I found this article over at Tweak3D.net. It will guide you through the complete proccess of repairing that annoying disc read error that sometimes happens to older PS2’s. I’ve had good results, and so have many others. Let me know how it goes for you
This guide will walk you through the process of repairing a malfunctioning Playstation 2 or one that gives you Disc Read Errors (called “DRE” from here on). I have tested this process on two Playstation 2s now and it completely fixed the errors both were experiencing. The model # was SCPH-30001 on both units, but the process should be the same for others.
You can read the entire article over at Tweek3D.net.