To easily recognize what causes such abnormality coping action as power feeding stop performed by plural abnormality detecting parts by a hardware.

The contact point of a relay 46 is disconnected by an optional abnormality detecting signal from the plural abnormality detecting parts 31, 34; 32, 35; 37, 39; 38, 40 of plural hardwares, and power feeding to an original exposing lamp 19 and a fixing heater 21 is stopped. The output of each abnormality detecting part is successively fetched into an error status register 50. The contents of the register 50 can be confirmed by a display part 15. Just after one abnormality detecting signal is fetched in the register 50, a new abnormality detecting signal is restrained from being fetched. Thus, the abnormality detecting signal generated secondarily by the power feeding stop due to the previously occurred abnormality can be ignored.