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Lexmark MX721

Lexmark MX721

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Vertical white lines

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.

ActionYesNo

Step 1

  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.

  2. Print the document.

Do vertical white lines appear on prints?

Go to step 2.

The problem is solved.

Step 2

Fix slow printing problems. For more information, see Slow printing.

Do vertical white lines appear on prints?

Go to step 3.

The problem is solved.

Step 3

  1. Replace the imaging unit.

  2. Print the document.

Do vertical white lines appear on prints?

Contact customer support.

The problem is solved.
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