Maintenance circuits and methods for copy production machines

Abstract From the Canadian patent

Abstract of the Disclosure, A copy production machine or other semiautomatic, operator-involved machine logs operations data and error, data during normal operation into a nonvolatile store. Logging is categorized for facilitating diagnostics and maintenance of the machine. During a maintenance mode log scanning methods enable efficient retrieval of the logged data via a keyboard entry system plus manual actuation of other switches used for other purposes during the normal copy production. Features of the machine can be updated via the same keyboard by entering enable bits into the nonvolatile store. In this way, all code for a programmed controller can be initialized into the machine at …