Roland SuperNATURAL ARX-01 Owner's Manual page 10

5. From above, press down on the board at the three
locations indicated in the illustration until the latched
board holders lock into place.
Edge of the board
where the logo
is affixed
Near the cutouts
in the board
10
6. Verify that the latched board holders are locked.
7. Return the expansion board installation slot to its
original state.