So we have a HP LaserJet 3600 and every page that prints out there is a yellow line both front and back of the page.As you can see in the included attachment.I have replaced the transfer roller, the fuser and the yellow toner (all of the toner as well).All the toner in the printer are HP toners. When this started happing the user was using a used yellow toner.So I replaced it with a brand new yellow one, I ran a test and it printed out fine but after 20 print outs or so it started printing yellow.
I looked at each toner and opened the covering of them and looked at the roller on the inside and did not see any yellow toner on them, nor did I see any kind of smudge marks.I also checked the rollers to make sure they did not have any kind of toner on them and they did not.Do you guys have any other suggestions that I could try?As...