Solid line printing from top to bottom of the page on all copies

All web based documents, especially bank statements, require a COLOUR cartridge, so if your cartridge is empty, it will print blank pages. Although the font may look black... it is normally NOT. Altentaively you may also need to instruct your printer to print "background images".

Open up the doc feeder and clean the scanner glass

if printing is fine and copying causes line on page, I suspect that there is dirt on the scanner glass. Clean scanner glass.

Is it From top to bottom? if it is, clean the optics unit, its lens array and mirrors.

Check the wondow where the paper passes to be scanned. You will probably find some debris or white out stuck on the glass. That is usually the cause of vertical lines on sent faxes.

open the printer and clean all rollers you find. should fix your problem if the line goes from top to bottom

Every print job, copy, and fax have the solid black line across the pages. I have changed the drum and the cartridge and even tried cleaning mode. Please help!!! I have a HP Laser Jet 2840 All in One

try moving the small blue slider on top of the drum cartridge side to side 10 times.

White Lines on the Printed Page ID:193
Clean the print nozzles as follows:

1. Go to Start, Programs, Lexmark, Lexmark Solution Center (or Lexmark Control Program) and select the Cartridges tab.
2. Select Cartridge Nozzles (or Clean Print Nozzles).
3. Check the diagonal lines above and below the solid horizontal lines. The diagonal lines should be continuously solid from left to right, with no gaps.
4. If there are gaps at the top that diminish at the bottom, run the Clean Print Nozzle page a few more times. If the gaps are gone, the Clean Print Nozzle page has probably resolved the problem.
5. If the gaps still exist, you should unblock ("wick") the cartridges. See How to Unblock/Wick the Cartridge Nozzles.
   For additional help, refer to the following article: How to Clean the Maintenance Station .

Toner issue getting to drum - use gen toner cart.

or Drum blade stuffed (lines are down page fro top to bottom- replace drum assy

Drum has been exposed to light faint or blank across copies repeated 4 times down page - replace drum assy

or upper fuser roller stuffed, down page, smudgy print -  replace fuser

LSU(laser) or boards rarely cause issues