8.4TEMPERATURE CONTROL
The main board monitors the temperature of the hot roller through TH1 and the
temperature of the pressure roller through TH2. The CPU determines whether or
not to turn on the fusing lamp based on the combination of the input from these
two thermistors. If the pressure roller is cool, the CPU keeps the hot roller
temperature high. However, if the pressure roller is hot, the CPU decreases the
operating temperature of the hot roller. The above graph shows the relationship
between the temperatures of the hot and pressure rollers.
Hot Roller
Temp. (°C)
Pressure Roller Temp. (°C)
Operating Temperature
Lower Limit
Lower Limit
A163 2-31 SM
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