To remove the adapter retainer, do the following:
1. Power-off the server, if it is on.
2. Unplug the server.
3. Remove the side cover (see "Removing the side cover" on page 57).
4. Remove all adapter cards (see "Installing an adapter" on page 62).
5. Rotate the adapter retainer to the open position.
6. Grasp the adapter retainer and gently slide the top and bottom tabs out of the
notches.
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Hardware Maintenance Manual: xSeries 220 Type 8645