Chapter 1 Preparing to Service the System 35
How to Avoid Electrostatic Discharge
Use the following procedure to prevent static damage whenever you are accessing
any of the internal components of the system.
Before You Begin
Complete these tasks:
■ “How to Power Off the System” on page 5
■ “How to Position the System for Service” on page 14
■ “How to Remove the System Cover” on page 30
You must have the following items:
■ Antistatic wrist or foot strap
■ Antistatic mat (or the equivalent)
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 cord from the wall power outlet only when performing
the following procedures:
■ Removing and replacing the power distribution board
■ Removing and replacing the main logic board
■ Removing and replacing the Remote System Control (RSC) card
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.
2. Use an antistatic mat or similar surface.
When performing any installation or service procedure, place static-sensitive parts,
such as boards, cards, and disk drives, on an antistatic surface. The following items
can be used as an antistatic surface:
■ The bag used to wrap a Sun replacement part
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