Fuser Unit; Fuser Unit Overview - Samsung MultiXpress K7 Series Service Manual

2.6. Fuser Unit

This section describes the image fusing process used by the machine.

2.6.1. Fuser Unit Overview

This unit fuses the toner that was transferred by the transfer roller onto the paper, by applying heat and pressure to complete
the fusing process. This machine uses an instant fusing system(NIF type).
NOTE
This fuser unit is commonly used for MX X7(Color) and K7(Mono) series.
1) Lamp Halogen
The fuser unit has two halogen lamps. One heats the center of the fusing belt, the other heats the end of axial direction.
These halogen lamps are lit alternately to heat the fusing belt. Each lamp has its coil in a different location. The coil of
the center heater lamp is in the center, those of the side heater lamp are on both sides. The lamps are fixed inside of
the fusing belt. When rotating the fusing belt, these lamps does not rotate.
2) Belt Fuser
The belt fuser gets heat from the halogen lamp and transfer it to toner and paper. The belt fuser consists of three
thin-layers. The thin fusing belt reduces warming up time and mode changing time. To prevent the fusing belt from
adhering to the toner, the surface of the fuser belt is fluorinated. There is a Nip inside the fusing belt. To maintain the
proper Nip between the fusing belt and pressure roller, the spring is used.
3) Roller Fuser Pressure
The pressure roller ensures proper nip width between the pressure roller and fusing belt. It is made up of the soft silicone
sponge rubber. And, it is driven by the driving system and drives the fusing belt.
4) Thermistor (NC sensor)
NC sensors (non-contact type thermistors), located near the center and the end of the fusing belt, control the temperature
of the fusing belt.
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2. Product Specifications and Description
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