Vertical black lines in middle of page

Hi people,

I have a LaserJet 4250n printer which has slight black spots / vertical lines in the middle of my pages. It is at the bottom, but it gets lighter in some points and again takes upward. I tried to replace the toner cartridge and cleaning of the rollers, nothing helps.

Any ideas?

Thank you!
James

Hi James,

I am a technician in Australia HP printer and an employee full time. I deal with many printers with this one.

Lines to the bottom of the page can be caused by a few things - according to what looks like the line.

If it's a dirty dirty streaky brand constantly at the bottom of the page, migh you have a dirty oven - it may have been picking up toner and it has put in place and then put it down on paper.

A thin black line set can be a scratched or developer - drum laser could be refraction and drawing the defect on the drum.

Blank or white lines could be something stopping the toner to the study - under the toner transfer roller may have something stuck on this issue.

A repeated mark or default could also be a dirty oven - glue or wax envelopes and labels could do.

Try changing the toner with others to test - if you can borrow one.

Make 3 or 4 cleaning pages - in the menu, configure device, menu printing, cleaning page to create/process quality.

Remove fuser - door back comes, little blue clips, pull it. out - rotate using the green button and you might be able to gently remove something stuck in it.

If you can get to an another 4250 / 4350 you could borrow from the fuser and know.

For this machine, I find used ovens and dirty printers more often these symptoms.  Good next is of poor quality after market cartridges.

Hopefully I can help you here

Steve Hewitt

HP Australia

Melbourne.

Tags: HP Printers

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