Canon iR8500 Service Manual page 109

CHAPTER 2 NEW FUNCTIONS
a. Book Mode, 1 Original, Copyboard Cover Open
Xenon lamp
Copyboard cover
Reader unit
(external light)
(external light)
F02-308-02
2-54
Original sensor
Point of original detection 1
Point of original detection 2
Point of original detection 3
Point of original detection 4
Copyboard glass
Point of original detection
Original (A4R)
COPYRIGHT © 2001 CANON INC.
[1] The scanner remains in wait.
No. 1 mirror base: at HP
Xenon lamp: off
Original sensor: disabled
[2] The copyboard is opened.
Detection starts of external light in main
scanning direction.
No. 1 mirror base: to point of original de-
tection
Xenon lamp: off
Original sensor: disabled
[3] An original is placed.
The width of the original is identified in
relation to the presence/absence of external
light; here, the absence of an original is
identified at points in question, eliminating
B5, B4, A4, and A3.
[4] The Start key is pressed.
In response, original detection is started.
For main scanning direction, the xenon
lamp is turned on to check for reflected
light by the CCD (4 points).
For sub scanning direction, the original
sensor starts detection.
The absence of external light is identified
as indicating the absence of an original.
The machine will identify the size of an
original based on the combination of the
results (T02-308-01)
2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001