Fuser-heater protective function
The fuser-heater protective function detects an abnormal temperature rise of the fuser and interrupts the
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 thermistor. The DC controller deactivates
the FUSER HEATER CONTROL signal and releases the relay (RL1001) to interrupt the power supply to the
fuser heater when it detects an abnormal temperature.
●
Fuser-heater safety circuit
The fuser-heater safety circuit monitors the detected temperature of the thermistor. The fuser-heater
safety circuit releases the relays (RL1001 and RL1002) or deactivates the fuser-heater control circuit to
interrupt the power supply to the fuser-heater when it detects an abnormal temperature.
●
Thermoswitch
The contact of the thermoswitch is broken to interrupt the power supply to the fuser heater when the
temperature of the fuser heater is abnormally high.
●
Current detection circuit
The current detection circuit monitors the current flowing through the fuser heater control circuit. The
current detection circuit releases the relays (RL101, RL102) to interrupt power supply to the fuser
heater when it detects an abnormal current value.
The DC controller deactivates the FUSER HEATER CONTROL signal to interrupt power supply to the fuser
heater when the current of the CURRENT DETECTION signal is higher than a specified value.
12 Chapter 1 Theory of operation ENWW
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