HP Z220 F1J90UAABA, Z420 D3J34UT#ABA manual Service considerations, Tools and software requirements

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	7,500V	15,000V	35,000V
	Walking across vinyl floor	3,000V	5,000V	12,000V
	Motions of bench worker	400V	800V	6,000V
	Removing bubble pack from PCB	7,000V	20,000V	26,500V
	Packing PCBs in foam-lined box	5,000V	11,000V	21,000V
Preventing ESD	Many electronic components are sensitive to ESD. Circuitry design and structure determine the
equipment	degree of sensitivity. The following packaging and grounding precautions are necessary to prevent
damage	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.

●Avoid contact with pins, leads, or circuitry.

●Place reusable electrostatic-sensitive parts from assemblies in protective packaging or nonconductive foam.

Service considerations 79