Specifications

<Temperature Control>
•
Upper Fusing Roller Thermistor TH1 and Lower Fusing Roller Thermistor
TH2 detect the surface temperatures of the corresponding rollers. They
provide analog voltage inputs to pin 7 of PJ5A (TH1) and pin 3 of PJ5A
(TH2) on Master Board PWB-A, respectively. This controls the fusing
temperature.
•
H1 is turned ON or OFF by the Remote signal output from pin 3 of PJ7AA
on PWB-A.
•
H2 is turned ON or OFF by the Remote signal output from pin 2 of PJ7AA
on PWB-A.
•
H3 is turned ON or OFF by the Remote signal output from pin 1 of PJ7AA
on PWB-A.
Temperature °C
Upper Fusing Roller Thermistor TH1
Lower Fusing Roller
Thermistor TH2
170 180 190 200 220 130 140 150
Analog Output
Voltage (V)
Approx.
2.12
Approx.
1.82
Approx.
1.57
Approx.
1.35
Approx.
0.96
Approx.
1.64
Approx.
1.37
Approx.
1.13
Detection of an Abnormally High Temperature
When TH1 detects an abnormally high temperature (220°C or higher), the
output from IC24 on PWB-A goes from LOW to HIGH causing the
Self-Holding signal to PJ5C on DC Power Supply Board PWB-C to go
LOW, which turns OFF RY1. This cuts off power to the heater lamps,
turning them OFF.
1075C24MAA
M-173