Canon Color Image Reader-F1 Service Manual page 16

2
Technology > Controls (Reader) > Controls > IDirt Sensor Control
● Control Details
In horizontal scanning direction, sensor level of each original detection position is measured
by moving the Scanner Unit to the detection position shown in the figure in relation to the
original set position.
AB type
Original detection
position 1
Original detection
position 2
Original detection
A5
position 3
Original detection
B5
position 4
K16
Original detection position 5
Original detection position 6
CCD original detection position
Inch type
Original detection
STMTR
position 1
Original detection
position 2
STMT
Original detection
position 3 LTR
CCD original detection position
2 Technology > Controls (Reader) > Controls > IDirt Sensor Control
Original sensor 1
A5R
B5R
A4R
B4
K8
A3
A4
Original sensor 2
LTRR LGL
279.4×431.8mm
(11"×17")
F-2-3
■ IDirt Sensor Control
● Overview
When reading an original, original reading position is changed according to the presence/
absence of dust on the Stream Reading Glass or the Guide Plate of the ADF (on the Platen
Roller in case of the reverse model), or image correction is performed to prevent the dust to
be printed on an image.
[Control timing]
• At the end of a job
• Between sheets (for each reading of a sheet)
• At the start of a job (only when any of the following conditions is true.)
Dust detected at all points of detection at the end of the previous job
Dust detection failed to end normally at the end of the previous job (e.g., ADF opened)
Main power
Start key
switch ON
ON
WMUP STBY
Dust detection
control
2-5
1st 2nd
SCAN SCAN
Dust detection
Dust detection
control
control
F-2-4
2-5