Service Considerations; Cautions, Warnings And Safety Precautions; Esd Information; Generating Static - HP Z400 Maintenance And Service Manual

NOTE:
HP accessories are for use in HP Workstation products. They have been extensively tested for
reliability and are manufactured to high quality standards.

Service considerations

Review the following sections, which describe service considerations, before removing and replacing
system components.
WARNING!
workstation. Lifting the workstation from the front bezel, or lifting it incorrectly, could cause the
workstation to fall, causing possible injury to you and damage to the workstation. To properly and
safely lift the workstation, use the handles. If the workstation is not equipped with handles, lift from the
bottom of the workstation.

Cautions, warnings and safety precautions

For safety, review the cautions, warnings, and safety precautions before accessing the workstation
components. Also, review the Safety and Regulatory Guide that came with the workstation for more
information.

ESD information

Generating static

The following table shows that different activities generate different amounts of static electricity. Static
electricity increases as humidity decreases.
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing bubble pack from
PCB
Packing PCBs in foam-lined box
CAUTION:
66 Chapter 5 Replacing components
Do not use the front bezel as a handle or lifting point when lifting or moving the
Event
7,500V
3,000V
400V
7,000V
5,000V
Static electricity in the amount of 700 volts might degrade a product.
Relative humidity
55% 40%
15,000V 35,000V
5,000V 12,000V
800V 6,000V
20,000V 26,500V
11,000V 21,000V
10%
ENWW