HP LaserJet Enterprise M552 - Step 1: Pre-exposure; Step 2: 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 1-14 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 1-15 Primary charging
Photosensitive drum
Primary charging roller
Primary charging bias
ENWW Engine laser/scanner system 35