Fusing Temperature Control - MINOLTA-QMS Magicolor 2200 Series Manual

6-2 Fusing temperature control

Controller circuit
Thermistor 1 (TH1) detects the surface temperature of the heat roller and sends a temperature signal to the CPU. The
heater lamp (H1) uses the POUT signal that has been sent in response to the detected temperature of thermistor 1 to con-
trol the temperature of the heat roller by turning the heater lamp on and off with heater on/off signals.
• The surface temperature of the pressure roller is controlled by heater lamp and thermistor in the same manner as the
heat roller.
• If the POUT signal is not set off even when the thermistor has detected an abnormally high temperature (the surface
temperature of the heat roller exceeds 220°C/428°F), the RY1 relay in PU1 is set off to force the heater lamp off.
Heater ON
Heater OFF
C-28
Thermistor 2
Thermistor 1
Thermostat Heater lamp