Muratec MFX-2550 Field Engineering Manual page 40

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 malfunc-
tion, 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
N
L
Fusing temperature
1) Warming Up
2) Printing
3) Ready
4) Energy save mode In this mode, saving the power.
Temperature
( F) ( C)
402 206
365 185
338 170
230 110
Warming up
Power ON
Power supply unit
Heater
on/off switch
Main switch
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 ap-
prox. 140 °C.
When the printer obtains the printing command from its controller, the Heater
Roller is maintained at 170, 185 or 206 °C .
After printing, the printer turns to ready mode. The fuser kept at low tempera-
ture.
The Heater Roller maintained at approx. 110 °C.
Printing
Main Control PCB
Fusing temperature
control circuit
Fusing unit
Thermostat
Post card, envelope, or transparency
Small size paper (A5 and half-letter)
Energy save mode
Ready mode
2-11
Thermistor
Heater Lamp
Thermal cut-off
Time