Note: Before solving the problem, print the Print Quality Test Pages. From the control panel, navigate to Settings > Troubleshooting > Print Quality Test Pages. For non‑touch‑screen printer models, press to navigate through the settings.
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 vertical white lines appear on prints?
Go to step 2.
The problem is solved.
Fix slow printing problems. For more information, see Slow printing.
Go to step 3.
Replace the imaging unit.
Contact customer support.
Check the paper settings in the print dialog and in the printer to get clean prints. Reinstalling or replacing the imaging unit may also help solve this print quality issue.
Prevent vertical lines from appearing across your prints by checking the toner cartridge.