2. Product Specifications and Description
2.6.3. Fuser unit temperature control
When the main switch is turned on, the CPU turns on the fuser lamps. The lamps stay on until the NC sensors detect that the
standby temperature has been attained; then the CPU raises the temperature up to the printing level temperature.
■ Overheat Protection
The CPU cuts power to the fusing lamp in the following cases :
•
The belt temperature detected by the NC sensors keeps higher than 220°C for 20 sec.
•
The belt temperature detected by the NC sensors keeps higher than 230°C for 3 sec.
•
The relay off works when belt temperature detected by the NC sensors is higher than 230°C
The following components are used when thermistor overheat protection fails :
•
Two thermostats get into line with the common ground wire of the fusing lamp.
•
If one of the thermostat temperatures becomes higher than 195°C, it opens and cuts power to the fusing lamp. If the
other thermostat temperature becomes higher than 195°C, it also opens and cuts power to the fusing lamp.
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