The manufacturer of the upper roller tells you that there is a halogen lamp in the upper fixing roller. The heating will melt the toner on the paper, and the lower fixing roller will press the toner to embed the toner into the paper, fix the toner, and form images and words that are not easy to erase.

The upper roller manufacturer tells you that the thermistor is divided into positive temperature coefficient thermistor, one is negative temperature coefficient thermistor. What is a positive temperature coefficient thermistor? A positive temperature coefficient thermistor is that when the temperature rises, the resistance of the thermistor increases, and the higher the temperature, the greater the resistance is proportional to, so it is called a positive temperature coefficient thermistor. The negative temperature coefficient thermistor is the opposite. As the temperature increases, the resistance of the thermistor becomes smaller. The higher the temperature, the smaller the resistance is inversely proportional, so it is called a negative temperature coefficient thermistor. The upper roller manufacturer tells you Whether it is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor, each temperature corresponds to a resistance value within the working temperature range. So we know this relationship. The resistance value of the thermal resistance is measured to know the temperature. Copiers are almost always used Negative temperature coefficient thermistor, we use the characteristics of the thermistor to detect the temperature of the heat roller, and then judge the temperature of the heat roller according to the resistance of the thermistor, and use the thermistor to build a bridge or voltage divider circuit to make the resistance Convert to the corresponding voltage.
The manufacturer of the upper roller tells you the function of the constant temperature resistance. In layman's terms, it is the temperature control switch to control the fixing temperature. When there is a problem with the circuit or other unexpected reasons, the temperature is out of control (the temperature keeps heating), then the temperature of the hot roller will rise linearly. Causes serious damage to the fixing and machine, then the temperature switch will work.