40718401TH Rev.5 17 /2.2 Power Supply/Sensor BoardThe power supply/sensor board consists of an AC filter circuit, a low voltage power supply circuit, a highvoltage power supply circuit, heater drive circuit, and photosensors.(1) Low Voltage Power Supply CircuitThis circuit generates the following voltages.(2) High Voltage Power Supply CircuitThis circuit generates the following voltages required for electrophotographic process from +5 V,according to the control sequence from the main control board. When cover open state is detected,+5 V supply is interrupted automatically to stop the supply of all high-voltage outputs.Output voltage Use+5 V+38 V+8 V–8 V+3.3VLogic circuit supply voltageMotor and fan drive voltage and source voltage for high-voltage supplyRS-232C line voltageRS-232C line voltage and PS board supply voltageLED head supply voltage(3) PhotosensorThe photosensor mounted on this power supply/sensor board monitors the status of paper beingfed through the printer during printing.Output Voltage Use RemarksCHDBSBTRCBVoltage applied to charging rollerVoltage applied to developing rollerVoltage applied to toner supply rollerVoltage applied to transfer rollerVoltage applied to cleaning rollerVariable-1.3 KV-265 V/+300 V-500 V/ 0 V+500 V to +3.5 KV/-1100 V+400 V/-1350 V
