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PRIMERGY RX300 S3 User's Guide
7
Installing Internal Options
5 Install the expansion card.
Attach the expansion card firmly to the connector of the riser card and fix it by returning the slot 
cover lock.
6 Install the riser card in the server.
Attach the riser card firmly to the connector of the server and fix it by tightening the hand screw.
7 Attach the top cover.
"7.2 Installing/Removing the Top Cover" (pg.182)
8 Push the server back into the rack.
■ How to Remove an Expansion Card
To remove expansion cards, simply reverse the installation procedures.
Hand screws
Riser card