Fujitsu PRIMERGY RX2520 M5 Upgrade And Maintenance Manual page 155

Installing the SAS expander board holder
Figure 68: Installing the assembled SAS expander board holder (A)
▶ Install the connector card in the three connectors of the backplane (see
circles).
Lift up the SAS expander board holder and take care of the stand-off in
the chassis.
RX2520 M5
Hard disk drive (HDD) / solid state disk (SSD)
Upgrade and Maintenance Manual 155