C7085-90921 Chapter 5 Theory of operation 105
Primary charge
The primary charge roller applies a negative DC bias to the drum. To maintain a consistent charge
across the drum’s surface, an AC bias is also applied. The charge voltage on the drum surface
ranges from approximately -700 V to -500 V. With the large negative charge on the drum surface, an
equal positive charge forms below the photoconductive material.
Figure 5-3 Primary charge
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