Q1860-90918 Chapter 5 Functional information 89
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.
The fusing roller contains a ceramic heating element that provides heat for the fusing process.
Fusing temperature is monitored by the dc controller board, a thermistor. If the fusing system
overheats (about 446° F/230° C), a relay opens, interrupting power to the fusing heater, causing
a fuser error message (
50.X FUSER ERROR). If the fusing system exceeds 464° F (240° C), the
thermal fuse will open, cutting off power to the fuser.
The dc controller board maintains a variable fuser temperature that is dependent on factors such
as the paper type set in the paper handling menu.
Figure 22. Image fusing
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