Patent ID: 7890005

Claim:
A method, comprising: applying a charge on a surface of a photoconductor drum to create a defined dark voltage; exposing an image area of the photoconductor drum with a printhead using a defined energy level to discharge the charge from the image area to create an exposure voltage; measuring the exposure voltage of the photoconductor drum after the image area has been exposed by the printhead; performing a first optimization to determine an adjusted dark voltage and an adjusted energy level based on the measured exposure voltage and the defined dark voltage and the defined energy level applied to the photoconductor drum, wherein performing the first optimization comprises performing a non-linear analysis to select the adjusted energy level and the adjusted dark voltage such that the measured exposure voltage of the photoconductor drum is approximately linear with respect to the adjusted energy level; applying an applicator voltage to an applicator that applies toner to the exposed image area of the photoconductor drum; measuring toner density of the toner applied to the photoconductor drum; and performing a second optimization to adjust the applicator voltage to produce a target toner density.