Xerox WorkCentre 3210 Service Manual page 79

WorkCentre 3210/3220 Multifunction Printer Service Manual
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.
Theory of Operation
2-23