Question about HP LaserJet 4050n Printer

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I have black vertical lines - HP LaserJet 4050n Printer

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Image defects on LJ printers are usually the toner cart. or the fuser:

This is the test to determine toner or fuser issue.
Print a test page
When you hear the paper feed into the machine open the top to stop the machine
Remove the toner cart.
You should be able to see the page with printing on it. (This is before the page hits the fuser)
If you can see the image Defect on the page the problem is most likely the cartridge but NOT the fuser.
If the page is clean the problem is most likely the fuser.
Hope this helps

Posted on Mar 28, 2009

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Hi,

Black vertical lines could either be a scratch on the drum or a dirty charging corona wire. Order a new drum and clean the Corona with a brush. Image of Corona This should resolve the issue.

Thanks,
ArmyMason

Posted on Feb 26, 2009

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