Vertical dark lines
Note: Before solving the problem, print the Print Quality Test Pages. From the home screen, touch Settings >
Troubleshooting > Print Quality Test Pages.
Action Yes No
Step 1
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 in
the tray.
• You can also change the setting on the printer control
panel. From the home screen, touch Settings > Paper >
Tray
Configuration
> Paper Size/Type.
b Print the document.
Do vertical dark lines appear on prints?
Go to step 2. The problem is
solved.
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 vertical dark lines appear on prints?
Go to step 3. The problem is
solved.
Step 3
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 may cause print quality problems.
Warning—Potential Damage: Do not touch the
photoconductor drum under the imaging unit. Doing so may
aect the quality of future print jobs.
b Print the document.
Do vertical dark lines appear on prints?
Go to step 4. The problem is
solved.
Troubleshooting 256
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