Ricoh Beluga-C1 Training page 227

Fusing Motor Speed Adjustment
During paper feed, the speed of the fusing roller
increases slightly, so that the fusing roller
rotates faster than the registration roller.
This pulls the paper tight to keep it straight.
The tension on the paper could cause the paper
to snap out of the nip of the registration roller and
cause "jitter" in the image if the speed is not
corrected before the paper leaves the registration
roller.
This line speed adjustment is done only for paper
sizes narrower than 297 mm.
When the trailing edge of the paper is 50 mm
before the nip of the registration roller, the fusing
motor slows by -5%.
This can be adjusted with SP1918.
Slide 227
Also, at about the same time, the registration motor speeds up slightly, as
described in the Paper Feed section.
The speed control adjustment is not done for paper shorter than 250 mm (9.8 in.)
Fusing starts after the line speed has been slowed and the trailing edge has left
the registration roller.
The speed control setting of SP1918 is not done and the speed is increased after
the trailing edge clears.
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Beluga-C1/C1.5 Training