Fuser temperature control The fuser temperature control maintains the temperature of the fuser heater at its targeted temperature. The DC controller monitors the FUSER TEMPERATURE (FSRTH1, FSRTH2) signals and sends the FUSER HEATER CONTROL (FSRD) signal according to the detected temperature. The fuser heater control circuit controls the fuser heater depending on the signal so that the heater remains at the targeted temperature.
Figure 1-12 Fuser-heater control circuit 18 Chapter 1 Theory of operation ENWW Engine controller unit RL1002 Fuser heater control circuit Fuser control circuit DC controller Frequency ZEROX detection circuit RL1001 Relay control RLYD circuit Fuser heater safety circuit FSRTH2 FSRTH1 FSRD RL1002 Fuser heater control circuit Frequency detection circuit RL1001 Relay control circuit Fuser heater safety circuit FSRTH2 FSRTH1 FSRD Fuser film TH2 TP1 TH1 H1 H1: Fuser heater TP1: Thermoswitch Pressure roller TH1: Main thermistor TH2: Sub thermistor Fuser Fuser film TH2 TP1 TH1