HP C9K75UT User Manual download pdf (Page 36)

Equipment guidelines

Grounding equipment must include either a wrist strap or a foot strap at a grounded workstation.

●

When seated, wear a wrist strap connected to a grounded system. Wrist straps are flexible

straps with a minimum of one megohm ±10% resistance in the ground cords. To provide proper

ground, wear a strap snugly against the skin at all times. On grounded mats with banana-plug

connectors, use alligator clips to connect a wrist strap.

●

When standing, use foot straps and a grounded floor mat. Foot straps (heel, toe, or boot straps)

can be used at standing workstations and are compatible with most types of shoes or boots. On

conductive floors or dissipative floor mats, use foot straps on both feet with a minimum of one

megohm resistance between the operator and ground. To be effective, the conductive must be

worn in contact with the skin.

The following grounding equipment is recommended to prevent electrostatic damage:

●

Antistatic tape

●

Antistatic smocks, aprons, and sleeve protectors

● Conductive bins and other assembly or soldering aids

●

Nonconductive foam

●

Conductive tabletop workstations with ground cords of one megohm resistance

● Static-dissipative tables or floor mats with hard ties to the ground

● Field service kits

●

Static awareness labels

●

Material-handling packages

● Nonconductive plastic bags, tubes, or boxes

●

Metal tote boxes

●

Electrostatic voltage levels and protective materials

The following table lists the shielding protection provided by antistatic bags and floor mats.

Material Use Voltage protection level

Antistatic plastics Bags 1,500 V

Carbon-loaded plastic Floor mats 7,500 V

Metallized laminate Floor mats 5,000 V

Component replacement procedures

This chapter provides removal and replacement procedures.

There are as many as 77 screws that must be removed, replaced, or loosened when servicing

the computer. Make special note of each screw size and location during removal and replacement.

28 Chapter 4 Removal and replacement procedures

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HP C9K75UT User Manual Page 36

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