No.  | Name  | No.  | Name  | 
|---|---|---|---|
1  | Development Rollers  | 3  | Development Motor  | 
2  | Transport Augers  | 4  | Toner Agitator Motor  | 
This shows how the two development sleeves, three transport augers, and toner collection coil are driven.
The toner density sensor [1] is located at the higher end of the tilted toner collection coil, opposite the driven gears [2]. An ID chip built-into the TD sensor monitors the density of the toner for toner density control for the appearance of text and images on paper.