Fuser control The fuser heater-control circuit and the fuser heater safety circuit control the fuser temperature according to commands from the DC controller. Figure 1-6 Fuser components TH3 Pressure roller TP1 TH1 DC controller Low-voltage power supply unit H1 TH2 FUSER HEATER CONTROL signal Fuser heater control circuit Fuser heater safety circuit FUSER TEMPERATURE signal Fuser sleeve Table 1-9 Fuser components Type of component Abbreviation Name Function Heaters H1 Fuser heater Heats the fuser sleeve. Thermistors TH1 Main thermistor Detects the center temperature of the fuser sleeve. (Contact type) TH2 Sub thermistor 1 Detects the temperature at one end of the fuser heater.
TH3 Sub thermistor 2 Thermoswitches TP1 For the fuser heater Controls the fuser-roller main heater (Contact type) 14 Chapter 1 Theory of operation ENWW