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120 Sun Fire V490 Server Administration Guide • August 2004
How to Avoid Electrostatic Discharge
Qualified service technicians should use the following procedure to prevent static
damage whenever they access any of the internal components of the system.
Caution – Do not attempt to access any internal components unless you are a
qualified service technician. Detailed service instructions can be found in the Sun
Fire V490 Server Parts Installation and Removal Guide, which is included on the Sun
Fire V490 Documentation CD.
Before You Begin
Complete this task:
■ “How to Power Off the System” on page 125
You must have the following items:
■ Antistatic wrist or foot strap
■ Antistatic mat
What to Do
Caution – Printed circuit boards and hard disk drives contain electronic
components that are extremely sensitive to static electricity. Ordinary amounts of
static from your clothes or the work environment can destroy components.
Do not touch the components or any metal parts without taking proper antistatic
precautions.
1. Disconnect the AC power cords from the wall power outlet only when performing
the following procedures:
■ Removing and installing the power distribution board
■ Removing and installing the centerplane
■ Removing and installing the PCI riser board
■ Removing and installing the system controller (SC) card
■ Removing and installing the system control switch/power button cable
The AC power cord provides a discharge path for static electricity, so it should
remain plugged in except when you are servicing the parts noted above.