Fuser protective function
The protective function detects an abnormal temperature rise of the fuser and interrupts power supply to the
fuser heater. The following protective components prevent an abnormal temperature rise of the fuser
heater.
●
DC controller
The DC controller monitors the detected temperature of the thermistors. It deactivates the fuser heater
control signal and releases the relay to interrupt the power supply to the fuser heater under the
following conditions.
◦
Main thermistor: 253°C (487.4°F) or higher
◦
Sub thermistor 1: 273°C (523.4°F) or higher
◦
Sub thermistor 2: 273°C (523.4°F) or higher
●
Fuser heater safety circuit
The fuser heater safety circuit monitors the detected temperature of the thermistors. It releases the
relay to interrupt the power supply to the fuser heater under the following conditions.
◦
Main thermistor: 320°C (608°F) or higher
◦
Sub thermistor 1: 295°C (563°F) or higher
◦
Sub thermistor 2: 295°C (563°F) or higher
●
Thermal fuse
The thermal fuse blows to interrupt power supply to the fuser heater if the thermal fuse temperature
reaches 228°C (442°F) or higher.
12 Chapter 1 Theory of operation ENWW
To Next Page
Loading...