Turning On And Off The Bias; Dc Bias; Ac Bias; Bias Constant Voltage/Constant Current Control - Canon iR1600 Series Service Manual

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2.2 Turning On and Off the Bias

The primary charging roller bias is turned on and off as follows:

The DC bias is generated when the primary DC bias drive signal (PRDCFOT*) goes

ON. The level of the DC bias is controlled by the primary/developing DC bias output level

signal (DCPWM*).

The AC bias is applied when the primary AC bias drive signal (PRACFOT*) goes ON

and the primary AC bias ON/OFF signal (PRACON*) goes '0'.

The output levels of the DC and AC biases applied to the primary charging roller are

controlled as follows:

The output voltage level f the DC bias is detected by the bias voltage detection circuit,

and is fed back to the DC generation circuit by way of the comparison circuit. The ASIC

on the DC controller PCB varies the pulse width of the primary/developing DC bias out-

put level signal as needed to ensure that the voltage of the DC bias remains at a specific

The output current level of the AC bias is detected by the primary AC bias current cir-

cuit, and is fed back to the AC generation circuit by way of a comparison circuit. The AC

generation circuit varies the amplitude of the primary AC bias ON/OFF signal as needed

to ensure that the current of the AC bias remains at a specific level.

CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002

CHAPTER 5 IMAGE FORMATION SYSTEM

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