Lucent Technologies Lineage
®
2000 125A Ferroresonant Rectifier J85502C-1
8 - 10 Spare Parts and Replacement Procedures
Issue 8 July 1999
battery bus potentials and current capabilities. The disconnected
charge battery and charge ground connectors must be taped
adequately to prevent them from contacting each other or any
other metal surface. Alternatively, the dc battery cables from the
rectifier can be disconnected at the plant charge battery and
charge ground buses.
Always make note of the lead connection points (termination
points) before unsoldering or disconnecting them to insure
trouble-free reinstallation. This includes potentiometer leads, or
the solderless, quick-disconnect type connections used on circuit
boards, relays, inductors, transformers, and wire bundles.
Always disconnect quick-disconnect connections by pulling
straight apart with pliers to avoid bending or breaking the tabs.
Do not pull on wire. Always remember to save hardware,
thermal pads, and other items necessary for reassembly.
Heat-generating semiconductor components, such as diodes and
thyristors (triacs), employ heat-conductive devices for heat
sinking such as thermal grease or thermal pads. The thermal
grease used should be KS-21343, L1. Diode thermal pads used
in new rectifiers are comcode 406506907. Triac Q1 uses DP102,
comcode 403208242.
DC capacitors can be examined to see if they have “blown” (i.e.
vented) due to voltage breakdown failure. A small hole in the
capacitor top, called a “blowhole,” is plugged in a new or good
capacitor, but is empty (blown out) in a failed unit. Some
capacitor blowholes cannot be viewed directly until removed, or
almost removed, from the rectifier. A dental-type mirror aids in
viewing these capacitors' blowholes before disassembly. Lucent
Technologies recommends that all dc capacitors in a rectifier be
replaced whenever any one of them blows.
Procedures for testing and replacing individual rectifier diodes
are provided in “Rectifier Diode Test and/or Replacement” in
this section. Also provided in “Heat Shrink Removal” in this
section is the procedure for taking apart bolted and insulated
connections, such as those used on large transformer leads.
