Step 1  Check if the printer is using a genuine and supported Lexmark toner cartridge. Note: If the cartridge is not supported, then install a supported one.  Print the document.
Do horizontal light bands appear on prints? | Go to step 2. | The problem is solved. |
Step 2  Remove, and then insert the imaging unit. Warning—Potential Damage: Do not expose the imaging unit to direct light for more than 10 minutes. Extended exposure to light may 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.  Print the document.
Do horizontal light bands appear on prints? | Go to step 3. | The problem is solved. |
Step 3  Replace the imaging unit.  Print the document.
Do horizontal light bands appear on prints? | Contact customer support. | The problem is solved. |