HP LaserJet 4v/mv Service Manual - Page 86
Functional Overview - 50 service
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Figure 5-12 5FUSSTG Image Fusing 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 quartz-halogen lamp that provides heat for the fusing process. Fusing temperature is monitored by the DC Controller PCA, via thermistor TH1. The DC Controller maintains a temperature of about 180° C during print mode. If the fusing system overheats (about 220° C), a relay opens, interrupting power to the fusing heater, causing a fuser error (50 SERVICE) message. If the fusing system exceeds 240° C, the thermal fuse will open, cutting off power to the fuser. Halogen Heater Fusing Roller Toner Paper Pressure Roller Image Fusing 5-24 Functional Overview