Auxiliary Control; Startup Contrast Potential (Vcont) Correction - Canon imageRUNNER ADVANCE 8105 Series Service Manual

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Technology > Image Formation System > Controls > Auxiliary Control
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Auxiliary Control

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Startup Contrast Potential (Vcont) Correction

Contrast potential (Vcont) is corrected to keep a constant density and prevent light image
caused by reduced toner charging amount in an energy-saving environment.
MEMO:
Temperature in the Developing Assembly is reduced because the Drum Heater
is turned OFF at sleep state in an energy-saving environment. This operation
increases moisture content in the Developing Assembly and reduces toner
charging amount.
Execution timing
At the time of the normal startup mode (in the case that the two dimension shading control is
OFF)
MEMO:
This control is not executed when the two dimension shading control is ON
because the Drum Heater is turned ON.
Control description
1) At the time of normal image formation, contrast potential (Vcontα) based on the
environment table is added to the developing bias (Vdc (full potential control value))
determined by the full potential control to correct developing bias.
Vdc=Vdc (potential control value) –Vcontα
2) The corrected contrast potential (Vcont) is reset (making Vcontα 0) when the next full
potential correction is executed.
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Technology > Image Formation System > Controls > Auxiliary Control
Potential changes depending
on laser emission
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Vd : Dark area potential
V : Light area potential
L
Vdc : Developing DC potential
Vcont : Contrast potential
Vback : Fogging removal potential
F-2-111 F-2-111
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