Cleaning the corona wires

If you have print quality problems, clean the corona wire as follows:

1	Press the front cover release button and then open the front cover.
2	Take out the drum unit and toner cartridge assembly. IMPORTANT We recommend that you put the drum unit and toner cartridge assembly on a piece of disposable paper or cloth in case you accidentally spill or scatter toner. To prevent damage to the printer caused by static electricity, DO NOT touch the electrodes shown in the illustration.
3	Clean the primary corona wire inside the drum unit by gently sliding the blue tab from right to left and left to right several times. Note Be sure to return the tab to the home position () (1). If you do not, printed pages may have a vertical stripe.
4	Put the drum unit and toner cartridge assembly back in the printer. Close the front cover.