Transfer block
The third part of the image formation process is the transfer block, in which the toner image
is transferred from the photosensitive drum to the paper. This block consists of three steps:
● attaching
● transfer
● separation
Step 6: Attaching
After the paper is picked up from the input tray, the attaching roller pushes it against the
ETB. The attaching roller has a positive DC bias, and it creates a positive charge on the
paper.
Figure 5-23. Attaching the paper to the ETB illustrates this step.
Figure 5-23.
Attaching the paper to the ETB
Step 7: Transfer
A positive bias is applied to the transfer charging roller, which is directly opposite the
photosensitive drum. As the ETB passes the transfer charging roller, it picks up a positive
charge. The negatively charged toner on the photosensitive drum is transferred to the
positively charged paper.
Figure 5-24. Toner transfer illustrates this step. This process is
repeated for each color as the ETB carries the paper from the bottom cartridge to the top (C,
Y, M, K).
158 Chapter 5 Theory of operation ENWW
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