Kyocera DISCOVER FS-3830N, Service Manual

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2FP/2FY/2FR
2-1-17
(5) Fusing
The toner on the paper is molten by heat and pressed into the paper as it passes between the heat roller and the press
roller in the fuser unit.
Figure 2-1-17 Fusing
The heat roller has a heater (infrared) lamp inside which continuously turns on and off by the thermistor to maintain the
constant temperature on the heat roller surface. The fusing temperature is also controlled based on paper types. See the
table in the figure above.
The heat roller is florin coated by to prevent toner from accumulating on the roller after a long usage. Care must be taken
while handling the heat roller not to scratch the roller surface as doing so may result in quality problems.
The heat roller has four scraping claws [Separators] 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 press 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 lamp from power.
Heat roller
Heater lamp
HEATON*
AC power
off/on
output
THERM
Engine
board
YC2-12
YC2-5
Power
supply
unit
Thin
Normal
Thick
Thin
Normal
Thick
Normal
Thick
A4
B5
Ready
A5 or
smaller
Paper type
Fusing control temperature
Temperature
Press roller
Scraping claws
(Separators)
175 C
188 C
190 C
188 C
190 C
195 C
188 C
190 C
150 C