Compaq PRESARIO 5000 SERIES Maintenance And Service Manual page 21

Storage Devices
(CD, CD-RW and/or
DVD Drive, Hard Drive,
Disk Drive)
Power Supply
Assembly
Front I/O Board
System Board
Components
(RTC Battery,
Microprocessor/Heatsink
Assembly)
Preventing Electrostatic Damage to Equipment
Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The
following proper packaging and grounding precautions are necessary to prevent damage:
Protect all electrostatic parts and assemblies with conductive or approved containers or packaging.
1.
Keep electrostatic sensitive parts in their containers until they arrive at static-free stations.
2.
Place items on a grounded surface before removing them from their container.
3.
Always be properly grounded when touching a sensitive component or assembly.
4.
Place reusable electrostatic-sensitive parts from assemblies in protective packaging or conductive foam.
5.
Use transporters and conveyors made of antistatic belts and metal roller bushings. Mechanized equipment used for
moving materials must be wired to ground the proper materials selected to avoid static charging. When grounding is not
possible, use an ionizer to dissipate electric charges.
Preventing Damage to Drives
To prevent static damage to hard drives, use the following precautions.
Handle drives gently, using static-guarding techniques.
1.
Store drives in the original shipping containers.
2.
Avoid dropping drives from any height onto any surface.
3.
Handle drives on surfaces that have at least one inch of shock-proof foam.
4.
Always place drives PCB-assembly-side down on the foam.
5.
Grounding Methods
The method for grounding must include a wrist strap or a foot strap at a grounded workstation. When seated, wear a
Removing DIPS from vinyl
trays
Removing DIPS from
Styrofoam
Removing bubble pack
from PCBs
Packing PCBs in
foam-lined box
NOTE: 700 volts can degrade a product.
11,500 V 4,000 V
14,500 V 5,000 V
26,000 V 20,000 V
21,000 V 11,000 V
2,000 V
3,500 V
7,000 V
5,000 V