Xerox PHASER 6130, Service Manual

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Phaser 6130 Color Laser Printer Service Manual 2-41
Theory of Operation
Fuser Control
Fuser Temperature Control
After the target temperature is set, the Heat Roller surface temperature is
controlled so at that it can be the target temperature by turning the Heater
Lamp On/Off.
Temperature of individual area of the Heat Roller is detected by the Fuser
Non-Contact Sensor (NCS) in the middle of the Heat Roller and the Temp
Sensor at the edge of it. When the temperature is detected higher than the
target, the Heater Lamp will turn Off. When the temperature is lower than the
target, the Heater Lamp will turn On.
The target temperature set up varies depending on the time of Warm-up,
Printing, or Process Control. The target temperature will be changed based
on the interior temperature detected by the Humidity Sensor.
Cool Down
As printing continues, the distribution of temperature in the Heat Roller
becomes uneven in both the paper feed and non-paper feed areas. Cooling
Down suspends paper feeling for a certain period of time so that the Heat
Roller temperature distribution can be uniform.
When the temperature of the Heat Roller edge is high, cooling down is
performed to lower the temperature to the target value.
Sensor Warm-Up
The Fuser Non-Contact Sensor at the center of the Heat Roller will lose its
accuracy of detecting temperature when the temperature of the Sensor itself
is below
-5°
C
.
Therefore, the Sensor will be warmed up when the temperature
is below
-5°
C. This process is called Sensor Warm-Up.