Fusing Temperature Protect Control - Konica Minolta Di1610 Service Manual

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Fusing temperature protect control

ANIN
CPU
High-temperature
Protect Signal
FUSER_LAMP
FUSER_LAMP_
RY
Controller/Mechanical Control Board
<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
TH1
Electrical Component
H1
Comparative
Voltage
Comparator
Control Signal
Low temp.
PWB-P MPJ2P-1
Control Signal
PU-1 CN1PU-1-3
M-28
Fusing Unit
Thermistor (TH1)
Fusing Roller
Heater Lamp
Thermostat (TS1)
T2
T1
Triac
Power Unit
High temp. WIRING DIAGRAM
Analog Input
ON OFF
L H
AC
4980M015AB
F-2~3
WIRING DIAGRAM
I-7