If you are experiencing print quality problems, please clean the corona wire as follows:

1. Turn off the printer power switch, and then unplug the printer power cord.

2. Press the cover release button and then open the front cover of the printer.

3. Take out the drum unit assembly (drum unit with the toner cartridge).

    

   • We recommend that you put the drum unit assembly on a piece of disposable paper or cloth in case you accidentally spill the toner.
   • To prevent damage to the printer from static electricity, do not touch the electrodes shown below.

    

    
   

4. Clean the primary corona wire inside the drum unit by gently sliding the blue tab from right to left several times.

   Make sure to return the tab to the Home position. If you do not, printed pages will have a black vertical stripe.

    
   

5. Put the drum unit assembly back in the printer.

6. Close the front cover.

7. Plug the printer power cord back in, and then turn the printer power switch back on.