Lexmark MX421 User Manual page 205

Troubleshooting
Action
Step 3
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. Navigate to Settings > Paper > Tray Configuration
> Paper Size/Type.
b
Print the document.
Is the print light?
Step 4
a
Depending on your operating system, specify the print
resolution from the Printing Preferences or Print dialog.
b
Set the resolution to 600 dpi.
c
Print the document.
Is the print light?
Step 5
a
Remove the imaging unit.
Warning—Potential Damage: Do not expose the imaging unit
to direct light for more than 10 minutes. Extended exposure
to light can cause print quality problems.
Warning—Potential Damage: Do not touch the
photoconductor drum under the imaging unit. Doing so may
affect the quality of future print jobs.
b
Firmly shake the imaging unit to redistribute the toner.
c
Insert the imaging unit.
d
Turn off the printer, wait for 10 seconds, and then turn on the
printer.
e
Print the document.
Is the print light?
Step 6
a
Check the status of the toner cartridge.
From the control panel, navigate to:
Settings > Reports > Device > Device Statistics
b
From the Supply Information section of the pages printed,
check the status of the toner cartridge.
Is the toner cartridge near end of life?
Yes No
Go to step 4. The problem is
solved.
Go to step 5. The problem is
solved.
Go to step 6. The problem is
solved.
Go to step 7. Contact
support.
205
customer