Separation Bias Control; Drum-Related Issues; Drum Hp Detection - Canon imageRUNNER ADVANCE 8105 Series Service Manual

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Technology > Image Formation System > Controls > Drum-related Issues
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Separation Bias Control

To prevent image soil caused by toner accumulated on the Drum Separation Claw, this
control prevents attachment of toner on the Photosensitive Drum with the Drum Separation
Claw.
<Execution timing>
When the developing bias is applied
The separation claw bias (AC), which has been generated on the Develop High Voltage PCB
(PCB12), is applied to the Separation Claw so that vibration is given to the Separation Claw
to prevent toner attachment.
The bias value is fixed.
Developing High Voltage PCB(PCB12)
AC
Separation Claw
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Technology > Image Formation System > Controls > Drum-related Issues
Photosensitive Drum
F-2-93 F-2-93
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Drum-related Issues

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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 D-max control, the D-half control and the 2D shading control.
Photosensitive Drum
Flag
Drum Home Position Sensor(PS61)
2-66
F-2-94 F-2-94
2-66