Canon IMAGERUNNER ADVANCE C5030, Руководство по обслуживанию, Страница: 82 / 1455

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Technology■>■Image■Formation■System■>■Controls■>■Pre-exposure
Technology■>■Image■Formation■System■>■Controls■>■Pre-exposure
Controls
■ ■ Overview
Pre-exposure
■■■■■■ Pre-exposure■control
Primary■charging
■■■■■■ Primary■charging■bias■control
Discharge■current■control
Primary■charging■cleaning■control
Developing/drum
■■■■■■ Developing■bias■control
ACR■(Auto■Carrier■Refresh)■control
Toner-blocking■bias■control
Drum■(presence)■detection
New/old■detection■of■drum■unit
Drum■life■detection
Drum■heater■control
Drum■Drum■rotation■speed■control
Transfer/separation
■■■■■■ Primary■transfer■disengagement■control
Primary■transfer■bias■control
Secondary■transfer■bias■control
ITB■displacement■correction■control
ITB■cleaning■control
Secondary■transfer■outer■roller■cleaning■
control
Drum■cleaning
■■■■■■ Drum■cleaning■control
Image■stabilization■control
■■■■■■ Drum■film■thickness■detection
D-max■control
D-half■control
ARCDAT■control
PASCAL■control
Color■displacement■correction■control
ATVC■control
Toner■supply
■■■■■■ Toner■cap■automatic■opening■control
Toner■level■detection/toner■supply■control
Waste■toner■feeding
■■■■■■ Waste■toner■full■level■detection
Waste■toner■case■(presence)■detection
T-2-29
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Pre-exposure
■ ● Pre-exposure■control
Removing■residual■potential■on■the■photosensitive■drum■before■executing■the■primary■
charging■prevents■drum■ghost■during■continuous■print.
According■to■the■command■from■the■DC■controller■PCB,■the■pre-exposure■unit■exposes■(emits)■
LED■when■the■photosensitive■drum■is■rotated.
Emitting■LED■light■through■the■light■guide■removes■residual■potential■on■the■photosensitive■
drum.
To■make■up■for■the■lack■of■LED’s■light■intensity,■two■(2)■pre-exposure■LEDs■are■used■in■total:■
one■at■the■front■of■the■main■unit,■and■the■other■at■the■rear■of■the■main■unit.
DC controller
(UN1)
Photosensitive drum
Light guide
Primary charging roller
Charging roller cleaning brush
Pre-exposure LED (front)
Pre-exposure LED (rear)
(UN24 / 26 /28 / 30)
(UN23 / 25 /27 / 29)
F-2-66