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.
●
Avoid contact with pins, leads, or circuitry.
●
Place reusable electrostatic-sensitive parts from assemblies in protective packaging or
nonconductive foam.
42
Chapter 3 Component replacement information and guidelines
