Lexmark MX421 User Manual page 198

Troubleshooting
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.
Is the print dark?
Step 2
a
Turn off the printer, wait for about 10 seconds, and then turn on
the printer.
b
Reduce toner darkness.
From the control panel, navigate to:
Settings > Print > Quality > Toner Darkness
c
Print the document.
Is the print dark?
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 dark?
Step 4
Check if the paper has texture or rough finishes.
Are you printing on textured or rough paper?
Step 5
a
Replace textured paper with plain paper.
b
Print the document.
Is the print dark?
Yes No
Go to step 2. The problem is
solved.
Go to step 3. The problem is
solved.
Go to step 4. The problem is
solved.
Go to step 5. Go to step 6.
Go to step 6. The problem is
solved.
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