Table 1-5 Fuser control components Component name Function H1 Fuser main heater Heats the center area of the fuser film H2 Fuser sub heater Heats the edge of the fuser film TH1 Main thermistor Detects the center temperature of the fuser heater (contact type) TH2 Sub thermistor 1 Detects the temperature at one end of the fuser heater (contact type) TH3 Sub thermistor 2 TH4 Sub thermistor 3 FU1 Thermal fuse Prevents an abnormal temperature rise of the fuser heater (non-contact type) 10 Chapter 1 Theory of operation ENWW