25-4.Fusing Temperature Control; 18-4.Fusing Temperature Control - Minolta Di181 Service Manual

25-4. Fusing Temperature Control
÷ The Fusing Roller Heater Lamp is turned ON and OFF to maintain a set temperature on
the surface of the Fusing Roller.
÷ The Fusing Roller surface temperature is detected by using a thermistor that translates
the temperature to a corresponding electrical signal.
÷ If the Fusing Roller temperature becomes excessively high, the Fusing Roller Heater
Lamp is shut down.
Part Name
Fusing Heater
Lamp
Thermistor
Fusing
Thermoswitch
Fusing Roller surface
temperature
Less than 90 °C
Less than 150 °C
More than 150 °C
Symbol
÷ Turns ON during the warming-up cycle.
÷ Turns ON during a copy cycle.
H1
÷ Turns ON in the standby state following
warming-up.
÷ Detects the surface temperature of the
Upper Fusing Roller.
TH1
÷ Detecting an abnormally low temperature
(130 °C): C0510
÷ Detecting an abnormally high temperature
TS1 (230 °C): C0520
(Shuts down power supply to H1)
Temperature is controlled at 195 °C for 3 min. after the copier has
completed warming up, which is followed by a temperature con-
trol at 185 °C.
Temperature is controlled at 195 °C for 1 min. after the copier has
completed warming up, which is followed by a temperature con-
trol at 185 °C.
Temperature is controlled at 185 °C after the copier has com-
pleted warming up.
M-75
Function
Fusing temperature control
Controlled
Temperature
—
185 °C
—