Controlling The Side Blanking Mechanism - Canon PC920 Service Manual

G.

Controlling the Side Blanking Mechanism

1. Outline
The machine is equipped with a side blanking lamp at the front and the rear used to prevent
adhesion of excess toner when making reduced copies.
2. Operations
To blank out the non-image area in reduce mode, the side blanking lamp is moved in relation to
the distance over which the lens moves as detected by the lens shift detecting shaft.
Reflecting
plate
A


 
 
COPYRIGHT © 1999 CANON INC.
Rear side
blanking lamp
Lens shift detecting shaft
Figure 4-121
B
Photosensitive drum
Non-image area in Reduce mode
A: Position of the side blanking lamp in Direct and Reduce mode
B: Position of the side blanking lamp in Reduce mode
Figure 4-122
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE FORMATION SYSTEM
Front side
blanking lamp
(front)
B
Reflecting
plate
A
4-21