Printer Leaving Lines on Every Page? Here's the Fix

Quick answer

Run the printer's built-in head cleaning cycle once, then print a test page. If lines are still there, clean the glass strip inside the printer (for laser printers) or remove and wipe the printhead (for inkjets).

Why this happens

I've seen this a hundred times. Lines on every page usually mean something physical is blocking the print. For inkjet printers, it's dried ink on the printhead. For laser printers, it's toner dust stuck on the drum or a dirty corona wire. Had a client last month whose whole office was tossing pages because of a single hair stuck on the roller. A quick wipe fixed it.

You don't need to replace anything yet. Most fixes are simple cleaning jobs. Let's go through them.

Step-by-step fix

1. Run the built-in cleaning cycle – On your printer's screen (or in printer software on PC), find 'Maintenance' or 'Tools'. Select 'Clean Printhead' or 'Drum Cleaning'. Run it once. Print a test page. This clears minor clogs.
2. Check the test page – If lines are still there, look at the pattern. Vertical lines that repeat at fixed intervals often point to a dirty roller. Horizontal lines mean the printhead is moving but hitting something.
3. Clean the glass strip (laser printers) – Open the printer, find the glass strip inside (often near the drum). Wipe it with a dry, lint-free cloth. Don't use alcohol – it can damage the coating.
4. Remove and wipe the printhead (inkjet printers) – Turn off the printer, open the cartridge access door. Remove the printhead (check your model, some snap out). Wipe the bottom with a damp paper towel. Let it dry completely before reinserting.
5. Check for debris – Run a blank sheet through. Look at the paper for any marks. Repeat with a flash light inside the printer – look for stuck paper bits, hair, or staples.

Alternative fixes

• Replace the drum (laser printers) – If lines are black and smudgy, the drum is worn out. For Brother printers, the drum and toner are separate. Put in a new drum, not new toner.
• Use a cleaning sheet – Some brands sell special sticky sheets that pull debris off rollers. Works for occasional lines but not heavy buildup.
• Reset the printer – Turn it off, unplug for 30 seconds, plug back in. This clears any software glitches that cause the printhead to misalign.
• Replace the toner cartridge (laser printers) – If lines are white or missing toner, the cartridge is running out. Shake it gently to redistribute toner first, then print a test page.

Prevention tip

Print something at least once a week, even if it's just a test page. Inkjet printers are the worst – they dry out fast. For laser printers, vacuum the inside every 3 months to keep dust off the drum. And don't let paper sit in the tray for months – humidity warps it, causing jams and lines.

Last tip: if you clean the glass strip and still get lines, the drum might have a scratch. You'll see a thin, solid line that won't wipe off. That's a hardware replacement job, not a cleaning one.

That's it. You're probably done in 10 minutes. Save the new printer money for something else.