Canon IMAGERUNNER ADVANCE C5030, Service Manual, Page: 102 / 1455

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Technology■>■Image■Formation■System■>■Controls■>■Image■stabilization■control
Technology■>■Image■Formation■System■>■Controls■>■Image■stabilization■control
■ ● 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.
4)■The■Main■Controller■2■executes■the■gradation■correction■to■realize■the■ideal■halftone■image■
based■on■this■data.
Also,■this■control■creates■the■standard■patch■used■at■ARCDAT■control■and■stores■the■
standard■data■for■ARCDAT■according■to■the■measurement■result■of■UN49.■(refer■to■MEMO.)
ITB
Density data
Video data
DC controller(UN1)
Laser scanner unit 1/2
Main controller2
D-half Control
Patch sensor
(center)
(UN49)
Patch image date
Laser Power output
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