Development - Oki B6100 Technical Manual

3. Development

The toner in the CRU has a slight magnetic property that causes it to adhere to the Magnetic Roll. The
Charge Metering Blade (CM Blade) spreads the toner into a very thin layer on the Magnetic Roll. Fric-
tion between the Magnetic Roll and the CM Blade generates a small electrical charge that is trans-
ferred to the toner.
The surface of the Magnetic Roll is made up of a thin sheet of conductive material. The PWBA HVPS
supplies the Magnetic Roll with two voltages; a negative DC voltage and an AC voltage . The DC volt-
age is the voltage that is used to transfer toner from the Magnetic Roll to the surface of the drum. The
AC voltage agitates the toner on the Magnetic Roll and makes toner transfer easier.
The Magnetic Roll maintains an electrical potential qrelative to the charged surface of the drum. Nega-
tive charged areas of the drum have a lower electrical potential, or higher relative negative value, than
the Magnetic Roll. Discharged areas of the drum have a higher electrical potential, or lower relative
negative value, than the Magnetic Roll. A discharged point on the surface of the drum now appears
less negative, or positive, relative to the negative charge on the Magnetic Roll.
The toner adhering to the Magnet Roll is always in contact with the drum surface. When a less nega-
tive point on the drum (a discharged area) comes in contact with the more negative charged toner on
the Magnet Roll, toner transfers from the Magnet Roll to that point on the drum. At this point there is
now a visible toner image on the drum surface.
OKI B6100 Laser Printer - Base Engine Technical Manual
Version 1.0
Figure 4. Side view block diagram of the development process
Principles of Operation
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