First try a cd head cleaner. It has to work well enough to ffwd to track 4 or as instructed. If that does not work you need to open the case. Unplug power as the laser can blind you. 5 screws on the back and one each side. Lift the lid from the back to about 30 degrees and pull/ wiggle it off. Use a cotton bud wetted with alcohol (Isopropyl or surgical). You need to wipe the glass lens very very gently. wipe dry with other end of cotton bud. Recover and try.
While covers are off look for bulging capacitors or signs of black overheating.
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