Arcdat Control - Canon imagePRESS C1 P Service Manual

Chapter 7
PDL Character
(10 patches)
ARCDAT Correction Calculation Flow Chart

7.4.14 ARCDAT Control

imagePRESS C1 P / imagePRESS C1
ARCDAT control regulates the gradation correction in the main controller in order to achieve desired gradation characteristics.
Start-up Conditions
- Performed sheet-to-sheet
Description
Main controller outputs the patch data of each color (Y, M, C, Bk) at the DC controller sheet-to-sheet. DC controller produces patch patterns of each color (Y, M,
C, Bk) on the drum based on this data. (The total of 4 patterns, 1 pattern for each color.)
Subsequently DC controller measures patch patterns with the patch image scan sensor (PS4, PS76) and sends the results back to the main controller. Main controller
then measures the obtained data up against the backup of ARCDAT standard data. Main controller reflects the differences found between the two data as the offset
value in D-Half results and then in the next page.
7-30
Front Center
PDL Image
(10 patches)
ARCDAT Standard Pattern
PLD Character(1 patches)
PLD Image (1 patches)
Copy Image (1 patches)
100
A
25
10
10 25
Data Output (DC-CON)
Rear
Copy Image
(10 patches)
Copy Character
(10 patches)
For each color
F-7-33
Start-Up
ARCDAT Standard Patch
Pattern Formation
Patch Scan
Density Data (A) Output
100
Saving as ARCDAT
Standard Data
F-7-34
For each color
DC Controller
PS4, PS76
DC Controller
Main Controller
0013-4818