Canon imagePRESS C1 Service Manual - page 379
Chapter 7
7-30
F-7-33
ARCDAT Correction Calculation Flow Chart
F-7-34
7.4.14 ARCDAT Control
0013-4818
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.
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