Dell PowerEdge E05S Owner's Manual page 136

4 Remove the cooling fan assembly. See "Removing the Cooling Fan
Assembly" on page 102.
5 If applicable, remove the cables on the power distribution board.
6 Separate the system board and the I/O board to disengage the
interconnect between the power distribution board and the I/O board:
Slightly lift the tab on the high-speed connector to free the release
a
levers. See Figure 3-30.
Push the release levers at an angle of 90 degrees away from the
b
connector to separate the system board and the power distribution
board from the I/O board. See Figure 3-30.
7 Press the release tab in the direction of the arrow and slide the board
upwards. See Figure 3-28.
8 Pull the power distribution board up until the securing slots on the board
are free from the tabs on the chassis. See Figure 3-28.
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Installing System Components