| 摘要 |
PURPOSE:To rapidly and easily exchange a unit for a new one by displaying exchanging requirement when use frequency becomes specified one and initializing the use frequency and erasing the exchanging requirement which is displayed by a display means at the time of detecting the new unit. CONSTITUTION:When a maintenance counter 34 count 80000, which is the speci fied use frequency NA, 'exchanging requirement' is displayed on a display plate 36 by the display means 37. A user viewes 'exchanging requirement' on the plate 36 and draws out a shield plate 30 from the attaching/detaching port 11a of a device main body 11A, and inserts a new shield plate 30A in the device main body 11A from the port 11a. When a unit detection means 31 detects the new shield plate 30A, a clearing means 38 initializes the use frequency N calculated by the counter 34 and erases 'exchanging requirement' displayed on the plate 36 by the means 37. Thus, the unit is rapidly and easily changed for the new one. |
