| 摘要 |
A CPU saves a portion of device data stored in a device memory into a save memory every time a scanning process is performed so that the device data can be reliably saved even if a voltage holding time is shortened due to degradation of an electrolytic capacitor, and when a power-failure detecting circuit detects power failure of a main power supply, the CPU saves a remaining portion of the device data stored in the device memory using a power supply held by the electrolytic capacitor. When a capacity of the electrolytic capacitor detected by a capacitor-capacity detecting circuit is reduced, the CPU changes a size of the device data to be saved by a saving process performed every time the scanning process is performed according to the capacity of the electrolytic capacitor detected by the capacitor-capacity detecting circuit such that the size of the device data to be saved every time the scanning process is performed is increased.
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