Casio DT-900 Operation Manual page 52

Setting the Unit
2
Remove the installation covers (L, R).
3
Attach the wall units. Insert the wall units into
the holes, and then fix them in place by sliding
them downwards.
4
Remove the two screws (one each at the top
and bottom) that secure the base to the
Satellite Cradle.
5
Pressing down on the four corners of the
Satellite Cradle base, unhook the tabs, and
remove the base from the unit.
E-54