| 摘要 |
PURPOSE:To ensure display and erasure by providing (n) trouble data storing ranges in which items of data are sequentially erased from the oldest one and computing a logical sum of the stored data relating to the same trouble portion at a request for trouble display and displaying troubles on the trouble item basis. CONSTITUTION:In a controlling part 2, if an accessory switch 42 is turned on when there is a lapse of ten minutes before the precedent turn-on of the accessary switch 42, each data item of the trouble data storing ranges 22d1-22d5 is shifted by one step to erase the oldest data so that the data is cleared from the range 22d1. On the other hand, a trouble, if any, of each part is located and stored in the corresponing position in the trouble data storing range 22d1. In the interruption routine processing by a timer 22C, if the accessary switch 42 and trouble content display switch are held on, the logical sum of the stored data in the trouble data storing ranges 22d1-22d5 is computed on the basis of item relating to detected trouble. And then, the lamps that correspond to the trouble items are selected among the lamps 302-306 and lit on. By use of such constitution, a trouble which cannot be observed at the repairing time will be displayed clearly so that failure of erasure of any trouble data after completion of the repairing will be prevented. |
