Xerox 4540 Service Manual - Page 139

http://sunsolve.sun.com/handbook_pub/Systems/ TABLE 3-7 Sun Fire X4500/X4540 Supported Power Distribution Board Part Number Component Power distribution board to support two A205 PSUs Power distribution board to support three A240 PSUs Part Number #501-7104 #511-1101 ▼ To Replace the Power Distribution Board 1. Power off the server. See Section 2.2, "Powering Off the Server" on page 2-3 including unplugging all cables from the enclosure. 2. Remove the system controller. See "Replacing the System Controller (FRU)" on page 3-68. 3. Remove all power supplies. See "To Remove a Power Supply (CRU)" on page 3-43. 4. From the back of the enclosure, remove the power supply cover. Note - If another system is installed in the rack above your system and blocks access to the power supply cover. To complete some of the following steps, you may need to go to the front of your system and pull it out so it extends all the way out of the rack. Using a No. 1 Phillips screwdriver, remove the two screws on the power supply cover. Pull the cover toward the rear of the chassis and lift. Some extra effort may be required to disengage the eight mushroom-head pins that secure the power supply cover to the chassis (see FIGURE 3-7). Chapter 3 Maintaining the Sun Fire X4500 and X4540 Servers 3-19