- Rear cover (Rear Cover)
 - Controller box cover (Controller Board)
 - Only for MF models: FCU and Speaker bracket (Controller Board)
 - Disconnect CN315 on the EGB
 - Remove two screws [A] for the waste toner sensor base.
 - Remove all the AIO cartridges. (AIO Cartridge)
 - Image transfer belt unit (Image Transfer Belt Unit)
 - Waste toner sensor base [B]
 - Waste toner bottle set sensor [C] (3hooks, 
× 1)
 
- When reinstalling the waste toner bottle set sensor, connect it to the white connector of the harness.