Trying to copy checks I am getting solid black page

The cartridge or Toner is splitting out more ink.... Remove the cartridge Clean it and place it again.

Hi Robert, if you're trying to copy something that you've placed on the glass without closing the cover of the copier, there's too much back light (coming from behind the item to be copied) and therefore the resulting page will be black. The only light should come from within the copier itself.
If the item you're copying is bulky and will not allow the cover to close, try taking an 8-1/2 x 11 inch piece of paper and cutting out only enough of the page to allow your item (to be copied) to sit flat on the glass while covering the remaining exposed glass with the paper.
I hope this helps, good luck.

The scan assembly has gone out. Parts are not available except the entire scan assembly, I can get you a part number and price if you like.

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

"dk" means the the life black drum is over. You need to replaced the drum and blade. Or you can replaced the whole drum cartridge. The line that you are getting from one of the blades, more likely from the black drum. Pull out all the drum check if there is toner on the drums.

You have to replace the white tape, connecting the scanner sensor with the printer PCB.

can you try to post a copy of what you see wrong . and try to do an internal printout " function-6-4-start- under the fax button. "

When I Copy or Scan with my HP LaserJet 3050, a solid black line appears on the left margin of the page. . Can you suggest any solution to the problem. .

first try scan doucument to the pc if it is also come black then change scanner assy,
if problem is not found then replace logic card

Sounds like a charge problem, check the clutch that moves the charge roller to contact the drum. The clutch is on the back of the machine. Brad