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Lets give it a try. The purchasedate will be 1991 (HI).
I'll suppose you allready cleaned the laserunit.
You can try to clean the laserslides, sometimes they are sticky and dry. Then the laser is not fast and precise enough to read the index of your CD.
Clean them with some alcohol on cottontips.
When they are really clean, use just a little teflonoil to make sure the laserunit slides very smoothly.
Bad news ** it may have damaged the Laser or knocked it out of alignment. A Electronic Tech would have to do that kind of repair.
Depending on what brand it is it may not be cost effective to repair. If it was made in China there will probably be no parts available
If this unit has a built in DVD player, then the player's lens may need cleaning. There are lens cleaning discs available for this. If the unit does not have a built in player, then the same applies to your player & there is no problem with the projector itself.