HP Z840 Maintenance and Service Guide - Page 56

Service considerations, Tools and software requirements, Electrostatic discharge (ESD) information

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CAUTION: Static electricity can damage the electronic components of the computer. To prevent damage to the computer, observe the following Electrostatic Discharge (ESD) precautions while servicing the computer: - Discharge static electricity by briefly touching a grounded metal object before you begin. - Work on a static-free mat. - Wear a static strap to ensure that any accumulated electrostatic charge is discharged from your body to the ground. - Create a common ground for the equipment you are working on by connecting the static-free mat, static strap, and peripheral units to that piece of equipment. NOTE: HP accessories are for use in HP products. They have been extensively tested for reliability and are manufactured to high quality standards. Service considerations Tools and software requirements The tools necessary for computer component removal and installation are: ● Torx T-15 driver ● Flat blade and cross-tip screwdrivers ● Diagnostics software Electrostatic discharge (ESD) information Generating static Preventing ESD equipment damage Different activities generate different amounts of static electricity through electrostatic discharge (ESD). Static electricity increases as humidity decreases. CAUTION: Static electricity in the amount of 700 volts might degrade a product. Event Relative humidity 55% 40% 10% Walking across carpet 7,500V 15,000V 35,000V Walking across vinyl floor Motions of bench worker 3,000V 400V 5,000V 800V 12,000V 6,000V Removing bubble pack from PCB Packing PCBs in foam-lined box 7,000V 5,000V 20,000V 11,000V 26,500V 21,000V Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following packaging and grounding precautions are necessary to prevent damage to electric components and accessories: ● Transport products in static-safe containers such as tubes, bags, or boxes, to avoid hand contact. ● Protect electrostatic parts and assemblies with nonconductive or approved containers or packaging. ● Keep electrostatic-sensitive parts in their containers until they arrive at static-free stations. ● Place items on a grounded surface before removing them from containers. ● When handling or touching a sensitive component or assembly, ground yourself by touching the chassis. 46 Chapter 3 Component replacement information and guidelines

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CAUTION:
Static electricity can damage the electronic components of the computer. To prevent damage to
the computer, observe the following Electrostatic Discharge (ESD) precautions while servicing the computer:
— Discharge static electricity by
briefly
touching a grounded metal object before you begin.
— Work on a static-free mat.
— Wear a static strap to ensure that any accumulated electrostatic charge is discharged from your body to
the ground.
— Create a common ground for the equipment you are working on by connecting the static-free mat, static
strap, and peripheral units to that piece of equipment.
NOTE:
HP accessories are for use in HP products. They have been extensively tested for reliability and are
manufactured to high quality standards.
Service considerations
Tools and software requirements
The tools necessary for computer component removal and installation are:
●
Torx T-15 driver
●
Flat blade and cross-tip screwdrivers
●
Diagnostics software
Electrostatic discharge (ESD) information
Generating static
Different
activities generate
different
amounts of static electricity through electrostatic discharge (ESD).
Static electricity increases as humidity decreases.
CAUTION:
Static electricity in the amount of 700 volts might degrade a product.
Event
Relative humidity
55%
40%
10%
Walking across carpet
Walking across vinyl
floor
Motions of bench worker
7,500V
3,000V
400V
15,000V
5,000V
800V
35,000V
12,000V
6,000V
Removing bubble pack from PCB
Packing PCBs in foam-lined box
7,000V
5,000V
20,000V
11,000V
26,500V
21,000V
Preventing ESD
equipment damage
Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of
sensitivity. The following packaging and grounding precautions are necessary to prevent damage to
electric components and accessories:
●
Transport products in static-safe containers such as tubes, bags, or boxes, to avoid hand contact.
●
Protect electrostatic parts and assemblies with nonconductive or approved containers or
packaging.
●
Keep electrostatic-sensitive parts in their containers until they arrive at static-free stations.
●
Place items on a grounded surface before removing them from containers.
●
When handling or touching a sensitive component or assembly, ground yourself by touching the
chassis.
46
Chapter 3
Component replacement information and guidelines