Conway Engineering, Inc.

Lawrence T Pena

Gary C Fields

Mark E Stamos

A microprocessor controlled system for testing and selectively reconditioning a CRT in accordance with the Beltron process. The microprocessor monitors the function and filament voltage selection switches actuated by an operator. Once the filament voltage and functions have been specified, the microprocessor automatically controls the application of filament voltage, AC voltage and relatively high DC voltage to the CRT and displays the progress and results of the selected function. The system tests the emission characteristics of the cathode in each gun element, causes simultaneous cleaning of the cathode/grid elements by controlling the application of an AC voltage across each cathode/grid circuit while the filament voltage is at an elevated level, and restores those cathode/grid circuits requiring restoration by controlling the application of a relatively high DC voltage to each cathode/grid circuit in serial fashion for the several gun elements while maintaining the filament voltage at an elevated level. The system substantially reduces required operator interaction with the testing and reconditioning procedure and provides a commensurate reduction in the probability of destruction of a CRT by operator error.

Microprocessor controlled system for testing and selectively

A coin telephone message and management system is provided for use at a central office location of a telephone system with a plurality of conventional remotely located coin telephone stations and with, or in place of, an automated coin subsystem to which the coin telephone stations are otherwise connected by coin trunks. The coin telephone message and management system comprises a plurality of programmable line interface units each being connected to a said coin trunk for monitoring electrical signals present on the coin trunk indicative of usage of the station connected thereto, for delivering predetermined messages to a user of the station, and for generating electrical signals emulative of operation of the station for thereby controlling the automated coin subsystem; a message storage and delivery unit selectively connectable to the programmable line interface units for delivering at least one selectable audio message to the user of a said station via the coin trunk; and, a programmed system controller for coordinating operations of the programmable line interface units and the message storage and delivery unit for delivery of selected messages to the user of a said station, for responding to data entered by the user of a said station and for causing electrical signals emulative of operation of the station to be generated by the line interface unit.

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San Carlos, CA, United States of America

Lawrence T Pena