User Guide

CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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VII.BLANKING
A. Outline
The area of the drum between the tailing edge of one copy and the leading edge of the next
would normally act as an all-black area and attract toner if a preventive measure were not taken.
This measure is to switch the primary corona OFF and the primary corona assembly grid bias ON.
When the copy (cassette) size is a non-default size or when the copier is in the REDUCE mode,
the light from the pre-exposure lamp is directed to the photosensitive drum by way of the reflecting
plate to prevent adhesion of toner; the blank exposure shutter is moved to open the exposure slit
making use of the movement of the lens.