Charging Mechanism; Controlling The Primary Charging Bias; Primary Charging Roller Cleaning Mechanism; Drum Cleaner Unit - Canon iR3245 Series Service Manual

Chapter 7

7.5.2 Charging Mechanism

7.5.2.1 Controlling the Primary Charging Bias

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
The primary charging bias consists of AC and DC components.
These AC and DC biases are applied between sheets while an image is being formed (until the end of the ongoing job).

7.5.2.2 Primary Charging Roller Cleaning Mechanism

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
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

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
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.
7-10
AC bias: 2700 Vp-p (max.)
DC bias: -450 V to -850 V
[1]
[2]
[3]
F-7-11
[4]
0018-9709
0018-9710
0018-9712