Lexmark MS531 User Manual page 149

Troubleshoot a problem
Action
Step 2
a
Remove, and then insert 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
Print the document.
Do vertical dark lines or streaks appear on prints?
Step 3
a
Replace the imaging unit.
b
Print the document.
Do vertical dark lines or streaks appear on prints?
Vertical dark streaks with print missing
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
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.
Do vertical dark streaks with missing images appear on prints?
Yes No
Go to step 3. 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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