Toshiba DP120F Service Manual page 283

(4) Developer process
This process makes the electrostatic latent image on the drum visible to the human eye
by using toner.
The developer process is configured by the magnetic roller which rotates at a high speed,
the sleeve roller which is located on the outside of the magnetic roller, and the doctor
blade.
The main components of toner are magnetic powder and resin, and are given a negative
charge by the friction. Therefore, the toner adheres to the drum on the areas which have
been irradiated by the laser beam and so creates a visible image.
March 2000 © TOSHIBA TEC
OPC drum
Fig. 5-3-22
Doctor blade
Toner
Sleeve roller
5-23 DP120F/DP125F Mechanical Description
Magnetic roller
05-03-22