Getting ready to dump HP also.
HP LJ-3055, same scanning problem. So many people have this problem but HP does nothing about it, and not offer a good fix. Had to find the mirror cleaning solution, but it did not work for me.
I replaced the scanner assembly, I replaced the scanner motor, the bulb does not seem to light up, but does flicker. I cleaned the mirrors. I spent hours and hours. It is time to bid HP good bye.
I have been a loyal HP customer for decades, but they have deteriorited to being beyond hope. Only interested in selling upgrades to crapier products, not take care of legacy customers.
My HP Laser 4 is still working, after 20 years. Had a few problems, but at least solid machine. The new and newer ones are crap.
I am going to get a Canon MFC, since I have tried and cannot fix this LJ 3500, and I certainly do not want to invest in another HP.
A shame really, but HP doesn't care.