Image Formation System 5-31
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
Engine Controller Board, via the Thermistor TH901. The Engine
Controller Board maintains a temperature of about 383° F (195° C)
during print mode. If the Fusing System overheats (about
428° F/220° 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.
Figure 5-17 Image Fusing
For more information on the LaserJet 4000 / 4050 Visit www.PrinterSupplies.com 800-551-1943
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