Lexmark CX421 User Manual page 211

Troubleshooting
Action
Step 2
a
Load paper from a fresh package.
Note: Paper absorbs moisture due to high humidity. Store
paper in its original wrapper until you use it.
b
Print the document.
Do dark lines appear on prints?
Step 3
a
Remove, and then insert the imaging kit.
Warning—Potential Damage: Do not expose the imaging kit
to direct light. Extended exposure to light may cause print
quality problems.
Warning—Potential Damage: Do not touch the
photoconductor drum under the imaging kit. Doing so may
affect the quality of future print jobs.
b
Print the document.
Do dark lines appear on prints?
Vertical dark 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.
Yes No
Go to step 3. The problem is
solved.
Contact customer The problem is
support. solved.
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