Use the procedures in "Removing a Board", to remove the applicable I/O+ board.
If a PCI card is already installed in the slot designated for replacement of the riser card, remove the card as indicated in "Removing a PCI Card".
If there is no PCI card presently installed, proceed to Step 1.
Remove two screws securing the existing riser card to the PCI+ I/O board (Figure 4-26) and remove the riser card.
Secure the new riser card onto the PCI+ I/O board using the two screws removed in Step 1.