Brother International MFC-P2000 Service Manual - Page 37
Photosensitive Drum, Corona wire, Development Roller, Transfer Roller, Cleaning Roller, Erase Lamp
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2.2.3 Drum Unit 1) Photosensitive Drum Generates the latent electrostatic image and develops the image on the drum surface. 2) Primary Charger Forms a uniform charge on the drum surface. (a) Corona wire Generates the ion charge on the drum. (b) Grid Spreads the ion charge evenly over the drum surface. 3) Development Roller Develops the latent electrostatic image on the drum surface by the addition of the toner. 4) Transfer Roller Transfers the toner image to the paper from the drum surface. 5) Cleaning Roller Removes and recycles the toner remaining on the drum surface. 6) Erase Lamp Discharges the electrostatic latent image on the drum. 2.2.4 Print Process 1) Charging The drum is charged to approx. +1150V by an ion charge which is generated by the primary charger. The charge is generated by ionization of the corona wire, which has a DC bias from the high-voltage power supply applied to it. The flow of the ion charge is controlled by the grid to ensure it is distributed evenly on the drum surface. The drum sleeve is regulated to approx. 280V by the voltage regulator. 280V Passive Type Voltage Regulator Voltage Regulator +++-+--+--+- 1150V - + -- - ++ + - + + + + + + + ++ + + Corona wire Aluminum drum sleeve Organic Photoconductor layer Grid HVPS Drum Fig. 2-26 The primary charge uses a corona wire, but since the drum is positively charged, only less than 1/10 of the usual quantity of ozone is generated compared with the negatively charged drum. The level of ozone expelled from the printer is therefore not harmful to the human body. Applicable safety standards have been complied with. II-18
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