Cleaning disks work just like cassette or VCR head cleaners. If cleaning does not help, then the drive itself probably needs to be replaced. In A PS2 Model 50. Be Careful With The Plastic Clips. Quite possibly the internal battery needs to be replaced.
Tension is maintained on the battery by a plastic clip.
Make sure that the power is off when you remove the dead battery. With the power off, and yourself grounded, carefully pry out the old chip from its socket and insert the replacement. He says that blowing the power supply out with air will solve the problem. Diskette for Mod. Not provided with ValuePoint machine shipments.