Auxiliary Process; Blank Exposure - Canon NP6330 Service Manual

VII.

AUXILIARY PROCESS

A. Blank Exposure
Blank exposure is used to eliminate the drum surface potential in the non-image
area occurring as a result of the difference, if any, between original and copy or in
Reduce mode.
The light from the pre-exposure lamp is reflected by the replacing plate so that it is
directed to the photosensitive drum after image exposure.
The non-image area between sheets of copy paper is exposed by light from the pre-
exposure lamp which is reflected by a separate reflecting plate.
COPYRIGHT © 1997 CANON INC.
Pre-exposure

Blank exposure

lamp
lamp optical path
Shutter
Reflecting plate
Sheet-to-sheet
blank exposure
optical path
Pre-exposure
optical path
Figure 1-615
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
Reflecting plates
No. 6 mirror
Image exposure
optical path
Photosensitive
drum
1-29