A method of calibrating an electrographic printer, comprising: a) producing a
latent image of a banded test pattern and a
solid test pattern, using a beam of a
light source of controllable power; b) developing the banded test pattern and the
solid test pattern with a toner, utilizing an
electrode with a developing
voltage; c) measuring an average toner
optical density of the developed banded test pattern and an average optical toner density of the developed
solid test pattern; and d) adjusting one or both of (i) the developing
voltage and (ii) the power and / or the
diameter of the beam such that the measured average toner
optical density of the two patterns matches, within predetermined limits, desired optical densities.