IBM 7947E3U User Manual page 112

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System x3650 M2 Types 4199 and 7947: Installation and User's Guide
c. Install the controller retention bracket from step b by aligning the
retention bracket controller slot and then placing the bracket tabs in the
holes on the chassis and slide the bracket to left until it clicks into place.
d. Install the controller retention bracket from step a by sliding the bracket
inward 1 and pressing down the release tab into place 2 .
2. Place the front end of the SAS controller in the front retention bracket and
align the SAS riser card with the SAS riser-card connector on the system
board.
3. Press down on the SAS riser card and the rear edge of the SAS controller
until the SAS riser card is firmly seated and the SAS controller card retention
latch clicks into place.