EN Chapter 5 Theory of operation 115
Image fusing/variable fusing temperature
During the fusing process, the toner is fused into the paper by heat and pressure to produce a
permanent image. The paper passes between a heated fusing roller and a soft pressure roller. This
melts the toner and presses it into the paper.
This printer utilizes an on-demand fusing method, which uses fusing film with small heat capacity.
This method has fast temperature-rising time. It is not necessary to supply power to the fuser heater
during the standby mode. Wait time is shortened and energy conservation is made possible by this
method.
The fusing roller contains a ceramic strip that contains three heating elements, providing heat for the
fusing process. Fusing temperature is monitored by the engine controller board using two
thermistors. The engine controller board maintains a temperature of about 195° C (383° F) during
print mode. If the fusing system overheats (about 240° C/464° F), a relay opens, interrupting power
to the fusing heater and causing a fuser error message (
50.X FUSER ERROR
). If the fusing system
exceeds 250° C (482° F), the thermal fuse will open, cutting off power to the fuser.
Figure 26. Image fusing
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