Chapter 4 Removal And Replacement; System Safety - Compaq AlphaServer DS20 Service Manual

Chapter 4
Removal and Replacement
This chapter describes removal and replacement procedures for field-replaceable units
(FRUs).
4.1

System Safety

Observe the safety guidelines in this section to prevent personal injury.
CAUTION: Wear an antistatic wrist strap whenever you work on a system.
WARNING: When the system is off and plugged into an AC outlet, auxiliary power is
still supplied to the system. To remove all power, unplug the power supply. Note
though that unplugging the system will turn off LEDs that could identify the problem.
When the system interlocks are disabled and the system is still powered on, voltages
are low in the system, but current is high. Observe the following guidelines to prevent
personal injury.
1. Remove any jewelry that may conduct electricity before working on the system.
2. If you need to access the system card cage, power down the system and wait 2
minutes to allow components in that area to cool.
Removal and Replacement 4-1