Controlling The Activation In Hole Image Erasing Mode; Controlling The Activation Of Ae Mode - Canon NP6045 Service Manual

7. Controlling the Activation in Hole Image Erasing Mode

Hole image erasing mode is provided to prevent black dots from appearing on copies
made of an original with holes. LEDs are turned ON so that a width covering such holes
will be free of toner.
The width may be varied between 1 and 20 mm.

8. Controlling the Activation of AE Mode

In AE mode, the surface potential of the drum is measured, requiring that LEDs be
turned OFF.
Since only part of the photosensitive drum is measured for surface potential, how-
ever, only the LEDs shining such areas are turned OFF and other LEDs are turned ON.
COPYRIGHT © 1997 CANON INC.
  
F eeding direction
Figure 4-118
Blank exposure lamp (LEDs)
Photosensitive drum
Figure 4-119
CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
1~20mm
Potential sensor
4-19