Drum cleaning stage
Not all of the toner is removed from the photosensitive drum during the transfer stage. During the cleaning
stage, the residual, or waste, toner is cleared from the drum surface to prepare the surface for the next
latent-image formation.
Step 9: drum cleaning
The cleaning blade scrapes the residual toner off the surface of the photosensitive drum and deposits it in
the waste-toner container. The drum is now clear, and is ready for the next image-formation process.
Figure 1-19 Drum cleaning
Developing roller engagement/disengagement control
The developing roller engagement/disengagement control engages the required developing roller with the
photosensitive drum according to the print mode—full-color mode or monochrome mode.
The necessary developing roller is engaged with the photosensitive drum only when required, preventing a
deterioration of the drums and making maximum use of the life. The engagement/disengagement of the
developing roller is controlled by the DC controller rotating the main motor and changing the direction of the
developing disengagement cam. The DC controller controls the developing roller state, whether engaged or
disengaged, by counting the main motor rotation after it detects the signal from the developing home-
position sensor.
All four color developing rollers disengage from the photosensitive drums when the product is turned on and
when a print operation is completed. The color developing rollers engage with the photosensitive drums
when the full-color mode is designated. Only the black developing roller engages with the photosensitive
drum when the monochrome mode is designated.
The DC controller determines an abnormality of the developing roller engagement/disengagement function
and notifies the formatter when it does not sense the signal from the developing home-position sensor for a
specified period during the developing roller engagement/disengagement operation.
22 Chapter 1 Theory of operation ENWW
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