COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 1 GENERAL DESCRIPTION1-26Although the light area on the surface of the photosensitive drum is expressed as hav-ing positive potential, it in practice is charged to a negative potential. (When the poten-tial of the cylinder is used as the reference, the potential of the photosensitive drum ishigher than that of the cylinder.)Caution:Figure 1-807