Canon IMAGERUNNER ADVANCE C5045, Руководство по обслуживанию

Страница: 68 / 1131

2
2
2-44
2-44
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-2-25 T-2-25
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-2-70 F-2-70