Oracle Sun Server X4-4 Service Manual page 204

Replace the Power Supply Backplane Board (FRU)
18. 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.
19. 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.
204 Sun Server X4-4 Service Manual • October 2015