Skip to main content

Fix Epson AcuLaser C1100 Printing Darker on One Side

· 2 min read

If your Epson AcuLaser C1100 is printing noticeably darker on the left side of the page, the most likely cause is a dirty or misaligned print head. This can happen over time as toner dust accumulates inside the printer.

Clean the print head​

  1. Locate the blue lever on the right side of the printer.
  2. Move the lever in and out completely several times. This actuates the internal cleaning mechanism and helps redistribute toner evenly.
  3. Print a test page to check if the issue is resolved.

If the uneven printing persists after cleaning, the toner cartridge may be running low or defective and should be replaced.

Change a toner cartridge before its expiration​

You can proactively replace a toner cartridge before it runs out completely to avoid print quality degradation:

  1. Make sure that Ready or Sleep is displayed on the LCD panel.
  2. On the control panel, navigate to the Reset Menu and select Change Toner X (where X is C for Cyan, M for Magenta, Y for Yellow, or K for Black).
  3. The printer will move the selected cartridge to the replacement position. Wait until the LCD displays Replace Toner X.
  4. Open the printer cover, remove the old cartridge, and insert the new one.
  5. Close the cover. The printer will automatically recognise the new cartridge.

Maintenance tips​

  • Print regularly — infrequent use can cause toner to settle unevenly, leading to streaks and uneven density.
  • Store toner cartridges in a cool, dry place away from direct sunlight.
  • Shake new cartridges gently from side to side before installing to distribute toner evenly inside the cartridge.