Theory of Operation Ver. 8.0 Jun. 2008
19. Fusing section
1
29
2
Composition/Operation
19.3 Operation
19.3.1
Heating roller structure
• The inside surface of the heating roller is formed with Ni layer.
• Ni layer of the heating roller is the nonmagnetic conducting layer in which eddy current is
generated with magnetic flux.
19.3.2
Whole area heating/Center heating switch control
• The heating system will be switched from whole area heating to center area heating in
order to prevent the edge temperature from heating up while the small size paper passes
or during standby mode.
• When the demagnetization coil turns ON, the magnetic field around the end of the Main
coil is degaussed and only center area of the soaking roller is heated.
A00JT2C230AA
Fusing belt
Ni layer (coated back side)
Fusing roller
• The demagnetization coil is controlled with the heating roller thermistor/3.
• Each demagnetization coil is controlled to turn ON or OFF according to the CD length
and the temperature of the heating roller at its end.
• The main coil is identified by the wire color of the + side for correct application in a spe-
cific model: orange for
MF
550/
MF
45
0
.
2
2
2
A00HT2C301AA
Y107522-3 Theory of Operation
