Lucent Technologies Lineage
®
2000 25A Ferroresonant Rectifier J85502A-1
8 - 2 Spare Parts and Replacement Procedures
Issue 4 May 1998
Handling
Circuit Modules
The following guidelines describe how to prevent electrostatic
discharge (ESD) and properly handle and protect circuit packs
(modules) in a central office or outside plant environment. These
guidelines satisfy the minimum requirements for all three
ESD-sensitive classifications (I, II, III) and, therefore, all circuit
packs in these classes are handled in the same manner, regardless
of sensitivity. Factory packaging provides shielding in the rare
instances when it is necessary.
Electrostatic
Discharge
•
Assume all circuit packs containing electronic (solid-state)
components can be damaged by ESD.
•
When handling circuit packs (storing, inserting, removing,
etc.) or when working on the backplane, always use the
appropriate grounding procedure: either a wrist strap
connected to ground or, when standing, a heelstrap with a
grounded dissipative floormat.
•
A grounded person must never hand an unprotected circuit
pack to an ungrounded person. A static discharge from the
ungrounded person through the circuit pack to the grounded
person could cause an electrostatic discharge failure. All
persons and equipment at a work location must be at the
same common ground potential to be static safe.
•
Handle all circuit packs by the faceplate or latch and by the
top and bottom outermost edges. Never touch the
components, conductors, or connector pins.
•
Do not rub or wipe circuit packs to clean them unless you
and the circuit pack are at the same ground potential.
Caution
Grounded antistatic wrist straps must be worn for all circuit
pack handling. The alligator clip connector of the wrist strap
must be connected to a bare metal frame ground. The wrist
strap must contact the skin and is not to be worn over clothing.
At least once every week of use, verify that the resistance
between the wrist strap and its connector plug is 1M
Ω ±
10
percent. If a static-sensitive pack has already been found
faulty, do not ignore requirements for handling static-sensitive
packs. Continued mishandling may create other, more serious,
problems with the pack.
