An apparatus for monitoring and controlling electrical parameter of animaging surface, the monitoring controlling apparatus including a patch generator forrecording a first control patch at a first voltage level and a second control patch at asecond voltage level on the imaging surface; electrostatic voltmeter for measuringvoltage potentials associated with said first control patch and second control patch. Aprocessor, in communication with said patch generator, calculates the electricalparameters of the imaging surface from the measured voltage potentials from said firstand second control patches. The processor determines a deviation between thecalculated electrical parameters values and setup values. Then, the processorproduces and sends a feedback error signal to said patch generator if said deviationexceed a threshold level. The patch generator records a third control patch at a thirdvoltage level on the imaging surface upon reception of said error signal The ESVsenses said third control patch. The processor calculates the electrical parameters ofthe imaging surface from the measured voltage potential of the third control patch anddetermines a correction factor. The charging device, exposure system and developerare adjusted in accordance to said correction factor
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