HP Color LaserJet Professional CP5220 Service Manual - Page 27
Fuser temperature control,
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Fuser temperature control The fuser temperature control maintains the fuser heater at its targeted temperature. The fuser main heater and sub heater control the temperature of the fuser sleeve. The DC controller monitors the main thermistor and the sleeve thermistor. The DC controller controls the FUSER MAIN HEATER CONTROL (FSRD1) and the FUSER SUB-HEATER CONTROL (FSRD2) signals 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 1-7 Fuser-heater control circuit AC input Low-voltage power supply Noise filter RL102 Fuser heater control circuit RL103 FU102 Zerocross circuit RLD1 RLD2 FSRD1 FSRD2 ZEROX DC controller Fuser Fuser presence circuit Improper fuser installation prevention circuit Fuser sleeve H2 H1 TH3 TH2 TH4 TH1 FU1 FUSEROPEN FUHL THERM4 THERM2 THERM1 THERM3 Fuser heater safety circuit ENWW Engine-control system 15