is the rumor that they increased the CD-ROM drive speed from 1x to 2x. The truth of the matter is that the CDZ system was internally identical to the outgoing model, save for the fact that it had a larger amount of internal system memory, creating more temporary storage memory within the system and thus reducing load times by minimizing the need to read from game discs for level information. Despite the reduced load times, they weren't reduced enough to make a notable difference. In addition to this, the console has a design flaw that causes it to overheat after certain periods of time, breaking the console in the process and making it hard to repair.