Oracle X5-4 Service Manual page 233

20. Insert the replacement power supply backplane board into the server. The tabs
on the power board must slide onto the flanges on the power supply cage.
21. Connect the two power supply cables to the connectors on the back side of the
power supply backplane board.
22. Lower the motherboard into the server and guide the light pipe extension piece
for the Locator indicator at the back of the motherboard into its hole on the
server back wall.
This should also align the bus bar holes on the motherboard to the power supply backplane bus
bar connector holes.
Replace the Power Supply Backplane Board (FRU)
Servicing FRU Components 233