Canon imageRUNNER ADVANCE C5051 Series Service Manual page 86

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Technology■>■Image■Formation■System■>■Controls■>■Developing/drum
● ACR■(Auto■Carrier■Refresh)■control ■
This■machine■introduced■a■method■to■supply■developer■(toner■+■carrier)■to■improve■life■(longer■
life)■of■the■developing■assembly.■
This■is■a■control■to■supply■developer■to■the■developing■assembly■and■also■discharge■
developer■to■keep■optimal■developer■amount■in■the■developing■assembly.
This■control■prevents■deterioration■of■carrier,■which■had■been■occurred■due■to■reuse■of■
developer■in■the■developing■assembly.
The■Toner■Feed■Screw■A■&■B■drive■when■the■Developing■Motor■(M5■to■8)■drives■so■that■the■
developer■will■be■exhausted.■The■developer■is■supplied■at■the■right■time■based■on■the■ATR■
control■result.
Toner feeding screw A
Flow of toner
Toner supply inlet Toner feeding screw B
Toner supply inlet
Toner feeding screw B
2 Technology■>■Image■Formation■System■>■Controls■>■Developing/drum
Return screw
Toner discharge outlet
ATR sensor Toner feeding screw C
Toner feeding screw A
Return screw
Toner feeding screw C
Toner discharge outlet
● Toner-blocking■bias■control ■
This■control■prevents■scattering■of■toner■on■the■developing■cylinder■due■to■deterioration■of■the■
developing■assembly.
Developing■AC■bias■which■has■been■generated■by■HVT1■(UN16)■is■generated■to■be■negative■
DC■bias■on■the■developing■sub■high■voltage■PCB■(UN43■to■46).
The■generated■bias■is■applied■to■the■toner-blocking■electrode■plate.■This■improves■retention■
strength■of■toner■on■the■developing■cylinder.
Developing sub high voltage PCB Y/M/C/Bk (UN43 46)
Developing
cylinder
F-2-73
Toner feeding screw B
DC controller(UN1)
HVT1/2 (UN16/17)
DC
Toner-blocking
electrode plate
Toner feeding screw A
2-50
F-2-74
2-50