Brother International HL-2400C Service Manual - Page 58

(2) Variation of OPC Belt Potential (See Fig.4-10.) i) The OPC belt is initially biased to -CBV(V). ii) The OPC belt surface is evenly charged to V0(V) in the charging process. iii) The potential of the exposure part of the OPC belt is reduced to -VR(V) as it is exposed to the laser beam in the process of exposing, and an electrostatic latent image is formed on the OPC belt as the result. iv) Negatively charged toner is moved onto the exposed part of the OPC belt in the development process due to the difference of potential between -VR(V) (the latent image) and -DBV(V), and a visible toner image is formed as the result. v) Negatively charged toner on the OPC belt moves to the transfer drum surface in the transfer process because the GND potential of the transfer drum is greater than -VR(V) of the OPC belt. vi) The OPC belt is discharged by the erase lamp. Process 1 2 34 5 Transfer Drum GND OV OPC Belt - CBV - VR DBV - VO Charger CBV CHV Toner Toner Dev. roller 1 Charging Process 2 Exposing Process 3 Developing Process 4 Transfering Process 5 Cleaning (Erase) DBV CBV Power Supply for OPC Belt Bias CHV Power Supply for Charging DBV Power Supply for Mag Roller Bias - VR Remain voltage on the OPC Belt Fig.4-10 IV-9