Controlling The Output By Operating Mode; Types Of Modes - Canon iR2200 Service Manual

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3.4 Controlling the Output by Operating Mode

The transfer charging output may be any of the following output modes, and the output is

varied to suit each mode. The switch-over among these is based on the combination of trans-

fer output mode signals from the DC controller PCB.

a. Image Transfer Bias

This bias is used to transfer toner from the photosensitive drum to paper, and is a positive

b. Cleaning Bias

This bias is used to return toner sticking to the transfer charging roller to the photosensi-

tive drum, and applies a negative voltage.

During initial rotation after the Start key is pressed

During last rotation

During initial rotation after jam removal or error resetting

During execution of roller cleaning in user mode ('adjust/clean'; in this case, the pri-

mary charging roller is also cleaned)

c. Reference Bias

It is an application voltage used for the transfer charging roller resistance detection con-

trol (ATVC control) mechanism. For every 1,000 prints (cumulative) or when 'roller clean' is

executed in user mode ('adjust/clean'), the voltage is applied at time of last rotation.

d. Sheet-to-Sheet Interval Bias

This bias is used in a non-image area (between sheets) in continuous print mode; the bias

level is reduced to prevent adhesion of toner to the transfer charging roller.

Indicates the presence of a high-voltage (primary charging, transfer charg-

ing, development) output fault.

2000 2000 2000 2000

CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001

CHAPTER 4 IMAGE FORMATION SYSTEM

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Ir2800 Ir3300