IBM Power Systems 9223-22S, Manual

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e) Grasp the system backplane by positions (A) and (B) on the front and middle metal bulkheads and
lift up until the pins disengage from the bottom of the chassis. As you lift the backplane, be careful
not to hit the backplane on the tabs (C) on the power supply cage. See the following figure.
Figure 60. Grasping the system backplane and disengaging the pins
f) Tilt the system backplane so that the front end is high and the back end is low as you continue to
lift the system backplane out of the chassis. When the system backplane catches on the tabs (A)
Removing and replacing the system backplane in the 5105-22E, 9008-22L, 9009-22A, 9009-22G, 9223-22H,
or 9223-22S 61