Lexmark MX421 User Manual page 206

Troubleshooting
Action
Step 7
a
Replace the toner cartridge.
b
Print the document.
Is the print light?
Mottled print and dots
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 toner cartridge is not supported, then install a
supported one.
b
Print the document.
Is the print mottled?
Step 2
Check the printer for leaked toner contamination.
Is the printer free of leaked toner?
Step 3
a
Replace the toner cartridge.
b
Print the document.
Is the print mottled?
Step 4
Check the status of the imaging unit. From the control panel,
navigate to:
Status/Supplies > Supplies
Is the imaging unit near end of life?
Yes No
Contact customer The problem is
support. solved.
Yes No
Go to step 2. The problem is
solved.
Go to step 4. Go to step 3.
Go to step 4. The problem is
solved.
Go to step 5. Contact
support.
206
to
customer