Developing - OKIDATA OF1000 Service Manual

Page: 54
Service Guide OF1000
Chapter 2 Principles of Operation

2.5.06 Developing

The electrostatic latent image formed on the image drum surface is developed into a visible image.
Developing takes place when contact is made between the image drum and the developing roller.
As the toner supply roller rotates, toner is absorbed into the sponge type roller material.
A charged particle will be attracted to a particle having a MORE POSITIVE charge than its own.
The developing roller surface is charged to -300 vdc and the toner supply roller is charged to -450 vdc.
Since the development roller is charged more positive than the toner supply roller, the toner on the toner
supply roller is attracted to the developing roller. The toner on the developing roller contacts the doctor
blade, forming a thin coat of toner on the developing roller surface.
The exposed portion of the image drum contains a more positive charge than the development roller (-100
vdc vs -300 vdc). Therefore, toner is attracted to the exposed areas of the image drum, making the
electrostatic latent image visible.