HP xw9400 User's Guide download pdf (Page 58)

Service considerations

The following sections discuss service considerations that should be reviewed and practiced before

removing and replacing any system components.

WARNING! When lifting or moving the workstation, do not use the front bezel as a handle

or lifting point. Lifting the workstation from the front bezel or lifting it incorrectly can cause the unit

to fall and harm the user and damage the workstation. To properly and safely lift the workstation,

lift it from the bottom of the unit.

Read cautions, warnings, and safety precautions

For your safety, you must review Service considerations on page 50 before accessing the components

of the workstation. Also, review the Safety and Regulatory Guide that came with your workstation for

more information.

WARNING! Some parts inside the computer will be hot. Power off and unplug the system, and

wait three to five minutes for them to cool before opening the system access panels or touching

internal components.

Electrostatic discharge information

A sudden discharge of static electricity from your finger or other conductor can destroy static-sensitive

devices or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An electronic

device exposed to electrostatic discharge (ESD) might not appear to be affected at all and can work

perfectly throughout a normal cycle. The device can function normally for a while, but it has been

degraded in the internal layers, reducing its life expectancy.

Networks built into many integrated circuits provide some protection, but in many cases, the discharge

contains enough power to alter device parameters or melt silicon junctions.

Generating static

The following table shows that different activities generate different amounts of static electricity. Static

electricity increases as humidity decreases.

Table 4-1 Static electricity

Relative Humidity

Event 5% 4% 1%

Walking across carpet

Walking across vinyl floor

Motions of bench worker

7,500 V

3,000 V

400 V

15,000 V

5,000 V

800 V

35,000 V

12,000 V

6,000 V

Removing bubble pack from PCB

Packing PCBs in foam-lined box

7,000 V

5,000 V

20,000 V

11,000 V

26,500 V

21,000 V

CAUTION 700 volts can degrade a product.

50 Chapter 4 Removal and replacement procedures ENWW

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HP xw9400 User's Guide Page 58

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