Drum-Related Issues - Canon imageRUNNER ADVANCE 6075 Series Service Manual

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Technology > Image Formation System > Controls > Drum-related Issues

■ Drum-related Issues

● Drum HP Detection
To detect home position of the Photosensitive Drum.
There is a flag for HP detection on the shaft of the Photosensitive Drum. Once the
Photosensitive Drum starts rotating, the flag passes through the Drum HP Sensor (PS61) and
the home position of the Photosensitive Drum is detected.
This control is used during the 2D shading control.
Photosensitive Drum
Flag
Drum Home Position Sensor(PS61)
2 Technology > Image Formation System > Controls > Drum-related Issues
● Drum Heater Control
To make potential characteristic for charging or exposure stable by keeping the specified
temperature of the Photosensitive Drum.
The Drum Heater is the flat heater located inside the Photosensitive Drum to keep moisture
content on the surface of the Photosensitive Drum constant by turning ON the heater.
NOTE:
Temperature of the drum is detected by the Thermistor in the Drum Control PCB, and
is controlled by turning ON/OFF the Drum Heater to make it 42 degC
Environment
F-2-93
Heater
Switch
Photosensitive Drum
Drum Heater
Environment Sensor
2-65
F-2-94
2-65