Hp Laserjet 3500 when printing we are getting blue vertical lines, printer cleaning page is fine, but still getting vertical lines when printing. Any ideas.

clean the drum of the toner with tissue paper and reinstall hopefully it will resolve the issue

Your printer's drum must be cleaned or replaced if damaged.

The cyan image unit is the problem...replace it and the lines should go away.
(HP warranties their cartridges so you may be able to get it replaced under warranty)
If you are using a re-manufactured cartridge, take it back to the seller and see if they will replace it.

Two thing we have to observe, is it cartridge faulty? or Printer?..
> Replace with another cartridge check the quality. if it rectified replace with another cartridge..faulty cleaning blade in catrdige cause of vertical lines in print outs..
> Might be teflon sleeve got damaged, replace the teflon sleeve if available or else replace fuser assm..

22.6mm marks indicate a bad cartridge. Try a different cartridge if you have one.

You have to replace all empty cartridges...no other solution

try another toner cartridge

Does this happen both when copying and printing?
For printing solution, try another toner cartridge.
If lines continue to appear when copying (primarily through the automatic feeder) then lift the auto feeder, and clean the glass -mainly the narrow piece on the left side.

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You can get the Fixing Film Sleeve changed you dont have to change the whole fuser assembly

HP LaserJet 3500 Fuser Sleeve Manufacturer: Hewlett Packard
HP LaserJet 3500 Fuser Sleeve - (Fixing Film Sleeve) $59.95Contact : [email protected]

800-551-1943 Mon - Fri 8:30 - 5:00 CST

your toner drum coating eject
change toner drum