IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING AN IMAGE FORMING APPARATUS

An image forming apparatus has a normal mode and an energy-saving mode. The image forming apparatus includes a plurality of components, a power supply which stops supplying electric power to supply-stop parts in energy-saving mode, a monitor which makes the power supply restart supply of electric power to the supply-stop parts when a recovery factor to normal mode occurs (an interrupt signal occurs), an automatic recovery signal generator which inputs an automatic recovery signal, which is a kind of interrupt signal, to the monitor after completion of transition to energy-saving mode, and an arithmetic processor which, when an error occurs during the transition period, performs recovery preparation processing to have the automatic recovery signal input to the monitor after completion of transition to energy-saving mode.