6 – 3Chapter 6 Principles of OperationVersion 1 2007.12.281.3 Description of Printing Process Techniques1.3.1 Charging with electricityIn the charging process, the drum surface rotating at a constant speed is charged uniformly withnegative electricity by the discharge from BCR (Bias Charge Roll).This process is performed in parallel for yellow, magenta, cyan and black colors.- The BCR is kept in contact with the drum and rotates following the rotations of the drum.BCR is a conductive roll, receives discharge voltage from the High Voltage Power Supply (HVPS)and discharges a negative DC voltage.- The drum surface is uniformly and negatively charged with DC bias voltage.The drum surface is a photoreceptor (which is an insulator in the dark and a conductor in the light)and the drum inside is composed of a conductor.- The Cleaning Roll is a sponge, which contacts with the BCR to catch the toner.Kmy06003KBengine principle0005FA engine principle0006FA
