The Powerful Playstation 2 Repair Guide
The remaining checks will require that the PS2 cover be removed. Follow these steps to safely and easily remove it.
Remove all the screw covers. (There should be 6 screw covers, 4 made of rubber (outer edges) and 2 made of plastic (in the middle), that need to be removed. You can use a small flat blade screwdriver for this. There should be 2-4 more screw covers on the outer side of the base, underneath the controller ports. The older model PS2’s have 4 screw covers, while the newer ones have only 2. Remove them all, and you should now have a total of 8-10 screws unveiled. Set the screw covers aside.
Use your knife to cut the warranty tape that is covering the seam between the back and the top cover. (By the power switch). Just trace the seam through the tape with the knife so that it will not be holding you back when you go to remove the top later. You can also just remove the tape completely if you want.