Canon NP6012 Service Manual page 44

li. AUXILIARY PROCESS
1. Side Blank Exposure
Side blank exposure is used to prevent
adhesion of excess toner to the drum by
removing the residual potential in the non-
image areas (front, rear) of the drum. See p.
3-35 for details.
2. Nip Exposure
In nip exposure, part of the light from the
pre-exposure lamp is directed to the area
where the photosensitive drum is in contact
with the primary charging roller, thereby
ensuring the stability of primary charging.
Pre-exposure
lam
Primary charging roller
Photosensitive
drum
Reflecting ————~
plate
Cleaning
blade
——— : path of light (nip exposure)
ao : path of light (pre-exposure)
Figure 2-115