HP Color LaserJet Professional CP5220 Service Manual - Page 26
Fuser-control circuit
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Fuser-control circuit The fuser-control circuit monitors and controls the temperature in the fuser. The product uses ondemand fusing. The fuser-control circuit consists of the following major components: ● Fuser main heater (H1): heats the center of the fuser sleeve ● Fuser sub heater (H2): heats the ends of the fuser sleeve ● Thermistors; detects the fuser temperature (contact type) ◦ Sleeve thermistor (TH1): Detects the temperature at the center of the fuser sleeve ◦ Main thermistor (TH2): Detects the temperature at the center of the fuser heater ◦ Sub thermistor 1 (TH3): Detects the temperature at the end of the fuser heater nearest the front of the product ◦ Sub thermistor 2 (TH4): Detects the temperature at the end of the fuser heater nearest the rear of the product ● Thermal fuse (FU1): prevents abnormal temperature rise in the fuser heater (non-contact type) Figure 1-6 Fuser-control circuit TH3 Pressure roller Front of engine H1 H2 TH4 TH1FU1 TH2 FUSER HEATER CONTROL signal Low-voltage power supply Fuser heater control circuit Fuser sleeve FUSER TEMPERATURE signal DC controller Fuser heater safety circuit 14 Chapter 1 Theory of operation ENWW