HP LaserJet Enterprise 500 color MFP M575 Series - Page 52

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 1-11 Pre-exposure
Step 2: Primary charging
The primary-charging roller contacts the photosensitive drum and charges the drum with negative
potential.
Figure 1-12 Primary charging
24 Chapter 1 Theory of operation ENWW