5-12 Sun Fire X4450 Server Service Manual • November 2009
3. Install the drives backplane.
See Section 5.3.2, “Installing the Drives Backplane” on page 5-9.
4. Install the drives cage.
See Section 5.2.2, “Installing the Drives Cage” on page 5-7.
5.5 Servicing the Power Distribution Board
(PDB)
It is easier to service the power distribution board (PDB) with the bus bar assembly
attached. If you are replacing a faulty PDB, you must remove the bus bar assembly
from the old board and attach it to the new PDB.
You must remove the power distribution board to access the paddle card.
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 distribution board 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 distribution board.
5.5.1 Removing the Power Distribution Board
The following tools are needed for this procedure:
■ No, 2 Phillips screwdriver
1. Remove the motherboard assembly.
See Section 4.8.1, “Removing the Motherboard Assembly” on page 4-30.
2. Remove all power supplies.
a. Grasp the power supply handle and press the release latch.
b. Slide the power supply out of the system.
3. Disconnect the top cover interlock cable from the power distribution board.
(
FIGURE 5-8 [1])
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