Developing Bias; Developing System - Konica Minolta magicolor 2490MF Service Manual

Theory of operation ver. 1.0 July. 2006
12.2.3

Developing bias

• The developing bias voltage (Vb) is applied to the developing roller so that an adequate
amount of toner is attracted onto the surface of the photo conductor.
• To allow toner to fly to the photo conductor easily, DC (-) + AC developing bias voltage
(Vb) is applied to the developing roller during development. This AC component of the
developing bias voltage is applied only during development. At any time other than the
development, only the DC (-) component of the developing bias voltage is applied.
• The developing bias voltage (Vb) is supplied by the high voltage unit.
Developing Bias Contact Point
12.2.4

Developing system

• The machine employs the single-component, non-contact developing system.
• In the non-contact, single-component developing system, the magnetic brush does not
rub the surface of the photo conductor (or the image). This prevents a foggy image from
occurring and the photo conductor from being worn.
Developing Roller
Seal Bias Contact Point
Regulator Blade Contact Points
12. Developing section
4139to2062e0
Photo Conductor
4139to2063e1
31