Developing System - Konica Minolta A00F011 Service Manual

Theory of operation Ver. 1.0 Nov. 2007
12.2.4

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. Toner sticks to the photo conductor when the AC component of the developing bias
voltage (Vpp) is negative. The voltage and time length of the negative component
(Vpp) determines 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 corona
Charge neutralizing sheet
A011T2C024DB
Charge neutralizing sheet/ Developing roller bias
Grid mesh
A011T2C025DA
12. Print unit section (developing)
Photo conductor
Supply roller bias
Regulator blade bias
33