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4-44 Sun Fire V20z and Sun Fire V40z Servers—User Guide • March 2005
4.5.10 CPU Voltage-Regulator Modules
The Sun Fire V40z server contains CPU voltage-regulator modules (VRMs) in four
locations. Two CPU VRMs are on the motherboard and two are on the optional CPU
card. Use the correct procedure in this section:
■ “Replacing a CPU VRM on the Motherboard” on page 4-44
■ “Replacing a CPU VRM on the CPU Card” on page 4-47
4.5.10.1 Before You Start
This procedure covers both the original release of the Sun Fire V40z server (chassis
part number [PN] 380-1010) and the updated release of the server (chassis PN
380-1206).
■ The updated release of the server implements wire clips to secure the CPU VRMs
in place, on both the motherboard and the auxiliary CPU card (see
FIGURE 4-29).
The original release of the server does not have these clips.
■ The CPU VRM for the updated release has more pins than the CPU VRM for the
original release. These VRMs are not interchangeable.
■ The CPU VRM for the original release of the Sun Fire V40z server can also be
used in the original release (chassis PN 380-0979) and first updated release
(chassis PN 380-1168) of the Sun Fire V20z server.
■ The CPU VRM for the updated release of the Sun Fire V40z server can also be
used in the second updated release of the Sun Fire V20z server (chassis PN
380-1194).
4.5.10.2 Replacing a CPU VRM on the Motherboard
1. Power off the server, including any attached peripherals, and disconnect the
server from the electrical outlet. If your server includes two power supplies,
ensure that both power cords are disconnected from the electrical outlet.
Refer to “Powering Off the Server and Removing the Cover” on page 4-2.
2. Remove the main air baffle (see
FIGURE 4-20).
Lift the rear edge of the baffle, then move it toward the rear of the server to
disengage the hooks on the front edge of the baffle.
3. Remove the rear fan-cage assembly. Squeeze the retainer clips on each end of the
fan cage inward (see
FIGURE 4-25).
4. Pull straight up on the fan-cage assembly to disengage it from the motherboard
connector.
5. Lift the assembly up and out of the server.