Service manual

Chapter 4 Preparing for Servicing 4-5
4.1.4 Performing Electrostatic Discharge (ESD)
Prevention Measures
1. Prepare an antistatic surface to set parts on during removal and installation.
Place ESD-sensitive components, such as the printed circuit boards, on an antistatic
mat. The following items can be used as an antistatic mat:
■ Antistatic bag used to wrap a replacement part
■ ESD mat, part number 250-1088
■ Disposable ESD mat (shipped with some replacement parts or optional system
components)
2. Use an antistatic wrist strap.
4.1.5 Removing the Top Cover
Access to all field-replaceable units (FRUs) requires the removal of the top cover.
Note – Never run the system with the top cover removed. The top cover must be in
place for proper air flow. The cover interlock switch immediately shuts the system
down when the cover is removed.
Caution – The system supplies 3.3 Vdc standby power to the circuit boards even
when the system is powered off if the AC power cord is plugged in.
1. Press the cover release button (
FIGURE 4-3).
2. While pressing the release button, grasp the rear of the cover and slide the cover
toward the rear of the server about one half inch (1.2 cm).
3. Lift the cover off the chassis.