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While the line is showing up on the output pages. Stop printing and put paper in the manual feed tray (tray 1). Start printing again. As a page gets pulled into the printer about 1/2 way open the top cover. Pull out the toner and look at the page inside the printer. If it doesn't have the grey/black line, get the fuser replaced. It is defective.
If the line has a 1/8" white margin on either side, clean your glass and mirrors.
If the line is all the way across your page, consult your users manual for cleaning the sawtooth electrode (open the front door and take out your waste tank, there is a green rod on each drum cartridge you can pull and hear a zipping noise) and cleaning the laser lens (there should be a cleaning wand under your waste tank, turn pad side down and insert in the gap underneath your drum cartridge)
sounds like your black toner cartridge is getting low or not filled evenly. To fix this until it get a bit lower on toner just take the cartridge out and holding it up right give it a few shakes side to side. The will spread the toner power out inside and you should be printing normally again.
This can also happen if you moved or bumped the printer. Usually you only see this when the toner is low or after you print a lot of pages. Most text is in the mid of the paper so thats where the toner get s used the most.
The fact that it's printing anything suggests that it is not a Toner problem. Remove the toner, and have a look at the run inside the printer, checking for any excess toner which is in there. Also, check the Drum and Imaging Unit for damage, wear and tear etc. There will also be a static strip near the imager, with a little tab which you can sweep across the unit to clean it.
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 smudge or marks on the page the problem is most likely the cartridge or cleaning roller but NOT the fuser. If the page is clean the problem is most likely the fuser.
(Possibly by staple going threw machine if that what each of the five marks look like, all those removed staples always seem to end up in printers)
You can pull it out (I think right top cover opens and cartridge pulls up and to the right) then .. turn it over and gently pull back cover see drum has same marks as you see on paper, you can gently rotate drum by using gear on edge do not force it only turns easy one way, Do not touch drum surface very delicate and sensitive. Normal disposable item buy a New cartridge here is HP part number for your model HP C8543X (HP 43X) Toner Cart.