If you have print quality problems, clean the corona wire as follows:
| 1 | Turn off the machine’s power switch. Disconnect all cables, and then unplug the power cord from the electrical socket. |
| 2 | Open the front cover. |
| 3 | Slowly take out the drum unit and toner cartridge assembly.   CAUTION | | We recommend that you place the drum unit and toner cartridge assembly on a clean, flat surface with a piece of disposable paper or cloth underneath it in case you accidentally spill or scatter toner. | | | Handle the toner cartridge carefully. If toner scatters on your hands or clothes, wipe or wash it off with cold water at once. | | | To prevent damage to the machine caused by static electricity, DO NOT touch the electrodes shown in the illustration. |
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| 4 | Clean the corona wire inside the drum unit by gently sliding the green tab from right to left and left to right several times. CAUTION | | Be sure to return the green tab to the home position (  ) (1). If you do not, printed pages may have a vertical stripe. |
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| 5 | Put the drum unit and toner cartridge assembly back in the machine. |
| 6 | Close the front cover. |
| 7 | Plug the machine’s power cord back into the electrical socket first, and then reconnect all cables. Turn on the machine’s power switch. CAUTION | | To avoid print quality problems, DO NOT touch the shaded parts shown in the illustrations below. |
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