Action Yes No
Step 1
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 lines or streaks appear on prints?
Go to step 2. The problem is
solved.
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
aect the quality of future print jobs.
b Print the document.
Do vertical dark lines or streaks appear on prints?
Go to step 3. The problem is
solved.
Step 3
a Replace the imaging unit.
b Print the document.
Do vertical dark lines or streaks appear on prints?
Contact your
dealer. The problem is
solved.
Vertical dark streaks with print missing
Contact your dealer.
Troubleshooting 161
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