This will guide you through the process of replacing your PlayStation's optical drive.
Remove the parallel port cover on the back of the PlayStation.
Flip over the PlayStation and remove the six screws from the bottom.
Turn the PlayStation upright. Remove the cover by lifting it up.
Carefully disconnect the gold-colored ribbon cable from it's connector.
Disconnect the second cable by pulling up on the plastic connector at the end.
Lift the optical drive off of the PlayStation.