LaserJet 5P dark background

[tig2006]

Hello,

I recently replaced the cartridge on my LaserJet 5P printer after trying to clean the original one and damaging it. After replacing the cartridge I have all pages printed with vertical dark background from top to the bottom on 2/3 of right side of the page. I disassembled the printer and cleaned thorougly. Still the same results. If it is not cartridge, what else it could be? How can I find out if it is cartridge or something else? Your help is greatly appreciated.

[JJprinter]

The only thing I can think of is the second cartridge could be faulty, try another.
Or the fuser is going and needs to be repaired.

[tig2006]

Thanks for your response. What is fuser and how do I repair it? Thanks again!