Self-diagnosis and self-repair system for image forming apparatus.

摘要

This system has plurality of sensors 1a, 1b and 1c and a system control circuit 10 which includes a case memory portion 17 and a work script memory portion 18. In response to an application of state data from the sensors 1a, 1b and 1c, the state data is converted into a symbol. Then the symbol is evaluated to judge whether or not a fault exists and specify a fault symptom. As a result of the judgement, the fault symptom and the fault of an objective machine are determined. Then, a lot of cases stored in the case memory portion 17 are retrieved on a basis of the results of the fault diagnosis and a simulation of a fault state. A case close to the present state of the objective machine is detected. Repair work based on the detected case is executed.