Canon iR8500 Service Manual page 111

CHAPTER 2 NEW FUNCTIONS
25˚
AB-Configuration
Point of CCD detection
Originals
1
size
A3
B4
A4R
A4
B5
B5R
None
2-56
F02-308-03
Original
2 3 4
sensor
T02-308-02
COPYRIGHT © 2001 CANON INC.
[4] The copyboard cover is closed.
When the copyboard cover is brought
down to 25°, the Copyboard cover sensor
detects the "closed" state, and original size
detection starts.
For main scanning direction, the xenon
lamp is turned on, and the CCD checks for
reflected light (4 points).
For sub scanning direction, the original
sensor starts detection.
[5] The copyboard cover is fully closed.
The changes in the output level of each
sensor are monitored until the copyboard
cover is fully closed. The absence of a
change is identified as indicating the ab-
sence of paper, and the size of the original
is identified based on the combination of
changes in level at five points (T02-308-
02).
[6] The scanner remains in wait (for a press on
the Start key).
The No. 1 mirror base moves to home posi-
tion, and the scanner waits for a press on
the Start key (wait state).
Inch-Configuration
Originals Point of CCD detection
1
size
11"×17"
LGL
LTRR
LTR
None
: Changes
2000 2000 2000 2000
Original
2
sensor
: Does not changes
CANON iR8500/7200 REV.1 AUG. 2001