Lexmark MX931 User Manual page 340

Troubleshoot a problem
Action
Step 2
a
Remove the printhead wiper, and then clean the printhead lens.
b
Print the document.
Do horizontal light bands appear on prints?
Step 3
a
Remove, and then insert the imaging unit.
Warning—Potential Damage: Do not expose the imaging unit
to direct light. Extended exposure to light may cause print
quality problems.
Warning—Potential Damage: Do not touch the
photoconductor drum. Doing so may affect the quality of
future print jobs.
b
Print the document.
Do horizontal light bands appear on prints?
Step 4
a
Replace the imaging unit.
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 home screen, touch Settings >
Troubleshooting > Print Quality Test Pages.
Action
Step 1
a
Remove the printhead wiper, and then clean the printhead lens.
b
Print the document.
Do horizontal light bands appear on prints?
Yes No
Go to step 3. The problem is
solved.
Go to step 4. The problem is
solved.
Contact customer The problem is
support. solved.
Yes No
Go to step 2. The problem is
solved.
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