Directive diagnostics

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G - Physics

03

G

314/7

G03G 15/00 (2006.01) G01R 31/00 (2006.01)

Patent

CA 1192599

ABSTRACT OF THE DISCLOSURE Briefly, the invention is a control and diagnostic system that monitors all possible machine events and activities that pass through micro- processor control. In case a fault is detected, the control will display the particular chain (subsystem) of the machine and the last successfully com- pleted event which occurred in that chain and on the copy which caused the shutdown. These chain (subsystem) and event numbers are common to the components in a wide variety of machines and immediately provides a lower entry point in the usual fault isolation procedure. In another feature, subsystem sequencing, the Service Representative can select a chain number and then press start print. The machine will then display in sequence the numbers for the events in the selected chain as they occur and allow the Service Representative to selectively exercise the components. This feature can be provided for training purposes to aid in understanding sequence of subsystem operation. Another feature of the present invention is the use of dedicated registers in the controller to record completed events for the various chains and components in the reproduction machine. At shutdown the contents of the registers can be displayed to indicate the last completed event for a particular chain (subsystem) or for each of the chains (subsystems).

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