Installing The Motherboard Assembly - Sun Microsystems Sun Fire X4450 Service Manual

4.8.2

Installing the Motherboard Assembly

Caution – This procedure requires that you handle components that are sensitive to
static discharge. Static discharges can cause the component failures. To avoid
damage, ensure that you follow antistatic practices as described in
"Performing Electrostatic Discharge and Antistatic Prevention Measures" on
page
1. Power off the server.
See
2. Attach an antistatic wrist strap.
See
Measures" on page
3. If you are replacing the motherboard only, replace the CPUs, as required.
Apply thermal grease. Follow the applicable grease procedure included with the
grease.
4. Install the CPU heat sinks on the motherboard assembly.
5. Place the motherboard tray in to the chassis. (
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6. Install the 4 screws that secure the motherboard to the bus bar.
Use a No. 2 Phillips screwdriver.
7. Fasten the captive screw at the front of the motherboard.
8. Carefully connect the power distribution board ribbon cable to the
motherboard.
Make sure it is seated properly.
9. Connect the two drive data cables.
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4-32 Sun Fire X4450 Server Service Manual • November 2009
2-9.
Section 2.4, "Powering Off the Server" on page
Section 2.7, "Performing Electrostatic Discharge and Antistatic Prevention
2-9.
Move the motherboard tray carefully.
Gently slide the motherboard to the front and carefully set it down.
The blind mushroom standoffs must engage the keyhole slots in the tray - align
the tray before moving the tray forward to latch.
Be careful when routing the drive cables so they are not pinched and are
underneath the ribs on the support.
Ensure that the two cables are placed behind the plastic shield between the
CPU and the power supply housing.
Section 2.7,
2-3.
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FIGURE 4-18