SERVICE MANUAL - O. Rensch OHG

2DC
(6) Fusing
The toner on the paper is molten and pressed into the paper as it passes between the heat roller A and the press roller
B in the fuser unit.
A
B
Figure 2-1-16 Fusing
The heat roller has a halogen lamp inside which continuously turns on and off by the thermistor to maintain the constant
temperature onto the heat roller surface.
The heat roller is resin coated by florin to prevent toner from accumulating on the roller after a long run. Care must be
taken while handling the heat roller not to scratch the roller surface as doing so may result in print problems.
The heat roller has four claws which are continuously in contact with its surface. These claws prevent the paper on which
toner has been fused from being wound around the heat roller causing paper jam.
The pressure roller is made of the heat-resistant silicon rubber. This roller is used to strongly press the paper towards the
heat roller by means of coil springs.
The temperature of the heat roller is constantly monitored by the engine board using the thermistor and triac. Should the
temperature of the heat roller exceed the predetermined value, the thermal cutout is activated to effectively disconnect
the heater (halogen) lamp from power.
2-1-16