Dirt Sensor Control; Outline - Canon iR3570 Service Manual

25
Original (A4R)
Original sensor 1
Original sensor 2
Original sensor 3/4 Original sensor 1/2
F-5-18
4. Copyboard cover is closed (with cover angle at 5 deg or more but less than 25 deg).
Original sensor: on (original size identification 2)
Original (A4R)
5
Original sensor 1
Original sensor 2
Original sensor 3/4 Original sensor 1/2
F-5-19
5. The copyboard cover is closed (5 deg or less).
size identified
original sensor: off
In identifying the size of an original, the data from original size identification processing 1 and data from original size identification processing 2 are compared,
and the difference between these 2 sets of data is checked.
If any of the following is true, the output of the sensors may not show any change, preventing the machine from correctly identifying the size:
-the original is an A3 black original
-the original is a book (its thickness may not allow the copyboard cover to close fully, thus preventing the detection of a change in the sensor level).
-the copyboard cover is not closed fully (when a time-out condition occurs, there will be no detection of a change in the sensor level).
Original sensor 3
Original (A4R)
Original sensor 1
Original sensor 2
Change absent
Change present
F-5-20
The machine uses the following in reference to changes occurring in the sensor output as found in original size identification processing 1 and original size identi-
fication processing 2:
AB-Configuration
Original Original Original
Original
sensor 1 sensor 3
size sensor 2
A3
A4
B4
B5
A4R
B5R
No original
F-5-21

5.3.5 Dirt Sensor Control

5.3.5.1 Outline

iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N / / iR4570N / iR2230 / / / iR3530 /
The machine changes the original read point depending on the presence/absence of dust on the stream reading glass or the platen roller of the ADF, or it may execute
image correction to prevent the dust from showing up in the output. These operations are carried out only when the ADF is in use and, in addition, is closed:
<Timing of Control>
-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)
1st job after power-on
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)
Original sensor 3
Original sensor 4
Original sensor 3
Original sensor 4
Original sensor 4
Inch-Configuration
Original
Original
sensor 4 size
11"X17"
LTR
LGL
LTR-R
No original
Original Original Original
sensor 1 sensor 3 sensor 5
:No original
:change absent
Chapter 5
0006-5929
5-11