D-Half Control - Canon imageRUNNER ADVANCE C5045 Series Service Manual

2
Output of patch pattern data
Patch pattern is created
Patch patterns (4 types)
are printed on paper
Printed test patterns
are scanned by the reader
(Y)PASCAL correction table
Actual gradation
characteristics
Y63 Y64
100
Output of density data
Ideal gradation
Y2 characteristics
PASCAL correction table is
Y1
0
100
Data output（M-CON）
100
Ideal gradation
characteristics
Actual gradation
characteristics
0 100
Data output（M-CON）
2
Start
Main controller2
DC controller(UN1)
Patch sensor(Center)(UN49)
Patch scanning
DC controller(UN1)
Main controller2
created(Y,M,C,Bk)
F-2-102 F-2-102

D-half control

This control determines optimal image gradation
Execution timing
1) When replacing a drum unit or developing assembly
2) At post-rotation every time the total reaches 1000 prints
3) At execution of PASCAL control
Control details
1) The Main Controller 2 outputs the patch data of each color (Y, M, C, Bk) to the DC
Controller.
2) DC Controller creates the patch pattern of each color (Y, M, C, Bk) on the ITB based on this
data.
3) DC Controller measures the patch pattern with the Patch Sensor (center) (UN49) and
returns the result to the Main Controller 2.
2-63
2-63