Exposure - Canon imageRUNNER ADVANCE 6075 Series Service Manual

2
Technology > Image Formation System > Controls > Exposure
Control name
Toner supply
Toner level detection To detect toner level in the Developing Unit and the Buffer Unit.
Toner supply control To supply toner from the Toner Container to the Developing
Assembly.
Toner container detection To detect whether the Toner Container is attached to the host
machine.
Waste toner feeding
Waste toner full level To detect whether the Waste Toner Container is full.
detection
Waste toner screw lock To detect whether the Waste Toner Screw is locked.
detection
Waste toner container To detect whether the Waste Toner Container is attached to the
detection host machine.
Image stabilization control
Potential control To determine primary current (VD), laser power (VL) and
developing bias (Vdc) according to the deterioration level of the
Photosensitive Drum and the environmental change.
PASCAL control To determine gradation adjustment value based on the image
density scanned by the Reader.
2D shading control To correct uneven potential on the Photosensitive Drum by laser

exposure.

Other Control
Startup Contrast Potential To adjust the contrast potential (Vcont) at startup in order to
maintain the density consistently.
Laser APC control To correct the laser output control value to prevent changes in
surface potential by the laser output.
Blank Band Control To blow off the reversely-charged toner on the Developing Sleeve
forcibly to the Drum surface in order to collect the toner into the
Drum Cleaning Unit.
Black Band Control To supply toner thoroughly to the ends of the Cleaning Blade and
prevent the blade from everting by forming the toner band at the
Drum ends.
Low Duty Discharge To forcibly eject toner by forming the toner band at the Drum ends
Control in order to avoid toner deterioration in case low duty images are
continuously output.
2 Technology > Image Formation System > Controls > Exposure
Description
T-2-32
■ Exposure
● Pre-exposure Control
To prevent uneven density with the print image, residual potential on the Photosensitive Drum
is removed before the primary charging.
With the command by the DC Controller PCB, the Pre-exposure LED (LED 1) is emitted. By
emitting the LED on the Photosensitive Drum, remove residual potential on the drum.
Pre-exposure LED(LE1)
2-53
Main Driver PCB(PCB2)
Photosensitive Drum
F-2-72
2-53