Black lines and smudges on printed output can be due to dirty printers. The accumulation of dirt, dust, or toner on a printer’s rollers or transfer belt can leave tracks on the page when the paper moves through the printer. Dirt on the rollers can also smudge toner on the printed output. Thus, cleaning laser printers, and their rollers especially, is one potential resolution for fixing black marks on pages. A leaking toner cartridge can also be another big factor behind black roller marks left on the paper. That will leak toner onto the printer and paper, which leaves black marks on the printed output.
What causes black lines on paper when printing?
1. Clean the Laser Printer
We’ve written extensively on printer inconsistencies. Check out these guides for more information.
2. Replace the Toner Cartridge
Some users might need to replace leaking toner cartridges when black marks show up on their printed pages. To check if the cartridge is leaking, remove it from the printer. Then place the cartridge on blank A4 paper. Shake or tap the cartridge a little to see if it emits toner onto the paper. If so, get a new toner cartridge and insert that into the printer.
3. Open the Printer Troubleshooter
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