Clean the Corona Wire

If you have print quality problems or the control panel displays [Drum !] status, clean the corona wire.

Open the scanner cover. The pull arm on the left side of the machine will lock. Open the top cover.
Remove the toner cartridge and drum unit assembly from the machine.
Clean the corona wire inside the drum unit by gently sliding the green tab from left to right and right to left several times.

Be sure to return the tab to the Home position (). The arrow on the tab must be aligned with the arrow on the drum unit. If it is not, printed pages may have a vertical stripe.
Reinsert the toner cartridge and drum unit assembly back into the machine.
Close the top cover. Lift the scanner cover slightly, pull the pull arm on the left side of the machine towards you, and then close the scanner cover using both hands.

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