Lexmark MX721 User Manual page 236

Troubleshooting
Horizontal light bands
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 horizontal light bands appear on prints?
Step 2
a
Turn off the printer, wait for about 10 seconds, and then turn on
the printer.
b
Print the document.
Do horizontal light bands appear on prints?
Vertical light bands
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.
Yes No
Go to step 2. The problem is
solved.
Contact customer The problem is
support. solved.
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