Controlling The Transfer Charging Roller Bias; Outline - Canon iR1600 Series Service Manual

CHAPTER 5 IMAGE FORMATION SYSTEM

4 Controlling the Transfer Charging Roller Bias

4.1 Outline

The machine uses a charging roller for charging (direct charging method), and it applies
a DC bias to the transfer charging roller.
The machine's transfer charging mechanism is controlled for the following:
[1] turning on and off the bias.
[2] controlling the DC bias to a specific voltage/current level.
[3] correcting the voltage level (ATVC control)
The following shows the system used to control the transfer charging mechanism:
DC controller PCB
TRPWM*
ASIC
TRPFOT*
TRCHG
TRNFOT*
CPU
5 - 8
COPYRIGHT© 2002 CANON INC.
Transfer bias circuit
Comparison
circuit
Constant current/
voltage switch circuit
TRCRNT
F05-401-01
2000
Positive current
detection circuit
Voltage
detection circuit
Superimposition
Negative voltage
generation circuit
CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002
Tr T403
To transfer
charging roller