2. Product Specifications and Description
2.6.3. Fuser unit temperature control
When the main switch turns on, the CPU turns on the fusing lamp. The lamp stays on until the NC sensors detect the standby
temperature. Then the CPU raises the temperature up to the printing temperature.
■ Overheat Protection
The CPU cuts power to the fusing lamp in the following cases :
•
The Fuser Belt temperature is detected by the NC sensor, and if it detects an overheat condition it will shut down
power to the Fuser.
•
The heating temperature is detected by a thermistor and if resistance is so low that the Main Board detects an overheat
condition; it will disable the Control Circuit for the Fuser on the Main Board.
The following components are used when thermistor overheat protection fails :
•
Two thermostats for the fuser belt are on the neutral side of the AC line of the fusing lamp.
•
If ither one of the thermostats detect temperatures that become higher than 190°C, it opens and cuts power to both
fusing lamp.
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