Fuser Control - Xerox Phaser 6500 Service Manual

Theory of Operation

Fuser Control

Fuser Temperature Control
Cool Down
Sensor Warm-Up
2-46
About One Half
Turn Of Belt
3. The ADC Sensor reads the patch density.
4. The amount of registration shift is calculated from the threshold value
determined in step 1 and the patch density measured in step 3.
5. The Laser Unit write timing is changed according to the amount of
registration shift.
The target temperature varies depending on the temperature detected by the
Humidity Sensor. Other factors that contribute to the target fusing temperature
include warm-up, printing, and process control.
After the target temperature is set, the heat roller surface temperature is
controlled by turning the heater lamp On/Off. Temperature of individual areas of
the heat roller (center/edge) is detected by the fuser non-contact sensor (NCS) in
the center and the temperature sensor at the edges.
As printing continues, the temperature distribution across the heat roller surface
becomes uneven. Cool down suspends feeding until heat roller temperature
distribution returns to normal.
The non-contact sensor at the center of the heat roller loses accuracy when the
sensor temperature is below -5° C. Therefore, the sensor is warmed up when the
temperature is below -5° C.
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Phaser 6500/WorkCentre 6505 Service Manual