Fuser-control circuit The fuser-control circuit monitors and controls the temperature in the fuser. The product uses on- demand fusing. The fuser-control circuit consists of the following major components:
● Fuser heater (H1); heats the fusing film ● Thermistor (TH1 and TH2); detects the fuser temperature (contact type) ◦ Main thermistor (TH1); controls the temperature in the fuser (contact type) ◦ Sub thermistor (TH2); detects a one-sided temperature rise in the fuser and controls the temperature in the fuser (contact type) ● Thermoswitch (TP1); prevents abnormal temperature rise in the fuser (contact type) Figure 1-11 Fuser control circuit H1 Fuser film TP1 TH1 Pressure roller TH2 FUSER TEMPERATURE signal FUSER HEATER CONTROL signal DC controller Fuser control circuit Engine controller unit 16 Chapter 1 Theory of operation ENWW Fuser heater control Fuser heater safety circuit circuit