Fuser Unit - Samsung ProXpress M337x Service Manual

2.2.4.3. Fuser unit

It is consisted of a halogen lamp, heat roller, pressure roller, thermistor and thermostat. It sticks the toner on a paper by
heat and pressure to complete the printing job.
Heat Roller
Pressure Roller2
1) Thermostat
When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over- heating.
• Thermostat Type : Non- Contact type
• Control Temperature : 190℃ ± 5℃
2) Thermistor
It is a temperature detecting sensor.
• Temperature Resistance : 7 KΩ(180℃ )
• Rated B-value R25/85 3370K±3% (The Rated B-value is calculated from the zero-power resistance measured
at 25℃ and 85℃)
3) Heat roller
The heat roller transfers the heat from the lamp to apply a heat on the paper.
The surface of a heat roller is coated with Teflon, so toner does not stick to the surface.
4) Pressure roller
A pressure roller mounted under a heat roller is made of a silicon resin, and the surface also is coated with Teflon. When
a paper passes between a heat roller and a pressure roller, the toner adheres to the surface of a paper permanently
through this combination of heat and pressure.
5) Halogen Lamp
• Voltage : 120 V, 115 ± 5 % / 220 V, 230 ± 5 %
• Capacity : 850 Watt ± 42.5W
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Thermistor
Thermostat
Halogen Lamp
Pressure Roller
2. Product Specifications
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