Original Size Detection - Canon Color Image Reader - L1 Service Manual

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Technology
Following shows the scanning speed in each mode.
Function Mode Scan speed
B&W 468 mm/sec
Copy / SEND
Full color 203 mm/sec
Error Code
E202 (error in the scanner home position)
-0001 Error during home position detection operation (outward) of the front scanner unit.
-0002 Error during home position detection operation (homeward) of the front scanner unit.
Service Mode
(Lv.1) COPIER > ADJUST > ADJ-XY> ADJ-X
(Scanner system image leading edge position adjustment)
Enter the value to adjust the position of image leading edge.
Setting range: 1 – 100 (changing the value by 10 moves the position by 1mm)
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Technology

Original size detection

Original size is identifi ed based on the result combinations of refl ection light at the specifi c
point on the refl ection sensor and the scanner unit. To prevent the original from moving when
closing the DADF, there is 2 point original size detection per each size on the scanner unit.
•
In main scanning direction: scanner unit (AB type: 9 point measurement, Inch type: 6 point
measurement)
•
In sub scanning direction: refl ection type photo sensor (AB type: 1 point, Inch type: 1 point)
Original size is detected in the following procedure.
1) External light search (in main scanning direction only)
While keeping the LED lamp unit OFF, the CMOS sensor level of each detection point is
measured in main scanning direction.
2) Output level detection of each sensor
While keeping the LED lamp unit ON, CMOS sensor level of each detection point is
measured in main scanning direction.
The machine turns ON the LED of refl ection type photo sensor in sub scanning direction and
measures the sensor output.
Original size is identifi ed by these output combination.
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