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Toner Cartridge / Developing Unit Main Unit Theory of Operation
2-32
II Composition/Operation
7.2.3 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 Developing
Roller. The AC component of the developing bias voltage is applied only during devel-
opment. At any time other than the development, only the DC component of the devel-
oping bias voltage is applied.
5. Toner sticks to the Photo Conductor when the AC component of the developing bias
voltage (Vpp) is negative. The time length of the negative component (Vpp) determines
the image density.
6. A negative charge (charge neutralizing bias voltage: same potential as the developing
bias) is applied to the Charge Neutralizing Sheet to neutralize any toner left on the sur-
face of the Developing Roller. The neutralized toner is returned to the Supply Roller.
4138to2018c2
Photo Conductor
Regulator Blade/2nd
Regulator Blade/1st
Developing Roller
Supply Roller
Charge Neutralizing Sheet
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