Hi,
More than likely the scanner assembly needs replacing, otherwise it's the dc controller, bith fairly expensive parts to replace.
If the printer was working fine, remove the covers and check the cable seating from the laser scanner to the dc controller. If the cable is ok, replace the scanner. If that doesn't cure it replace the DC controller. As I said these are both fairly expensive parts so unless you can get second user I'd be more tempted to spend the money on a more up to date printer. It won't cost more to replace it than repair it!
Stu, January 2005