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Chapter 4 Maintaining the Sun Fire V40z Server 4-41
4.5.9 Memory Voltage-Regulator Modules
Caution – The Registered DDR 400 memory DIMMS can only be used in the
updated release (chassis PN 380-1206) of the Sun Fire V40z server.
If you are installing the new Registered DDR 400 memory DIMMs in your server,
you must also install the new 2.6V voltage-regulator module (VRM) (PN 370-7747).
The Sun Fire V40z server contains memory voltage-regulator modules (VRMs) in
four locations. Two memory VRMs are on the motherboard and two are on the
optional CPU card. Use the correct procedure in this section:
■ “Replacing a Memory VRM on the Motherboard” on page 4-41
■ “Replacing a Memory VRM on the CPU Card” on page 4-42
4.5.9.1 Replacing a Memory 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.
6. Identify the memory VRM that must be replaced.
The memory VRM is in the outer slot, furthest from the CPU.
7. Remove a memory VRM by pressing down on the ejector bars at both ends of the
socket (see
FIGURE 4-28).