Xerox WORKCENTRE 3210

WorkCentre 3210/3220 Multifunction Printer Service Manual 2-23
Theory of Operation
Transfer High Voltage (THV+)
The (+) Transfer High Voltage is supplied to the Transfer Roller for transferring
toner onto the OPC Drum to the paper.
■ Input Voltage: 24 VDC ± 15%
■ Output Voltage: MAX +5.0KV ± 5% (duty variable)
■ Line Regulation: under ± 3% (fluctuation input 21.6 V~27.6 V)
■ Output Voltage Rising Time: 50 ms Max
■ Output Voltage Falling Time: 100 ms Max
■ Fluctuating Transfer Voltage with Environmental Various: 0 V~5 KV
■ Environment Recognition Control Method: The THV-PWM ACTIVE is
transfer active signal. It detects the resistance by recognizing the voltage
value, F/B, while permits the environmental recognition voltage.
■ Output Voltage Control Method: Transfer Output Voltage is outputted and
controlled by changing duty cycle of THV/PWM signal.
Charge Voltage (MHV)
High voltage is supplied to the OPC drum through the charging roller while
charging the skin of the OPC drum.
■ Input voltage: 24 VDC ± 15%
■ Output voltage: -1.2 KV ~ -1.8 VDC ± 3%
■ Output voltage rising time: 50 ms Max
■ Output voltage failing time: 50 ms Max
■ Output control signal (MHV-PWM): CPU is HV output when PWM is Low.
Cleaning Voltage (THV-)
■ -1.2 KV ± 15%
■ The (+) transfer voltage is not outputted because the THV PWM is
controlled with high.
■ The (-) transfer voltage is outputted because the THV-Enable Signal is
controlled with low.
■ The output fluctuation range is large because there is no feedback control
and connection resistor.