Canon iR5570 Series, Service Manual

Page: 148 / 684

Chapter 5
5-10
F-5-16
1. Checking the Presence/Absence of an Original at 2 Points (individual points of detection)
For main scanning direction, the machine identifies the presence/absence of an original with reference to the CCD output at 2 points (nearest).
F-5-17
T-5-7
Note:
Change in the Signal in Response to ADF Open -> Closed
change present: no
other: yes
The OR argument is applied to the outputs at 2 points.
2. Priority on the Presence of an Original at the Front
If the machine detects the absence of an original at the rear in spite of detection of the presence at the front for main scanning direction, the machine will
identify the size of the original upholding the result of detection at the front.
Result of
movement
Result of identification
A B
no no original absent
yes no original present
no yes original present
yes yes original present
Point of original
detection 3
Point of original
detection 4
Point of original
detection 1
Print of original
detection 2
B5
B6
A5
A4
B5R
A4R
B4
A3
CCD original detection position
Point of original
detection 2
Point of original
detection 1
Point of original
detection 3
LTRR
STMT
LTR
LGL
279.4×431.8mm
(11"×17")
CCD original detection position
Original
sensor 3
AB-Configuration Inch-configuration
STMTR
Original
sensor 1
Near 4-mm point
Near 13-mm point
1A = additional
detection point 1
Original size
border line
Original size
border line
1B = additional
detection point 2