PURPOSE: To improve workability by forming a panel for controlling the self- diagnosis of a device having a self-diangosing machine into a moving system.

CONSTITUTION: The electrical circuits of an example of the case when a panel 20 for controlling self-diagnosis to a copying machine having a control panel 3 are illustrated. Arrangement is so made that an operation part 2, the panel 3, and the panel 20 can be controlled through a connector board 5, and the cost is reduced by separating a body 1 of the copying machine, the connector board 5 and the panel 20. Since the panel 20 is of a moving system, workability is improved.