4-15
FS-1900
(5) Fusing
The toner on the paper is molten by heat and pressed into the paper as it passes between the heat
roller A and the press roller B in the fuser unit.
Figure 4-1-13 Fusing
The heat roller A has a heater (infrared) lamp C inside which continuously turns on and off by the
thermistor to maintain the constant temperature on the heat roller A surface. The fusing temperature
is also controlled based on paper types. See the table in the figure above.
The heat roller A 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 A not to scratch the roller surface as
doing so may result in quality problems.
The heat roller A has four scraping claws (Separators) D 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 A causing paper jam.
The press roller B is made of the heat resistant silicon rubber. This roller is used to strongly press
the paper towards the heat roller A by means of coil springs.
The temperature of the heat roller A is constantly monitored by the engine board using the thermistor
and triac. Should the temperature of the heat roller A exceed the predetermined value, the thermal
cutout is activated to effectively disconnect the heater lamp C from power.
A
C
HEATON*
AC power
off/on
output
THERM
Engine
board
YC202-11
YC202-6
Power
supply
unit
Thin
Normal
Thick
Thin
Normal
Thick
Normal
Thick
A4
B5
Ready
A5 or
smaller
Paper type
Fusing control temperature
Temperature
B
D
175 °C
188 °C
190 °C
188 °C
190 °C
195 °C
188 °C
190 °C
150 °C
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