Fuser Unit - Samsung CLX-8540ND Service Manual

2.3.3.4 Fuser Unit

The fuser unit consists of dual heat lamp, heat roller, pressure roller, fuser belt, two thermostats and
a thermistor. The fuser unit melts and fuses the toner, onto the paper, by applying pressure and high
temperature to complete a printing job.
- Fusing Type : [Dual Lamp Heating, 700W/500W]
- Heat Roller :[ø18 ]
- Pressure Roller : [ø29 electrically conductive]
- Thermistor – Temperature Detecting Sensor
contact thermistor 2EA
- Thermostat – Overheat Protection Device
- Fuser Bias : 700V(HH), 500V(LL,NN)on the P/R tube
① Thermostat
When a heat lamp is overheated, a Thermostat cuts off the main power to prevent over-heating.
- Non-Cotact type Thermostat
② Heat roller
The heat roller transfers the heat from the lamp to the belt. The surface of a heat roller is coated with
Dickel coating, so toner does not stick to the surface.
③ 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, toner adheres to the surface of
a paper permanently.
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