3-20 Sun Ultra 45 and Ultra 25 Workstations Service and Diagnostics Manual • May 2006
3.6 Replacing the Motherboard
This section describes removal and installation of the motherboard.
Caution – This procedure is intended for Sun authorized service providers only.
3.6.1 Removing the Motherboard
The motherboard, CPU, and NVRAM are a single replaceable unit.
1. Power off the system and attach an antistatic wrist strap. Disconnect all external
cables; open and position the chassis, and remove the access panel.
Refer to “Powering Off the Workstation” on page 2-4.
2. If necessary, remove the PCI cards and DIMMs (
FIGURE 3-11).
Refer to:
■ “Removing the DIMMs” on page 3-7
■ “Removing a PCI Card” on page 3-14
Set these components onto an antistatic mat (
FIGURE 3-11).
3. Remove the fan tray.
4. (Optional) If you want to use the same Ethernet address and system ID for the
new motherboard, remove the NVRAM and place it on an antistatic mat.
Refer to “Removing the NVRAM” on page 3-11.
Note – If you have software that is licensed to the HostID or Ethernet address, you
should install the old NVRAM on the new motherboard.
5. Remove all cables from the cable clips (
FIGURE 3-11).
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