Canon IMAGERUNNER ADVANCE C5030, Руководство по обслуживанию, Страница: 99 / 1455

2
2
2-63
2-63
Technology■>■Image■Formation■System■>■Controls■>■Image■stabilization■control
Technology■>■Image■Formation■System■>■Controls■>■Image■stabilization■control
■ ● Drum■film■thickness■detection
To■detect■use■condition■of■the■photosensitive■drum
Execution■timing
1)■When■the■power■is■turned■ON.
2)■Every■time■making■print
Control■description
1)■The■drum■count■value■is■calculated■by■the■monitor■signal■of■the■primary■charging■AC■bias.
2)■The■count■value■calculated■in■step■1)■above■is■added■to■the■drum■count■value■that■has■been■
kept■in■SRAM.
3)■The■latest■count■value■determined■in■step■2)■above■is■classified■to■be■one■of■the■10■levels■
as■the■drum■film■thickness■detection■data.
4)■The■determined■data■is■compared■to■the■existing■drum■film■thickness■detection■data■kept■in■
the■other■area■in■SRAM.■If■there■is■any■difference■between■both■data,■the■newly-determined■
data■is■overwritten■on■SRAM■as■the■latest■drum■film■thickness■detection■data.■If■there■is■no■
difference■in■both■data,■the■newly-determined■data■is■not■overwritten,■but■disposed.
HVT1
(UN16)
DC controller
(UN1)
Photosensitive
drum
Drum count
data
Drum film
thickness data
SRAM(IC2)
Y
M
C
Y
M
C
Monitor signal
Primary charging
roller
Y M C Bk
Primary charging
AC bias
drive signal
MEMO:
Bk■Drum■for■highly-durable■type,■the■drum■is■no■shave.
Therefore,■Bk■drum■is■not■the■thickness■detection.
The■result■of■drum■thickness■detection■is■reflected■to■the■following■data.
•■ Developing■bias
•■ Primary■transfer■bias
•■ ATR■patch■detection■result
•■ Laser■output
F-2-93
■ ● D-max■control
This■control■determines■optimal■developing■DC■bias,■primary■charging■DC■bias,■laser■power■
output.
Execution■timing
1)■When■replacing■a■drum■unit■or■developing■assembly.
2)■At■every■post-rotation■after■the■total■reaches■1000■prints.
3)■Power■ON■(High■temperature■and■humidity)and■corrects■the■each■color■developing■DC■
bias,■primary■charging■DC■bias,■laser■power■output■to■realize■the■target■density.
Detection■details
1)■DC■controller■creates■the■patch■pattern■in■corresponding■color■on■the■ITB.
2)■DC■Controller■measures■the■patch■density■with■the■Patch■Sensor■(center)■(UN49)
Patch sensor
(Center)
(UN49)
Developing
cylinder
Primary
charging roller
Primary charging
DC bias
Laser Power output
Photosensitive
drum
Developing DC bias
Patch image date
DC controller(UN1)
D-max control
ITB
HVT2
(UN17)
HVT1(UN16)
Laser scanner
unit 1/2
F-2-94