Vertical dark lines or streaks

Step 1

1. Check if the printer is using a genuine and supported Lexmark toner cartridge.

   Note:  If the toner cartridge is not supported, then install a supported one.



2. Print the document.

Do vertical dark lines or streaks appear on prints?

Go to step 2.

The problem is solved.

Step 2

1. Remove, and then reinstall the imaging unit.

   Warning—Potential Damage:  Do not expose the imaging unit to direct light for more than 10 minutes. Extended exposure to light can cause print quality problems.

   Warning—Potential Damage:  Do not touch the photoconductor drum under the imaging unit. Doing so may affect the quality of future print jobs.



2. Print the document.

Do vertical dark lines or streaks appear on prints?

Go to step 3.

The problem is solved.

Step 3

1. Replace the imaging unit.



2. Print the document.

Do vertical dark lines or streaks appear on prints?

Contact customer support.

The problem is solved.