Compaq 486 Maintenance And Service Manual page 55

grounding are necessary precautions to prevent damage.
precautions to protect equipment from static damage:
o To avoid hand contact, transport products in static safe containers such as
tubes, bags, or boxes.
o Protect all electrostatic parts and assemblies by conductive or approved
containers or packaging.
o Keep electrostatic sensitive parts in their containers until they arrive at
static free stations.
o Place items on a grounded surface before removing them from their
container.
o Always be properly grounded when touching a sensitive component or
assembly.
o Place reusable electrostatic sensitive parts from assemblies in protective
packaging or conductive foam.
Use transporters and conveyors made of antistatic belts and metal roller
bushings. Mechanized equipment used for moving materials must be wired to
ground and proper materials selected to minimize static charging.
grounding is not possible, use an ionizer to dissipate electric charges.
Preventing Damage to Drives
To prevent static damage to diskette drives and fixed disk drives, handle
drives gently and perform the following static guarding techniques:
o Store drives in their original shipping containers.
o Avoid dropping the drive from any height onto any surface.
o Handle drives on surfaces which have at least one inch of shock proof foam.
o Always place drives PCB assembly side down on the foam.
Grounding Methods
Methods for grounding must include either a wrist strap or a foot strap at a
grounded workstation.
grounded system. When standing, use footstraps and a grounded floor mat.
Table 5-2 lists different antistatic materials and their shielding protection
levels.
Table 5-2. Static Shielding Protection Levels
==================================================
Method
--------------------------------------------------
Antistatic plastic
Carbon loaded plastic
Metallized laminate
==================================================
When seated, wear a wrist strap connected to a
Voltages
1,500
7,500
15,000
Use the following
When