Canon imagePRESS C1 P, Service Manual, Page: 377 / 1265

Chapter 7
7-28
F-7-29
ARCDAT Correction Calculation Flow Chart
F-7-30
7.4.13 D-half Control
0020-4151
imagePRESS C1+ (Printer) / imagePRESS C1+
This control regulates gradation correction in the main controller of the printer in order to achieve optimum gradation characteristics.
Start-Up Timing
- While performing the PASCAL control
- During last rotation after 500 printing jobs (When the 4-color prints)
- During last rotation after 400 printing jobs (When the 5-color prints)
- During initial multiple rotation at power-on (The fixing temperature must be 50 deg C or lower.)
Description
Main controller outputs the patch data of each color (L, Y, M, C, Bk) at the DC controller when given conditions are met. DC controller produces patch patterns of
each color (L, Y, M, C, Bk) on the drum based on this data.
Subsequently DC controller measures patch patterns with the patch image scan sensor (PS3, PS4, PS76) and sends the results back to the main controller. Based on
the obtained measurements, main controller then regulates the gradation correction in order to achieve optimal halftone image/
This control also produces a standard patch used in the ARCDAT control and stores a set of standard data for the AR CDAT collected from PS3, PS4, PS76.
Front Center Rear
PDL Character
(10 patches) PDL Image
(10 patches) Copy Image
(10 patches)
Copy Character
(10 patches)
For each color
For each color
PLD Character(1 patches)
PLD Image (1 patches)
Copy Image (1 patches)
ARCDAT Standard Pattern
Density Data (A) Output
PS4, PS76
Main Controller
DC Controller
ARCDAT Standard Patch
Pattern Formation
Patch Scan
Start-Up
Saving as ARCDAT
Standard Data
Data Output (DC-CON)
Density Data (DC-CON)
100
25
100
10
25
10
A
DC Controller