Abstract: A system for managing printing system memory in which a state of a printing system subsystem is altered between a first state and a second state by reference to a substrate including machine readable code, such as bar code. The system includes a raster image processing device for scanning the substrate to read a representation of the machine readable code. In response to receiving an authorization signal, a value in memory is altered and the state of the printing system subsystem is changed from the first state to the second state.

Abstract: An apparatus for dispersing and/or transporting/migrating particles such as toner that may be prone to agglomeration in a particle dispensing system. Movement and/or vibration of the dispersing and migrating plate member serves to break up, clear and prevent particle agglomerations. Perforations, slits or mesh areas in the upper surface of the plate member can prevent oversize particles/agglomerations from passing through the system, while side walls, fins or disposing the plate member at a angle can channelize the dispersion of the particles contacting the upper surface of the plate member.

Abstract: A method of maintaining consistent large solid area development by developing a large area test patch covering the image area of a photorececptor and detecting the lead edge and trail edge density of the test patch using a densitometer to measure reflectance. If a density differential between lead and trail edge density is detected, electrostatic parameters such as toner concentration, developer bias, and photoreceptor potential are adjusted to maintain constant large solid area development.