Ricoh Beluga-C1 Training page 219

Temperature Control During Copying
The machine maintains the correct fusing temperature with
two functions: Pressure Feedback Control and CPM Down.
Feedback Control
CPM Down
Slide 219
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The machine uses readings from the pressure roller
thermistors (center and ends). If the temperature gets too
low, the fusing unit idles to get the roller to the correct
temperature.
If feedback control cannot maintain the correct fusing
temperature, CPM down takes over.
CPM down adjusts the paper feed timing to create a wider
interval between sheets of paper in the paper feed path.
A wider gap between sheets allows the hot roller more time
with no paper between the rollers, so the hot roller can
transfer more heat to the pressure roller.
The machine uses the difference between the pressure
roller temperatures at the end and the center to control
CPM down. Readings from the hot roller thermistors are not
used.
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Beluga-C1/C1.5 Training