Dell PowerEdge R300 - Manual (Page 121)

Installing System Components
121
12 Disconnect the two power cables from the 12V and PWR_CONN
connectors on the system board. See Figure 6-1.
CAUTION:
Before removing the system board tray from the chassis, ensure that
all system board cables are disconnected from their respective cable connectors.
13 Pull up on the plunger that secures the system board tray to the chassis
floor. See Figure 3-24.
14 Using the tab on the system board tray, slide the system board forward
(toward the front of the system) and lift the assembly up and out of the
chassis. See Figure 3-24.
15 Lay the system board tray down on a smooth, nonconductive work surface.
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