Pre-Exposure Control - Canon imageRUNNER ADVANCE C5500 Series Service Manual

Pre-exposure Control

In order to reduce ghosting due to residual charge, this machine performs pre-exposure to return the drum potential to 0V to
prevent unevenness in the primary transfer.
Note that this machine does not control the light intensity of the pre-exposure according to environmental and other factors. (The
output current can be adjusted by using service mode.)
N Name
o
1 Photosensitive Drum
2 Residual charge
3 Drum Cleaning Pre-Expo-
sure LED
4 Cleaning Screw
5 Cleaning Blade
Drum Cleaning Pre-exposure
Residual charge is removed from the Photosensitive Drum surface by emitting light from the Pre-exposure LED.
Ghost images, etc. are reduced by removing residual charge because this reduces potential differences in the charging process
of the next process.
Drum cleaning
The Cleaning Blade, which is in contact with the Drum, cleans residual toner on the Photosensitive Drum.
Next, residual toner is fed to the Waste Toner Container by the rotation of the Cleaning Screw.
Related Service Mode
Adjustment of the pre-exposure LED current for each color:
( Level 2 ) COPIER > Adjust > EXP-LED > PR-EXP-Y
( Level 2 ) COPIER > Adjust > EXP-LED > PR-EXP-M
( Level 2 ) COPIER > Adjust > EXP-LED > PR-EXP-C
( Level 2 ) COPIER > Adjust > EXP-LED > PR-EXP-K
[1]
After a static latent image has been formed on the Photosensitive Drum, a toner image is formed with
the toner from the Developing Cylinder.
Residual charge remaining on the Photosensitive Drum surface.
Residual charge remaining on the Photosensitive Drum surface is removed.
Residual toner that has been removed by the Cleaning Blade is fed.
Residual toner on the Photosensitive Drum is removed.
[2]
[3]
[4]
[5]
Roll
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2. Technology