Fusing - Epson AcuLaser M2000D Service Manual

AcuLaser M2000D/M2000DN/M2010D/M2010DN

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.
OPERATING PRINCIPLES
Actuator
(exit sensor)
Separators
Press roller
Exit sensor
Fuser unit
Fuser thermal cutout
Fuser
heater
lamp
Technical Explanation of Print Process
Upper fuser Fuser thermal
Fuser thermistor
frame
Press spring holders Fuser lever L (R)
Figure 2-16. Fuser section
LVPS
L
YC103-6
YC102-1
YC103-7
N
YC102-3
YC103-8
Fuser
thermistor
Figure 2-17. Fuser section block diagram
Revision B
Fuser heater
cutout lamp
Heat roller
Lower fuser
frame
Fuser
bushes
Press
springs
HVPS
Main Board ASSY.
HEATN
YC811-5
SLEEP
YC811-6
ZCROSS
YC811-3
THERM
YC811-16
25
Confidential