Canon imagePRESS C1 Service Manual - page 380
Chapter 7
7-31
F-7-35
[1] Patch image data
[2] Density data
[3] ARCDAT control
[4] Video data
PS4: patch image sensor (for Y and Bk)
PS76: patch image sensor (for M and C)
Operation Flow Chart
Below is operation flow chart of ARCDAT control.
F-7-36
Memo:
This is an example of 2 full-color printing jobs on A4 document.
Patch patterns of Y and M are measured while printing the first document, and the results will be reflected in the second printed document. As for patch patterns of
PS76
PS4
DC-CON
[1]
[3]
Laser Scanner
unit
[4]
MN-CON
[2]
Comparison of Obtained Data (A')
and Standard Data (A)
Main Controller
Data Input (MN-CON)
Data Output (MN-CON)
100
10
25
25
Current Gradation
Characteristics
60
Gradation Characteristics
after Gradation Correction
PS4, PS76
Sending the Obtained Data (A')
Patch Scan
Start-Up
DC Controller
Patch Pattern Formation
DC Controller
Data Output (MN-CON)
Density Data (DC-CON
25
10
25
A
A'
Determining the Offset Value (a)
by Taking the Difference Between
A and A'
Main Controller
Main Controller
Reflecting in D-Half
Correction Table