HP LaserJet Pro P1606 HP LaserJet Professional P1560 and P1600 Series Printer - Page 36
Fuser protective function, Pressure roller cleaning
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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 thermistor is abnormal. ● Thermoswitch ◦ The contact of the thermal fuse is broken to interrupt power supply to the fuser heater when the thermal fuse detects an abnormal temperature of the fuser heater. Pressure roller cleaning The pressure roller cleaning process is initiated by the formatter. The process removes toner that has accumulated on the pressure roller by transferring it to a sheet of paper. ● The product feeds a sheet of paper after receiving the cleaning command from the formatter. ● Main motor rotation is stopped when the trailing edge of the paper passes through the transfer roller. ● The main motor rotation is repeatedly started and then stopped. The fuser heater is turned on and then off at the same interval as main motor rotation. ● Toner adhered to the pressure roller is fused to the paper. ● The paper is ejected from the product. 18 Chapter 1 Theory of operation ENWW