Acer Altos R710 - Manual (Page 75)

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5 Push back on the blue release lever at the end of one of the riser
boards. While holding the lever back, push firmly on the other
edgo of the board to disengage the board from the riser.
Installing the PCI Riser Assembly
Use the following instructions to install the PCI riser assembly from the
chassis.
1
Install any cables into add in cards.
2 Set the riser assembly straight down, matching the hooks in the
back of the riser assembly to the notches in the rear of the chassis.
3 Press firmly to push the riser into the slots on the server board.
4 Install Processor Air Duct.
5 Install the chassis cover.