(57) An automated process and apparatus for establishing the basic xerographic operating
parameters for an electophotog- raphic printing machine. The document scanning means
(42, 43, 44, 45) is used in a setup mode to generate test patches (100, 102, 104,
106) of varying density on the machine photoreceptor (10). The levels are measured
and compared to pre-set values stored in a digital controller memory until convergence
is obtained along three separate points on the photo-induced discharge curve (PIDC)
(see Figure 2). The controller (31) adjusts the system parameters of charge circuit,
developer bias and system exposure in an iterative process and corresponding to the
PIDC for the particular machine.
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