Removing The Power Supply Backplane - Sun Microsystems Sun Fire X4450 Service Manual

Note – FRU: This field-replaceable unit should be replaced only by qualified service
technicians. Contact your Sun Service representative for assistance.
Caution – The system supplies power to the power supply backplane even when
the server is powered off. To avoid personal injury or damage to the server, you must
disconnect power cords before servicing the power supply backplane.
5.6.1

Removing the Power Supply Backplane

1. Remove the motherboard assembly.
See
2. Remove all power supplies.
Grasp the power supply handle and press the release latch.
3. Remove the power distribution board.
See
4. Unscrew the 4 screws to remove the L shaped busbars from the power supply
backplane to the PDB.
5. Remove the No. 2 Phillips screw securing the power supply backplane to the
power supply bay. (
6. Lift the power supply backplane up and off its mushroom standoffs, and out of
the system. [2]
7. Place the power supply backplane on an antistatic mat.
Section 4.8.1, "Removing the Motherboard Assembly" on page
Section 5.5.1, "Removing the Power Distribution Board" on page
FIGURE 5-10
Chapter 5
[1])
Servicing Infrastructure Boards and Components
4-30.
5-12.
5-15