Please follow the steps below to clean the corona wire of the drum unit.

1. Open the top cover.
   
   
   
2. Slowly take out the drum unit and toner cartridge assembly.
   
   
   
3. Clean the corona wire inside the drum unit by gently sliding the green tab from left to right to left several times.
   
   

   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 into the machine.
   
   
   
5. Close the top cover.