Do the following cleaning at 300k.

  1. Remove the toner supply unit. (Toner Supply Unit)

  2. Remove the Toner Shield Glass Cleaning Tool [A].

  3. Insert the Toner Shield Glass Cleaning Tool [A] into the slot (red circles in the photo below), and slide it back-and-forth about 5 times to clean the toner shield glass on the laser units. Do this procedure for all 4 colors.