2
2
2-61
2-61
Process/Operation > Image Formation System > Controls > Image Stabilization Control
Process/Operation > Image Formation System > Controls > Image Stabilization Control
● D-half Control
Optimal image gradation is determined.
Control timing
1) When replacing the Drum Unit
2) At last rotation on a specified print basis
3) When executing PASCAL control
4) At recovery from sleep mode
Control description
1) Main Controller PCB 2 outputs patch data in each color (Y, M, C, and Bk) to the DC
Controller PCB.
2) From the data above, the DC Controller PCB forms patch pattern in each color (Y, M, C,
and Bk) on the ITB.
3) The DC Controller measures the patch pattern by the Patch Sensor Front (UN44) and
the Patch Sensor Rear (UN43) and the result is returned to the Main Controller PCB 2.
4) Based on the data above, the Main Controller PCB 2 executes gradation correction to
obtain ideal halftone image.
Note that the reference patch used for ARCDAT control is formed with this control and
the measurement result of the Patch Sensors or the reference data for ARCDAT is
stored. (See NOTE)
NOTE:
The following 4 types of patch patterns are formed with this control:
• A pattern for copy (9 patches for each color)
• A pattern for text priority (9 patches in each color)
• A pattern for photo priority (8 patches in each color)
• A reference pattern for ARCDAT control (3 patches in each color)
ITB
Patch Sensor
Rear(UN43)
Patch Sensor
Front (UN44)
Patch image data
Density data
Video data
Laser output
DC Controller PCB(UN9)
Laser Scanner Unit
Main Conttoller PCB 2
D-half control
F-2-88
