Canon imageRUNNER ADVANCE C5051 Series Service Manual page 88

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Technology■>■Image■Formation■System■>■Controls■>■Developing/drum
● Detection■of■drum■(presence) ■
To■detect■if■the■drum■unit■is■installed■or■not
Execution■timing
1)■When■the■power■is■turned■ON
2)■At■recovery■from■sleep■mode
Detection■description
To■be■determined■by■current■monitoring■value■of■the■primary■charging■AC■bias
In■case■that■current■monitor■value■is■less■than■the■specified■value■(1mA):■no■Drum■Unit
In■case■that■current■monitor■value■is■the■specified■value■(1mA)■or■more:■Drum■Unit■present
Execution■timing
Within■1■second
Operation■of■the■main■unit
Operation■of■the■main■unit■is■stopped■while■"No■drum■unit"■is■shown■on■the■control■panel.
Y M C Bk
Primary charging roller
2 Technology■>■Image■Formation■System■>■Controls■>■Developing/drum
Primary charging AC
HVT1
Current monitoring signal
(UN16)
Primary charging AC DC controller
(UN1)
HVT2
(UN17)
Current monitoring signal
● Old/new■detection■of■drum■unit ■
To■detect■whether■the■drum■unit■is■new■or■old
Detection■timing
1)■When■the■power■is■turned■ON
2)■At■recovery■from■sleep■mode
Detection■description
To■check■state■of■the■fuse■that■is■attached■to■each■drum■unit
There■is■a■fuse:■new■drum
Fuse■is■blown:■used■drum
Operation■of■the■main■unit
1)■The■main■unit■checks■presence■of■the■fuse■attached■to■each■drum■(the■fuse■detection■signal■
is■monitored)
2)■If■there■is■a■fuse,■the■main■unit■clears■the■drum■film■thickness■detection■data■of■the■
applicable■drum■unit,■which■is■kept■in■SRAM■(IC2).
3)■The■main■unit■cuts■the■fuse■(to■make■the■fuse■cut■signal■"H")
DC controller
(UN1)
SRAM
F-2-77
(IC2)
Drum unit
+24V
Fuse detection signal
Fuse cut signal
Fuse
F-2-78
2-52
2-52