Canon iR2200 Series, Service Manual

Page: 108 / 768

COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001
CHAPTER 2 ORIGINAL EXPOSURE SYSTEM
2-12 R
F02-404-01
Point of original detection
Copyboard glass
Xenon lamp
Original sensor
Reader unit
Copyboard cover
Point of original detection 1
Point of original detection 2
Point of original detection 3
Point of original detection 4
(external light)
Original (A4R)
(external light)
4.4 Outline of Detection Operation
4.4.1 Book Mode, 1 Original, Copyboard Cover Open
[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 (T02-404-01)