Patent ID: 8457505

Claim:
An image forming apparatus comprising: a fixing part including: a heating body incorporating a heater heated through power distribution, the heating body heating paper with a toner image transferred thereon, and a pressurizing body making pressure-contact with the heating body and pressurizing the paper with the toner image transferred thereon; a power source part receiving power from outside, and then supplying power to the heater and also generating a voltage for driving a control part; a main switch for turning ON/OFF the power supply from the outside to the power source part; an interrupt signal generation part generating a periodical interrupt signal based on the power supplied from the outside; and a control part controlling ON/OFF of the power distribution to the heater based on the generation of the interrupt signal by the interrupt signal generation part, wherein the control part also turns OFF the power supply to the heater upon passage of a predetermined time since disappearance of the interrupt signal, the control part judges that an error has occurred when it is still driving after passage of a driving stop time since the disappearance of the interrupt signal, and the driving stop time is a time by which the driving part would stop driving after the main switch were turned OFF, and is longer than the predetermined time since the disappearance of the interrupt signal.