Brother International HL-3400CN Service Manual - Page 77

CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS 1.7 Fusing Unit The fusing unit employs a thermal fusing system using heater lamps in the rollers. Paper carrying the combined toner image passes between the heat rollers. Heat and pressure is applied to the paper when passing between the heat rollers so that the toner image is melted and fused onto the paper. 1.7.1 Structure The fusing unit consists of the following component parts; (Refer to Fig.4-26.) CD Fuser roller: C) Back-up roller: 3 Fusing heaters: C) Thermistor: C) Thermal fuse: 6 Oil bottle: C) Fuser cleaner: incorporates a heater lamp. is a pressure roller and incorporates a heater lamp. halogen lamps to heat the rollers. is a sensor to detect the temperature of the fuser roller's surface. prevent the fuser roller from being excessively heated up. contains silicone oil for fusing. cleans the fuser roller. 7 4 I 1 2 5 3 Fig. 4-26 4-26