COROTRON ALTITUDE COMPENSATION
Original Publication Date: 1993-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
In Xerox family copiers, a 'tracking' high voltage power supply is used in which the power supply is controlled by feedback from the charge corotron shield, and the currents to the other corotrons are determined by an output network powered from a single transformer. The system works well under most circumstances, but can give large changes in charge level and corotron currents if the atmospheric pressure changes significantly. This can be a problem if, for instance, a machine is set up at a different altitude from install.