The application of Fuser thermistor products is multi-level, that is to say, it exists in many parts. The central Fuser thermistor product is the main Fuser thermistor product, which detects the temperature of the central part of the fuser roller and controls the on and off of the fuser lamp; the Fuser thermistor product on the side is a sub-Fuser thermistor product, because the paper does not pass through the heat roller and there is no paper. If it absorbs heat, both sides of the fuser roller may overheat. The sub-temperature Fuser thermistor product can detect abnormal heat generation in the area caused by the overheating of the fixing roller. Therefore, the sub-Fuser thermistor product is not used for temperature control of the fixing roller, but only monitors the abnormal temperature of the fixing roller.

The main function of the Fuser thermistor product is to adjust the fixing temperature. The Fuser thermistor product is tightly attached to the fixing upper roller or ceramic heater. When its temperature changes, its resistance changes. The logic circuit controls the switch of the heating lamp to realize the adjustment and constant temperature of the fixing temperature. Fuser thermistor products used in laser printers basically have a negative temperature coefficient. That is, the higher the external temperature, the lower the resistance of the Fuser thermistor product. When the lamp tube starts to heat up. The temperature of the heating roller gradually increases, and the resistance value of the Fuser thermistor product decreases. When the surface temperature of the heater reaches the rated temperature, the resistance value of the Fuser thermistor product also reaches the lowest value, and then the heater is controlled to stop heating through the logic control circuit. This is repeated to control the surface temperature of the heater to keep within the designed temperature range.
The role of the Fuser thermistor product cannot be underestimated. Without the existence of this electronic component, the performance of the fuser cannot be guaranteed. And relatively speaking, the quality of electronic components determines the effect and service life of the fuser. Therefore, attention to quality selection is a crucial detail.