Fuser heater protective function
The fuser heater protective function detects an excessive 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:
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DC controller
◦
The DC controller monitors the detected temperature of the thermistor. The DC controller
deactivates the FUSER HEATER CONTROL signal and releases the relay (RL101) to interrupt power
supply to the fuser heater when it detects an excessive temperature.
●
Fuser heater safety circuit
◦
The fuser heater safety circuit monitors the detected temperature of the thermistor. The fuser
heater safety circuit releases the relay (RL101) to interrupt power supply to the fuser heater when
it detects an excessive temperature.
●
Thermal fuse
◦
The thermal fuse blows to interrupt power supply to the fuser heater when the temperature of the
fuser heater is abnormally high.
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.
ENWW Engine-control system 17
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