Controlling Blank Exposure; Outline - Canon NP6218 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
G. Controlling Blank Exposure

1. Outline

The copier uses the reflecting plate to direct the light of the pre-exposure lamp to the
photosensitive drum by way of executing blank exposure, thereby blanking (whiting) out
the non-image areas and areas between copies.
The area of blank exposure is controlled by the two slide shutters and one open/close
shutter.
Lens motor
Gear A
Gear B
Blank shutter
solenoid
(SL3)
4-18
M
Slide shutter (rear)
Pre-exposure lamp
Open/close shutter
Figure 4-115
COPYRIGHT © 1997 CANON INC.
Change solenoid (SL1)
Reflectiong plate
for size blanking
Blanking shutter home
position sensor (PS3)
DC controller PCB
CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Reflectiong plate
for full blanking
Slide shutter
(front)