Fusing; Fusing Temperature Control Circuit - Muratec F-360 Field Engineering Manual

2.8.6 Fusing

An Overview
The toner image that is transferred on to the paper is securely fixed during the fusing process.
A heat roller system is used as the fusing system. The toner image is fused by Heater Roller heated by
the Heater Lamp, and securely fixed by the pressure between the Heater roller and Press roller.
A Thermistor detects and controls the Heater Roller temperature.
The Thermostat functions when the Heater Lamp is not turned OFF even if the Thermistor detects a high
temperature malfunction.

Fusing Temperature Control Circuit

The Thermistor detects the surface temperature of the Heater Roller and inputs that analog voltage into
the Main Control PCB. Corresponding to this data, the Heater Lamp ON/OFF signal is output to the Heater
ON/OFF switch of the power supply unit, causing the Heater Lamp to turn ON or OFF to control the fusing
temperature.
When the Heater Lamp is not turned OFF even if the Thermistor detects a high temperature malfunction,
the thermostat shuts down the power to the heater lamp. When the thermostat malfunctions, the thermal
cut-off shuts down the power to the heater lamp.
AC Inlet
N
Power supply unit
Main switch
Heater
on/off
switch
Main Control PCB
Fusing unit
Thermostat
2-13
Fusing temperture
control circuit
Thermistor
Heater Lamp
Thermal cut-off