This machine uses a dry two-component magnetic brush development system.
This machine uses 2 mixing augers [C] and [D] to keep the developer evenly mixed. Mixing auger 2 [C] transports excess developer, scraped off the development roller by the doctor blade [B], towards the rear of the machine. Mixing auger 1 [D] returns the excess developer, along with new toner, to the front of the mixing assembly. Here the developer is reapplied to the development roller.
The TD sensor [A] detects the toner density in the development unit.