Lexmark ST9822 User Manual page 207

Troubleshooting
Vertical dark streaks with print missing
Note: Before solving the problem, print the Print Quality Test Pages. From the control panel, navigate to
Settings > Troubleshooting > Print Quality Test Pages.
Action
Step 1
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 may 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
Remove any packing material that is stuck on the imaging unit.
Note: Make sure to remove any obstruction between the
charge roller and photoconductor drum.
c
Insert the imaging unit.
d
Print the document.
Do vertical dark streaks with missing images appear on prints?
Step 2
a
Check if the printer is using a genuine and supported toner
cartridge.
Note: If the toner 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 2. The problem is
solved.
Contact customer The problem is
support. solved.
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