Canon imagePRESS C1 P Service Manual page 378

(See Note.)
[1] Patch image data
[2] Density data
[3] D-half control
[4] Video data
PS3, PS4, PS76: patch image sensor
Operation Flow Chart
Below is operation flow chart of D-half control.
Example: D-Half Correction Table for Yellow
Observed gradation
characteristics
100
Y6
Y5
Y4
Y3
Y2
Y1
0
Data Output (MN-CON)
Memo:
The patch patterns produced in D-half control are as follows.
[4]
Patch Pattern Data Output
Patch Patten Formation
Y10
Y9
Y8
Y7
Optimum gradation
characteristics
100
D-Half Correction Table Update
Laser Scanner
unit
PS76 PS3 PS4
DC-CON
[2]
[3]
MN-CON
F-7-31
Start-Up
Main Controller
DC Controller
PS3, PS4, PS76
Patch Scan
DC Controller
Density Data Output
Main Controller
(L,Y, M, C, Bk))
F-7-32
[1]
100
Optimum gradation
characteristics
D-Half Correction Table
0
Data Output (MN-CON)
Chapter 7
100
7-29