Lexmark MX421 User Manual page 218

Troubleshooting
Action
a
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.
b
Print the document.
Do vertical light bands appear on prints?
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
navigate through the settings.
Action
Step 1
a
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.
b
Print the document.
Do vertical white lines appear on prints?
Step 2
a
Depending on your operating system, specify the paper type
from the Printing Preferences or Print dialog.
Notes:
•
Make sure that the setting matches the paper loaded.
•
You can also change the setting on the printer control
panel.
b
Print the document.
Do vertical white lines appear on prints?
Yes No
Contact customer The problem is
support. solved.
Yes No
Go to step 2. The problem is
solved.
Contact customer The problem is
support. solved.
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