Developing System - Konica Minolta bizhub C35 Service Manual

DRAFT
13. IMAGING UNIT SECTION (developing)
13.3.2

Developing system

• Two types of developing systems are used, a non-contact developing system and an
alternating current application system.
1. A negative charge (supply bias voltage Vr) is applied the supply roller to regulate
the amount of toner sticking to the developing roller.
2. A negative charge (blade bias voltage Vb1) is applied to the regulator blade/1st to
negatively charge the toner and form a thin layer of toner.
3. Toner on the surface of the developing roller is evened out by the regulator blade/
2nd.
4. During development, DC + AC developing bias voltage (Vb) is applied to develop-
ing roller. The 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.
5. The developing roller causes the toner to stick to the photo conductor when the AC
component of the developing bias voltage is negative. The voltage and time length
of the negative component determine the image density.
6. A negative charge (charge neutralizing bias voltage: same potential as the develop-
ing bias) is applied to the charge neutralizing sheet to neutralize any toner left on
the surface of the developing roller. The neutralized toner is returned to the supply
roller.
Supply roller
Developing roller
Regulator blade/1st
Regulator blade/2nd
Charge roller bias
Regulator blade bias
38
Charge neutralizing sheet
Developing roller bias
Theory of operation Ver. 1.0 Feb. 2010
Photo conductor
Supply roller bias
A0VDT2C524AA
A0VDT2C612AA