Phaser 6128MFP Service Manual
2-7
Theory of Operation
Development
Toner is electrically attached to the invisible electrostatic latent image on the drum
surface to form the visible toner image on the drum.
The toner in the Toner Cartridge is agitated by the built-in agitator and fed into
the developer. The augers are driven by the Toner Motor and the developer motor
in the Main Drive. The toner to be consumed according to the print count is
calculated and fed into the developer. This process, called toner dispensation, is
controlled by two processes: pixel count dispense control (PCDC) and automatic
density control (ADC).
The toner fed into the developer and the carrier in the developer are agitated by
the auger, and supplied to the magnet roller arranged in the drum surface area.
The toner and carrier are charged by friction due to agitation (toner in negative,
carrier in positive), and they are attracted electrically. A uniform layer is formed by
the trimmer bar as the carrier magnetic substance is attracted to the magnetic
roller.
The magnet roller is covered by a thin semi-conductive sleeve. The developer bias
voltage is supplied to the sleeve by the HVPS. Developer bias is negative DC
voltage combined with AC voltage. The magnet roller is kept at constant negative
voltage against the photoreceptor layer of the drum by DC voltage. Therefore, at
the area on the drum surface where the negative electric charge does not
decrease, potential is lower than the magnet roller, while the potential is higher
than the magnet roller at the area where the negative charge on the drum surface
decreases. The AC voltage shakes the developer on the magnet roller surface,
causing the toner to transfer to the drum.
Thus, the negatively charged toner is attracted only to the area on the drum
surface (electrostatic latent image) where the negative charge is lower than the
charge on the magnet roller, forming the toner image on the drum. Once the toner
adheres to the drum, the negative charge of the toner-bearing location increases,
which decreases the potential and the toner-attracting force.
HVPS
s6128-006
: Negative Electric Charge
: Positive Electric Charge
: Toner
: Carrier
Trimmer Rod
Paddle
Toner Cartridge
Auger
Auger
Magnet Roller
Agitator
Drum
Summary of Contents for Phaser 6128 MFP
Page 1: ...Phaser 6128MFP Multi Function Printer Phaser 6128MFP Service Manual ...
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Page 54: ...1 30 Phaser 6128MFP Service Manual General Information ...
Page 120: ...2 66 Phaser 6128MFP Service Manual Theory of Operation ...
Page 270: ...3 150 Phaser 6128MFP Service Manual Error Messages and Codes ...
Page 408: ...5 62 Phaser 6128MFP Service Manual Print Quality Troubleshooting ...
Page 420: ...6 12 Phaser 6128MFP Service Manual Adjustments and Calibrations ...
Page 424: ...7 4 Phaser 6128MFP Service Manual Cleaning and Maintenance ...
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