negative DC supply. The negatively charged toner is attracted to the discharged (exposed, grounded)
areas of the drum, and is repelled from the negatively charged (unexposed) areas.
Figure 1-13 3. Developing
Developer blade
Photosensitive drum
Developing roller
Developing bias
4. Transfer
During the transfer process, the toner image on the drum surface is transferred to the paper. The
transfer charging roller applies a positive charge to the back of the paper and causes the negatively
charged toner on the drum surface to be attracted to the paper. After separation, the drum is cleaned
and conditioned for the next image.
Figure 1-14 4. Transfer
Paper
Transfer roller
Photosensitive
drum
Transfer bias
24 Chapter 1 Theory of operation ENWW
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