1. Remove the Drum unit. (Drum Unit)
  2. Detach the development unit (K, M, C and Y)(a).
    *: connection portion (b)

    *: When detaching the development unit (a), hold both the left and right handles (b).

    *: Make sure not to touch the gears (a) in the drive section where there is grease.
  3. Detach the development unit (K, M, C and Y)(a).

  4. Reattach the parts in the original position.

    When attaching the development unit (a), match the colors between the back side (b) of the development unit and the right side (c) of the main unit.

    *: Remove the cap (b) when attaching the new development unit (a).

  5. Attach the new drum unit (K,M,C and Y).
  6. Reattach the parts in the original position.
  7. Attach the new ITB unit.
  8. Reattach the parts in the original position.
  9. Detach the toner cartridges (K, M, C and Y).
  10. Close the top tray.