Chapter 66-86.8 Transfer Unit6.8.1 Outline of the Transfer Unit6.8.1.1 Outline 0017-4355The transfer unit consists of a transfer roller [1] and an static eliminator [2].The transfer roller is driven by the photosensitive drum.The static eliminator is biased to separate paper from the drum.F-6-126.8.2 Controlling the Transfer Bias6.8.2.1 Transfer Roller Bias Control 0017-4356A negative bias, sheet-to-sheet bias, or positive bias is applied to the transfer charging roller according to the type of sequence.The negative bias is applied at the prescribed timing to moves the toner from the transfer charging roller to the photosensitive drum for cleaning.The sheet-to-sheet bias is lower than that applied during printing and it is applied at the prescribed timing to prevent the toner remaining on the photosensitive drumfrom adhering to the transfer charging roller.The positive bias is applied to transfer toner images from the photosensitive drum to paper.F-6-13[1][2]Tr3TRCRNT/TRPWMTo transfercharging rollerTransfer bias circuitASICCPUPositive currentdetection circuitPositive voltagegeneration circuitNegative voltagegeneration circuitComparisoncircuit/TRPFOTTRCHG/TRNFOTSuperimpositionConstant current/voltageswitching circuitHigh-voltage power supply PCBDCcontrollerPCB
