Be sure to check the following points:
The power switch is turned off.
The power cable is unplugged from the wall outlet.
The interface cable is unplugged from the printer.
If the external option is installed, remove it.
Lift the printer with two people by using the inset grips on both side of the printer, and then move it horizontally to the place where you want to install it.
If you remove the option, reinstall it.
Be sure to move the printer horizontally. To prevent toner from scattering, move the printer slowly.
If the optional paper feed unit is installed, remove it from the printer, and then move them separately.