Photosensitive drum

The special properties of the photosensitive drum allow an image to be formed on the drum surface and then transferred to paper. The drum is an aluminum cylinder. The outside of the cylinder is coated with a layer of organic-photoconductive material (OPC) which is non-toxic. The OPC material has properties similar to a photo-resistor. It becomes electrically conductive when exposed to light, and he negative charges deposited on the drum are conducted to the ground potential of the drum base. Areas not exposed to light remain non-conductive and maintain their negative charge. The aluminum base of the photosensitive drum is electrically connected to ground potential.

Photosensitive

Layer

Aluminum

Base

Figure 16.Photosensitive Drum

Cleaning the drum

In the transfer stage, not all the toner is transferred to the paper, but some remains on the photosensitive drum.

In this stage, the residual toner is cleaned so that the next print image will be clear and distinct.

Figure 17.

Cleaning the drum

 

The residual toner on the drum surface is scraped away with the cleaning blade to clean the

 

drum surface in preparation for the next print. The removed toner is collected into the cleaner

 

container.

84 Functional information

Q1860-90918

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HP 5100LE manual Photosensitive drum, Cleaning the drum