Xerox Phaser 6000 Service Manual page 65

Phaser 6000/6010 and WC 6015 MFP
Development
In the developer section, incoming toner is mixed with the existing developer
(toner/carrier mixture) by the auger, and then supplied to the magnet roller
located near the drum surface. The toner and carrier are charged by friction due to
agitation (toner in negative, carrier in positive), and they attract each other
electrically. The carrier, due to its magnetic properties, is attracted to the magnet
roller, and then uniformly leveled by the trimmer rod.
: Positive Electric Charge
: Negative Electric Charge
: Toner
: Carrier
Xerographic Developer Assembly
Magnet Roller
HVPS
Drum Surface
The magnet roller is covered by a thin semi-conductive sleeve all over the surface.
The DB (Developing Bias) voltage is supplied to this semiconductor sleeve from the
HVPS. The DB voltage is negative DC voltage combined with AC voltage. The DC
voltage keeps the magnet roller at a constant negative voltage against the
photoreceptor layer of the drum. Therefore, at the area where the negative electric
charge on the drum surface does not decrease, the potential is lower than that of
the magnet roller, while the potential is higher than that of the magnet roller at
the area where the negative charge on the drum surface decreases. The AC
voltage shakes the developer on the surface of the magnet roller so that the toner
easily flies to the drum.
Xerox Internal Use Only
Drum
Trimmer Rod
Auger Auger
Electric Potential
Toner Image
Theory of Operation
Toner Cartridge
Auger
On Drum
Developing
Bias
s6000-059
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