Dirt Sensor Control; Dust Detection In Stream Reading Mode <Ir7105/7095 - Canon imageRUNNER 7095 Service Manual

5. In a Wait State (for a press on the Start key)
No.1 mirror base: at point of original detection
scanning lamp: off
original sensor: off
AB-Configuration
Original
size
A3
B4
A4R
A4
B5
B5R
A5
B6
none

5.3.5 Dirt Sensor Control

5.3.5.1 Dust Detection in Stream Reading Mode <iR7105/7095>
In addition to the common points for stream reading, the machine uses an additional 6 points each for
small-size and large-size sheets at intervals of 0.5 mm to avoid areas of dust (in total, 7 points for small-
size and 7 points for large-size).
If it detects dust, however, it changes the point of reading to prevent dust from appearing in images. The
detection of dust is executed at the end of each single job that uses stream reading; the machine moves the
ADF belt idly when stream reading is selected and identifies any black line as an area of dust.
When it detects dust, it resets the current point of stream reading, and uses the point of reference on the
leftmost edge for dust detection; if dust is detected, it moves the point of stream reading to the right by 1
point (0.5 mm) for detection of dust for a second time. If dust is not detected, the machine uses that point
as the point for stream reading. If dust is detected once again, it will use the next point. If dust is detected
at all 7 points, the machine will indicate the message "Copyboard Glass Soiled," which will remain unit
the ADF is opened and the copyboard glass is cleaned. The machine will not use stream reading but use
fixed reading as long as the message remains.
CCD point
of detection
1 2 3 4
A B A B A B A B
Dust
Black line on
output
F-5-36
Inch-configuration
Original of detection
Original
1
size
sensor 1 A B
11"x17"
LGL
LTRR
LTR
STMTR
STMT
absent
change absent
F-5-37
3 mm (7 points)
F-5-38
CCD point
Original
2 3
sensor 3
A B A B
:change present
Chapter 5
0010-8001
5-17