HP Enterprise CC490A manual Pre-exposure, Primary charging

Step 1: Pre-exposure

Light from the pre-exposure LED strikes the surface of the photosensitive drum to remove any residual electrical charges from the drum surface.

Figure 1-13 Pre-exposure

LED

Photosensitive drum

Step 2: Primary charging

The primary-charging roller contacts the photosensitive drum and charges the drum with negative potential.

Figure 1-14Primary charging

Primary charging roller

Primary charging bias

Photosensitive drum

24 Chapter 1 Theory of operation ENWW