We have a HP LaserJet CP5525 that is leaving a hor. streak across the top of prints
I opened it up and tried cleaning
I seem to find a maint. manual for this printer
When do I need to install a maint. kit? who do I fined out if it needs it?
What can I try besides changing toner(Done that already)
Also I opened up the back door and noticed a long plastic container holding what looks to be used toner. Do I replace this? empty?