NEC POWERMATE PROFESSIONAL 9000 Service Manual page 162

Holding the board by its edges or its bracket, insert the board into the expansion
6.
slot.
Press the board firmly into the expansion slot connector on the riser board.
7. Use the slot cover screw removed earlier to secure the expansion board.
Figure 3-7 Installing an Expansion Board
Figure 3-6 Removing a Slot Cover
Option Installation 3-9