Installation of this unit Preparatory work for installation23Move the top panel of the Base Module to themodule to be placed at the top.≥ Lightly tighten the four thumbscrews to determine theposition and then tighten them firmly. Tighten the M3screw.≥ Rotate the thumbscrew while pushing it.≥ This step is not required if the Base Module is to beplaced at the top.≥ Remove the tape affixed to the four thumbscrews at theinterface side of the unit prior to installation, and makesure the thumbscrews are fully tightened.≥ If the thumbscrew is loose, tighten firmly.≥ If the installation is completed with loose thumbscrews,it may damage the unit or cause heavy objects to fall.≥ Confirm that there is nodust or dirt on thesurface of the changerunit so that foreignobjects do not attach tothe disks while thesystem is operating.≥ Remove any dirtexceeding 1 mm (0.04q) in diameter.Thumbscrew M3 Screw