| 摘要 |
PROBLEM TO BE SOLVED: To make is possible to avoid trouble even when power supply from an external power source is stopped.SOLUTION: When an image forming apparatus detects that power supply from an external power source is stopped (S2), selects a power storage device (internal power source) as power supply source (S3); and determines operation to be permitted to equipment during the stoppage of the external power source according to the remaining capacity (charge level) of the power storage device at the time of the selection, and performs the permitted operation (S4 to S13). |
