AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision B
OPERATING PRINCIPLES Technical Explanation of Print Process 25
Confidential
2.2.6 Fusing
The toner on the paper is molten and pressed into the paper as it passes between the
heat roller and the press roller in the fuser unit. The heat roller has a heater lamp inside
which continuously turns on and off by the fuser 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. Fuser temperature is optimized to the paper type. The heat roller has
four separators (claws) which are continuously in contact with its surface. These
separators (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 press springs. The temperature of the heat roller is constantly monitored by
the main board assy. using the fuser thermistor. Should the temperature of the heat
roller exceed the predetermined value, the fuser thermal cutout is activated to
effectively disconnect the heater lamp from power.
Figure 2-16. Fuser section
Figure 2-17. Fuser section block diagram
Upper fuser
frame
Lower fuser
frame
Heat roller
Separators
Fuser heater
lamp
Fuser thermal
cutout
Fuser thermistor
Actuator
(exit sensor)
Press roller
Exit sensor
Fuser lever L (R)Press spring holders
Press
springs
Fuser
bushes
N
L
THERM
HEATN
SLEEP
ZCROSS
YC102-1
YC102-3
YC103-6
YC103-7
YC103-8
YC811-5
YC811-6
YC811-3
YC811-16
Fuser unit
Fuser
thermistor
Fuser
heater
lamp
Fuser thermal cutout
LVPS
Main Board ASSY.
HVPS
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