Enlargement/Reduction - Canon imageRUNNER 2270 Service Manual

Chapter 5
<Service Mode>
for CIS unit gain correction data
COPIER>OPTION>BODY>CCD-LUT
for CCD gain correction
COPIER>FUNCTION>CCD>LUT-ADJ2
(using the D-10 Chart)

5.3.3 Enlargement/Reduction

5.3.3.1 Changing the Magnification in Main Scanning Direction
In Book Mode/ADF Mode
The image is read at 100% in main scanning direction, and the magnification is varied by
processing the data on the main controller PCB.
5.3.3.2 Varying the Magnification in Sub Scanning Direction
To vary the magnification in sub scanning direction, the machine operates as follows
depending on the selected method of reading the original and the selected rate of
magnification:
1. In Book Mode
To suit the selected rate of magnification, the speed at which the original is read is varied
and the data is processed by the reader controller PCB/main controller PCB.
EX: for reduction to 25%, the original is read at 236 mm/sec and the data is varied for 50%
reduction by the reader controller PCB (skipping data for 1/2) and for 50% reduction
by the main controller PCB (skipping data for 1/2).
EX: at 100%, the original is read at a speed of 236 mm/sec.
Operation
Varying the speed of reading the
original (mm/sec)
5-16
T-5-5
Magnification
25% to 49% 50% to 99%
236 to 120 236 to 119
0006-5724
0006-5725
100% to 400%
236 to 59