Controlling The Activation In Hole Image Erase Mode; Controlling The Activation In Ae Mode - Canon NP6251 Service Manual

7. Controlling the Activation in Hole Image Erase Mode

In hole image erase mode, images of such holes as punched in the original are
erased by turning on LEDs to prevent adhesion of toner along the width.
The width may be adjusted between 1 and 20 mm.

8. Controlling the Activation in AE Mode

In AE mode, the surface potential of the drum is measured so that the blank
exposure LEDs would have to be turned off.
Since only parts of the photosensitive drum are used to measure the surface
potential, however, those LEDs that are over the area of measurement are turned with
the remaining LEDs kept on.
COPYRIGHT © 1997 CANON INC.
  
Feeding
direction
Figure 4-120
Blank exposure lamp (LEDs)
Photosensitive drum
Figure 4-121
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
1 to 20 mm
Potential sensor
4-21