Developing System - Konica Minolta bizhub 160 Service Manual

7. IC (Imaging Cartridge) section
7.3

Developing System

• The 1st Toner Blade located above the Sleeve Roller spreads a thin, even coat of toner
over the Sleeve Roller.
• A negative charge is applied to the 2nd Toner Blade, which negatively charges the toner.
• The Sleeve Roller is negatively charged, which retains the toner thereon.
• The toner sticks to the area on the surface of the PC Drum that has been exposed to the
laser beam.
• The Bias Seal on the underside of the Sleeve Roller separates toner, which has not been
attracted onto the surface of the PC Drum, from the Sleeve Roller and returns it back to
the Toner Hopper. The same bias as that applied to the Sleeve Roller is applied to this
Bias Seal, thereby preventing toner from falling.
• The developing bias automatically adjusts the print image density over a range of seven
steps through feedback control. A bias voltage, reversed from the developing bias, is
applied before a print command is issued, before predrive, and during predrive, to pre-
vent toner from sticking to the surface of the PC Drum.
2nd Toner Blade
1st Toner Blade
Toner Blade Voltage
Terminal
Toner Supply Roller
22
Theory of Operation Ver. 1.0 Apr. 2005
PC Drum
Developing
Voltage Terminal
Developing Lower Seal (Bias Seal) Terminal
0992S24
Developing Lower Seal (Bias Seal) Terminal
Developing Voltage Terminal
Toner Blade Voltage Terminal
Sleeve Roller
Bias Seal
4136M505AA