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Enlargement/reduction; Magnification Change In Vertical Scan Direction; Magnification Change In Horizontal Scan Direction; Detecting The Size Of Originals - Canon iR2030 Series Service Manual

Ir2030/2025/2022/2018 series.
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4.3.3 Enlargement/Reduction

4.3.3.1 Magnification Change in Vertical Scan Direction

In the Book mode or when the ADF is used
In the vertical scan direction, the image is read at 100%. Magnification is changed by processing data on the image processor PCB.

4.3.3.2 Magnification Change in Horizontal Scan Direction

In the horizontal scan direction, magnification is changed as follows depending on the selected magnification rate:
1) When magnification is reduced to 50-99%
a. In the Book mode
Data is processed on the image processor PCB with the original scan speed held at 118 mm/sec.
b. When the ADF is used
The original feed speed is changed within the range of 118 mm/sec to 236 mm/sec depending on the selected magnification rate. Data is not processed on the image
processor PCB.
2) When magnification is increased to 100-200%
The original scan speed (in the Book mode)/original feed speed (when the ADF is used) is changed within the range of 118 mm/sec to 59 mm/sec depending on the
selected magnification rate. Data is not processed on the image processor PCB.

4.3.4 Detecting the Size of Originals

4.3.4.1 Outline

The original size is identified by the combination of presence and absence of output levels of the reflection type sensors as summarized in the tables below.
- Absence of paper: The light reflected from the reflection type sensor changes when the copyboard cover is open/close.
- Presence of paper: The light reflected from the reflection type sensor does not change when the copyboard cover is open/close.
This machine is provided with the following sensors. Locations of the sensors are shown below.
- Vertical scan direction: Reflection type photo sensors (2 locations for AB; 1 location for Inch)
- Horizontal scan direction: Reflection type photo sensors (2 locations for AB; 2 locations for Inch)

4.3.4.2 Outline of Original Size Detection

- In the BOOK mode
One sheet of original (A4R) is set and the copyboard cover (or ADF ) is closed.
AB-Configration
Horizontal scan direction
Upper left corner
of original
Original sensor 1
Original sensor 2
Inch-Configration
Horizontal scan direction
Upper left corner
of original
Original sensor 1
Index plate
Original sensor 3
Original sensor 4
B5R
A4R
B5
B4
A4
Original sensor 3
Original sensor 5
STMT-R
LTR-R
LGL
LTR
11" 17"
F-4-15
A3
Chapter 4
0017-2631
0017-2632
0017-2633
0017-2634
4-9

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