HP Color LaserJet Professional CP5220 Service Manual - Page 28
Fuser protective function, temperature of the main and sub thermistors is abnormal.
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Fuser protective function The protective function detects an abnormal temperature rise of the fuser unit and interrupts power supply to the fuser heater. The following three protective components prevent an abnormal temperature rise of the fuser heater: ● DC controller ◦ The DC controller interrupts power supply to the fuser heater when it detects an abnormal temperature of the fuser heater. ● Fuser-heater safety circuit ◦ The fuser heater safety circuit interrupts power supply to the fuser heater when the detected temperature of the main and sub thermistors is abnormal. ● Thermal fuse ◦ The thermal fuse is broken to interrupt power supply to the fuser heater when the thermoswitch detects an abnormal temperature of the fuser heater. 16 Chapter 1 Theory of operation ENWW
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