Drum Heater Control; Drum Rotation Speed Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2

Drum heater control

The drum heater is attached below the photosensitive drum to keep stabilized charging and
exposure according to the environmental change in the machine.
This heater works only when the main power switch is turned OFF while the environment
switch is turned ON.
Photosensitive
Drum heater
2
drum
F-2-84 F-2-84

Drum rotation speed control

This control is performed to keep a uniform drum rotation speed in order to increase accuracy
of the image position (color displacement).
Execution timing
1) The drum rotates, driven by the drum motors (M1 to M4).
2) There is an encoder on the drum shaft, of which rotation is monitored by the two sensors (Y:
UN31/32, M: UN33/34, C: UN35/36, Bk: UN37/38,).
3) This sensor counts the drum count based on a pulse, and feeds back the drum rotation
speed to the drum DC controller to perform speed control.
Drum motor
(M1~M4)
DC controller (UN1)
2-52
Photosensitive drum
Drum rotation sensor2
(UN32 / 34 / 36 / 38)
Drum rotation sensor1
(UN31 / 33 / 35 / 37)
F-2-85 F-2-85
2-52