Epson AcuLaser C1900 Reference Manual page 264

Moving the printer together with an optional lower cassette installed
Follow these steps to move the printer together with the optional
500-Sheet Paper Cassette Unit:
1. Turn off the printer and remove the following items.
Power cord
Interface cable
2. Lift the printer together with the optional unit.
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Cleaning and Transporting the Printer
Caution:
Do not move the printer on angled or uneven surfaces.