M-28
(5) Fusing temperature protect control
<Soft protect>
• The comparator provided on the Controller/Mechanical Control Board is used as means
for detecting an abnormally high temperature through software approach. If the temper-
ature detected by the Thermistor (voltage value) is greater than the comparative temper-
ature 235 °C (voltage value), the triac relay is turned OFF to shut down the output of the
Heater Lamp.
<Hard protect>
• As a protection should there be a software failure, the Thermostat is used to shut down
current to the Heater Lamp when the temperature of the Fusing Roller becomes inordi-
nately high.
Electrical Component Control Signal
Low temp. High temp.
WIRING DIAGRAM
TH1 PWB-P MPJ2P-1 Analog Input F-2~3
Electrical Component Control Signal ON OFF WIRING DIAGRAM
H1 PU-1 CN1PU-1-3 L H I-7
CPU
FUSER_LAMP
ANIN
Comparative
Voltage
Comparator
High-temperature
Protect Signal
Thermistor (TH1)
Tr ia c
AC
Thermostat (TS1)
T2
T1
Fusing Roller
Heater Lamp
Controller/Mechanical Control Board Power Unit
Fusing Unit
4980M015AB
FUSER_LAMP_
RY
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