IBM xSeries 205 Type 8480 Hardware Maintenance Manual And Troubleshooting Manual page 86

8. Remove the extender card screws.
9. Disconnect the extender card connector from the system board edge connector:
then, tilt the extender card and remove it from the server.
To install an extender card reverse this procedure.
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IBM xSeries 205 Type 8480: Hardware Maintenance Manual and Troubleshooting Guide