Fixation heating circuit and image forming device

An image forming device comprising:

• a fixation heating circuit including:
• a mains power interface;
• a switch circuit;
• a heater;
• a temperature detection circuit;
• a switch control circuit;
• a thermistor reception terminal;
• and
• a thermistor insertion terminal;
• wherein:
• the mains power interface, the switch circuit, and the heater are connected to each other to form a heating loop;
• the thermistor insertion terminal includes first to fourth insertion terminals, a thermistor being connected between the first insertion terminal and the second insertion terminal, and the third insertion terminal and the fourth insertion terminal being connected via a wire;
• the thermistor reception terminal includes first to fourth reception terminals corresponding to the first to fourth insertion terminals, the first reception terminal and the second reception terminal being arranged in the temperature detection circuit;
• and
• the temperature detection circuit is connected to the switch control circuit, the switch control circuit being connected to the third reception terminal, and the switch circuit being connected to the fourth reception terminal.