Lucent Technologies Lineage
®
2000 200A Ferroresonant Rectifier J85503B-2
Issue 8 January 1999
Replacing Components and Circuit Modules 8 - 9
4. Remove the four transformer mounting nuts, from under
the T1/T2 mounting bracket, that secure the transformer.
5. While supporting the transformer with adequate lifting
equipment (at least 1000 lb), lift the transformer outward.
6. Reinstall the new transformer in the reverse order.
Handling
Circuit Modules
The following guidelines describe an electrostatic discharge
(ESD) prevention method that is consistent with the proper
handling and protection of circuit packs in a central office or
outside plant environment. These guidelines satisfy the
minimum requirements for all three ESD-sensitive
classifications (I, II, III). 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 Warning
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 1 milliohm ±10%. 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.
•
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 heel strap with a
grounded dissipative floor mat.
•
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.
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