Sweeper stripWaste toner containerPhotosensitivedrumCleaning bladeControls■ High-voltage power supply control● OverviewThe high-voltage power supply PCBs are to apply high-voltage bias to the primary charging roller, the primary transfer pad, thesecondary transfer external roller, and the ITB cleaning unit. Such high-voltage bias is generated through control by the DCcontroller on the high-voltage power supply PCBs.The figure below shows the high-voltage power source schematically.Type Bias applied Purpose Applied toPrimary charging bias DC negative Charge the photosensitive drum surface negatively. Primary charging roller (car-tridge)Developing bias DC negative Deposit toner on the static latent image formed on thephotosensitive drum.Developing cylinder (cartridge)Blade bias DC negative Adjust the charged toner amount on the developing cylin-der.Developing blade (cartridge)Primary transfer bias DC negative Transfer the toner image on the photosensitive drum to theITB.Developing blade (cartridge)Secondary transfer bias DC positive Transfer the toner image on the ITB to the paper. Secondary transfer external roll-erDC negative Clean the secondary transfer external roller.ITB cleaning brush bias DC positive Charge the toner on the ITB positively. ITB cleaning brushITB cleaning roller bias DC positive Charge the toner on the ITB positively. ITB cleaning roller2. Technical Explanation35
