My printer is leaving faint marks of other words down the side of the page...any way to fix that?

Change the cartridge

Are the black marks down both sides of the page and if so what shape are they? Are they a sharp edge black mark or faint feathered mark?
You say the black marks are around the edges of the page, does that mean all 4 edges?
Also is it when you print from your computer or when you copy using the document feeder?
There are 3 possible causes but I need to know the answers to my questions.

Hi

you need to change and the drum

hi this may be the toner roller or supply drum for the toner cartridge . if it scratched or worn it leaves marks on the drum or the roller, which in turn fills with toner and leaves an imprint on the page, you can check these , just remove the toner cartridge and look at the green roller and also look at the black roller, it might be a simple case of changing it or cleaning it....hope this helps

run a diagnostic. Clean the heads, and get new cartridges

It may need general cleaning OR have toner stuck to the fuser roller.

Be very careful of the ionizing wires... they are fragile in laser printers.

replace your cartridge, and all should be fine.

I had a similar problem, which I fixed by carefully wiping the drum with a soft tissue.

There are 2 seperate glass areas on the top, the large one is for when you lift the cover to scan or copy, the little narrow one is when you use the ADF. If there is a dot or a spec on the narrow part, it will leave the streak on the page, Clean the narrow part really well. I use a foaming window cleaner, and a razor blade.
You may also want to check to see if there are any small scratches on that glass. That will cause the same thing to happen.

Swap in another cartridge and see if it fixes the problem.