| 摘要 |
PURPOSE:To realize accurate diagnosis for a fault as to a self-diagnosable system for an image forming device. CONSTITUTION:A pseudo fault occurrence part 14 operates actuator controllers 2C, 3C, and 5C, then the fault is forcibly caused on the image forming device. The detection values of sensors X, VS, and DS at the time of forcibly causing the fault are read, and membership function stored in a membership function forming part 13 is corrected based on the detection values read and the detection values obtained from the sensors X, VS, and DS before the fault is caused. Then, faulty symptoms is caused on the device, and the detection values of the sensors X, VS, and DS are converted to a fuzzy qualitative values based on the corrected membership function. And the fuzzy qualitative values are compared with the set of the qualitative values outputted from an outputting part 12, so that the fault is estimated. |
