Samsung ML-651x series Service Manual page 34

2.2.5.3 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.
1) Thermostat
When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over- heating.
- Thermostat Type : Non- Contact type THERMOSTAT
- Control Temperature : 195℃ ± 5℃
2) Thermistor
It is a temperatrue detecting sensor.
- Temperature Resistance : 7㏀ (180℃ )
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 Tefl on, 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
Tefl on. When a paper passes between a heat roller and a pressure roller, toner adheres to the surface of a
paper permanently.
5) Halogen Lamp
- Capacity : 1300 Watt
• center lamp : 700 ± 35 Watt
• side lamp : 600 ± 30 Watt
Service Manual
ML-551x / 651x series
2. Product specifi cations and descriptions
2-23
Heat roller Heat roller
Pressure roller Pressure roller
Samsung Electronics