COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001CHAPTER 4 IMAGE FORMATION SYSTEM4-9 P3 Controlling the Transfer Charging Roller Bias3.1 OutlinePart 2>Chapter 5>7.8.3 “Controlling the Transfer Roller Charging”The machine’s transfer charging is a direct charging method that uses a transfer chargingroller. A DC bias is applied to the transfer charging roller.The following relate to the transfer charging system:[1] Turning on/off the bias.[2] Controlling the DC bias to a specific voltage/current level.[3] Controlling the detection of transfer charging roller resistance (ATVC control)[4] Controlling the output by operation mode[5] Controlling the output by the environment sensor (humidity)F04-301-01DC controller PCBTransferchargingoutput enablesignal Cleaningbias outCleaning bias outputON signalTransfer outputmode signal 4Transfer bias outputON signalTransfer biasoutput controlsignalJ301-B9J136-B4J135-B8 -B5J301-A3-A1J136-A10-A1224 VDC input frommain power supplyComposite power supply PCBPW-CPUTransformer drivesignalT133-B5 -B8-B6 -B7-B7 -B6Transformer drivesignalPhotosensitivedrumTransfer biashigh-voltagetransformer(T133)Transfer cleaningbias high-voltagetransformer(T506)TransferbiasoutputTransfercharging rollerVoltagedetectionVoltage level(ATVC measurement result)+24VEnvironmentsensor(humidity)Measurement resultJ302-B14SerialcommunicationPrint/standby mode signalTransfer bias output dataATVC measurement dataDrivecontrolCurrentdetectionCurrentlevelTransfer outputmode signal 3Transfer outputmode signal 2Transfer outputmode signal 1Transfer bias outputcurrent switching signal
