Cleaning; Transfer Roller Cleaning Mechanism; Separation Mechanism; Controlling The Static Eliminator Bias - Canon iR3570 Service Manual

Transfer bias for cleaning: -2600 V
The transfer bias is used at time of image formation, while a voltage of a specific level is applied between sheets for cleaning of the transfer roller.

7.9.3 Cleaning

7.9.3.1 Transfer Roller Cleaning Mechanism

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The machine uses the transfer roller cleaning mechanism to return the toner sticking to the transfer roller back to the photosensitive drum by applying a cleaning
bias to the roller.
Once the toner reaches the drum, it is scraped by the photosensitive drum cleaning blade for collection in the waste toner box.

7.9.4 Separation Mechanism

7.9.4.1 Controlling the Static Eliminator Bias

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
Static Eliminator Bias
1st side: -2300 V
2nd side: -3000 V
A DC bias is applied between sheets while an image is being formed. (It is applied until the ongoing job is over.)

7.10 Transfer Mechanism

7.10.1 Transfer Guide Bias

7.10.1.1 Transfer Guide Bias Control

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
To prevent soiling of the transfer guide with toner or the photosensitive drum with toner images, the following transfer guide bias is applied to the transfer guide.
The surface of the transfer guide is covered with an insulating sheet.
Transfer guide bias
1st side: -570 V
2nd side: -740 V

7.11 Photosensitive Drum Cleaning

7.11.1 Outline

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The photosensitive drum cleaning mechanism uses the photosensitive drum cleaning blade to scrape off the residual toner left behind from transfer; the toner thus
collected is moved to the waste toner box.

7.11.2 Collection of Waste Toner

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The waste toner scraped off by the cleaning blade is moved by the waste toner feedscrew to the waste toner box found at the front of the machine. The waste toner
feedscrew is operated by the drive from the drum flange.

7.11.3 Checking the Waste Toner Box

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
To prevent leakage of waste toner from the waste toner box or to prevent overloading the waste toner feedscrew, the machine is equipped with a waste toner detec-
tion mechanism. The waste toner box can hold about 2043 cc of toner, and the machine identifies the waste toner box as being full when there is about 1766 cc of
toner or when the toner comes to weigh about 1050 g.
When the weight of waste toner increases, the waste toner case itself lowers on its own, thus causing the machine to assume that the case has become full.
Chapter 7
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