If you have print quality problems, clean the corona wires as follows:
| 1 | Turn off the printer power switch. Fully open the top cover by lifting up on the handle (1). |
| 2 | Take out a drum unit and toner cartridge assembly.   IMPORTANT | • | We recommend that you place the drum unit and toner cartridge assembly on a clean, flat surface with a sheet of disposable paper or cloth underneath it in case you accidentally spill or scatter toner. | | • | To prevent damage to the printer from static electricity, DO NOT touch the electrodes shown in the illustration. |
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| 3 | Clean the primary corona wire inside the drum unit by gently sliding the green tab from left to right and right to left 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. |
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| 4 | Slide the drum unit and toner cartridge assembly into the printer. Make sure that you match the toner cartridge colour to the same colour label on the printer. | | C - Cyan M - Magenta | Y - Yellow K - Black |
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| 5 | Repeat steps 2 to 4 to clean each of the remaining corona wires. |
| 6 | Close the top cover of the printer. |
| 7 | Turn the printer power switch back on. |
