Fusing Temperature Control Circuit - Muratec F-315 Field Engineering Manual

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 is
malfunction, the thermal cut-off shuts down the power to the heater lamp.
AC Inlet
Main switch
L
N
Fusing temperature
1) Warming Up After the initialization of the printer, warming up of the printer starts and the
Heater Lamp turns ON until the temperature of the Heater Roller reaches
approx. 200 °C.
2) Printing When the printer obtains the printing command from its controller, the Heater
Roller is maintained at 200 °C.
After printing, the printer turns to standby mode. The fuser kept at low
temperature.
3) Standby mode The Heater Roller maintained at approx. 130°C.
4) Energy save mode In this mode, saving the power.
Temperature
( F) ( C)
401 205
392 200
393 195
248 130
Warming
up
Power ON
Power supply unit
Heater
on/off
switch
Thermostat
Post card printing only
OHP
Printing
Standby mode
2-16
Main Control PCB
Fusing temperture
control circuit
Fusing unit
Thermistor
Heater Lamp
Thermal cut-off
Energy save mode
Time