Abstract: An electrostatographic printing machine including a system for selectively varying set delivery output time from a finishing subsystem to an external device such as a third party supplemental-finishing apparatus. The system is adapted to allow an operator to input certain parameters such as the unload time of the external device, and the number of sheets per set for adjusting the machine output so as to be compatible with the unload time of the external device, Control circuitry is provided for inducing delays in the finishing subsystem or in the electrostatographic printing system, as desired.

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.