Primary Charging Roller Cleaning Mechanism; Drum Cleaner Unit; Photosensitive Drum Cleaning; Developing Unit - Canon iR3570 Service Manual

These AC and DC biases are applied between sheets while an image is being formed (until the end of the ongoing job).

7.5.1.2 Primary Charging Roller Cleaning Mechanism

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The machine uses a brush [3] to clean the primary charging roller [2], which remains in contact with the photosensitive drum [1]. The brush has a reciprocating
mechanism and is driven by a cam [4], operating while the photosensitive drum is being driven.

7.6 Drum Cleaner Unit

7.6.1 Photosensitive Drum Cleaning

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The cleaning blade is kept in contact with the surface of the photosensitive drum. It serves to scrape off the residual toner left behind from transfer to paper for
collection in the waste toner box.

7.7 Developing Unit

7.7.1 Controlling the Developing Bias

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
Developing Bias
Both these AC and DC biases are applied while an image is being formed, but are not applied between sheets.
DC bias -450 V to -850 V
AC bias 800 Vp-p
DC bias -450 V to -650 V
[1]
[2]
[3]
F-7-13
T-7-9
[4]
Chapter 7
0006-5992
0007-5224
0006-6032
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