CHAPTER 2 OPERATION OVERVIEW
3. Document size detection
Regular size document sizes are detected through a combination of ON and OFF
states of the paper detection sensors (PS851, PS852) and document length sensors
(PS802, PS803).
Sensor ON and OFF states are transferred to the unit image processor PCB, which
identifies the document sizes.
a. Paper detection
The light shields interlocked with the slide guides obstruct (sensor ON) or do not
obstruct (sensor OFF) the two paper detection sensors (PS851, PS852) on the paper
width sensor PCB and it is a combination of these two states that allow the unit to detect
document width.
Slide guideSlide guide
PS852
PS851
Document width sensor PCB
Figure 2-203
COPYRIGHT ? 1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)2-5 |