Controls; Drum Unit - Canon imageRUNNER 2530 Service Manual

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Technology > Image Formation System > Controls > Drum Unit

Controls

Drum Unit

The drum unit mainly consists of the photosensitive drum, primary charging roller, brush roller,
cleaning blade, and waste toner feed screw, and is driven by the main motor (M1).
Cleaning blade in contact with the photosensitive drum scrapes off the residual toner on its
surface without being transferred to a paper. The residual toner scraped off by the cleaning
blade is fed from the toner ejection part into the waste toner box by the waste toner feed
screw. The primary charging roller is cleaned by the brush roller in contact with it.
Cleaning Blade
Brush roller
Toner ejection part
Primary charging roller
M1 Main motor
[1] Main motor drive signal
2 Technology > Image Formation System > Controls > Drum Unit
Waste toner feed screw
M 1
Photosensitive drum
[1]
DC Controller PCB
F-2-59 F-2-59
Primary Charging Bias Control
The machine is directly charged by the charging roller. DC bias and AC bias that stabilized
the charge is applied to the primary charging roller.
Primary charging roller
HVT PCB
Environment sensor
[2] [1]
Primary AC bias
control circuit
DC Controller PCB
[1] Primary charging bias control signal
[2] Environment sensor detection signal
Constant voltage control of DC bias and AC bias
The DC bias and AC bias control circuits on the DC controller PCB control the DC bias and
AC bias applied to the primary charging roller to keep their voltage at the fixed level.
DC bias switch control
The DC bias output varies according to the environment detected by the environment sensor
(HU1).
2-37
Photosensitive drum
Primary DC bias
control circuit
F-2-60 F-2-60
2-37