Pascal Control (Image Gradation) - Canon iR3245 Series Service Manual

Chapter 7

7.4.4 PASCAL Control (image gradation)

iR3225 / iR3225N / iR3235 / iR3235N / iR3245 / iR3245N
Changes in temperature/humidity or wear on the machine can cause changes in gradation characteristics.
The PASCAL control mechanism is used to stabilize gradation characteristics of images on paper.
It makes up for the changes in gradation characteristics in response to changes in temperature/humidity or wear on the machine.
Description of Control
Start-up
V
Prints out the test pattern stored in the main controller.
V
Sets the previously printed-out test print in the reader and reads it by the scanner.
V
Prepares the image correction table A *1(data processing)
V
End
*1 The image correction table A created in PASCAL control is applied only in copy mode.
Timing of Control
Any time: During execution of automatic gradation correction in the user mode
<TEST PATTERN>
7-8
F-7-9
0019-0273