Fixing Block; Drum Cleaning Block - Canon imageCLASS MF4890dw Service Manual

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Technical Overview > Image Formation System > Overview/Configuration > Drum Cleaning Block
Step 5: Separation
In this step, DC negative bias is applied to the static eliminator according to the elasticity of
papers to separate the papers from the photosensitive drum. The static eliminator is used to
stabilize the paper feed system (prevention of toner stray that appears as polka-dots on print
images in a low-temperature, low-humidity environment), and neutralizes the electric charge
at the back of papers.
Photosensitive
Static charge eliminator

■ Fixing Block

This block applies pressure and heat to papers and the toner on them to fix toner images to
the papers.
Step 6: Fixing
This step employs on-demand fixing that fixes toner images transferred to papers on the
papers.
Fixing heater
Pressure roller
2 Technical Overview > Image Formation System > Overview/Configuration > Drum Cleaning Block
drum
Media
Transfer roller
F-2-23
Fixing film
Toner
Media
F-2-24

■ Drum Cleaning Block

The drum cleaning block removes the toner remained on the photosensitive drum.
Step 7: Drum cleaning
In this step, toner remained on the photosensitive drum is removed.
The cleaning blade scrapes the leftover toner on the surface of the photosensitive drum; the
toner is collected into the cleaner container.
By implementing the above step, the surface of the photosensitive drum is cleaned.
Cleaning blade
Cleaner container
2-18
Photosensitive
drum
F-2-25
2-18