Lucent Technologies Lineage
®
2000 400A, 60Hz Ferroresonant Rectifier J85503C-3
8 - 12 Spare Parts and Replacement Procedures
Issue 10 July 2000
on wire. Always remember to save hardware, thermal pads, and other
items in a convenient place for reassembly.
• 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.
• Most component removals are straightforward and obvious.
Therefore, these procedures can be used as a guide by qualified
service personnel, rather than as step-by-step procedures. For
example, you may prefer to remove a part not called for in order to
make more room for access to a component being replaced.
Torquing
Requirements
Tables 8-D and 8-E provide the reassembly torquing requirements for
the electrical and mechanical connections in the rectifier. Torque values
are given in inch-pounds or foot-pounds and Newton-meters. Use these
values unless otherwise directed in the procedures.
Notes:
• Slotted machine screws should be the pan-head type.
• Slotted machine and hex cap screws should be SAE Grade 2 steel or
equivalent.
• Socket cap screws should have 100,000 psi minimum tensile
strength.
• Locking means is only required for connections subject to vibration.
Belleville-type washers or jam nuts are preferred.
• Ferrous screws and washers should have a corrosion protective
finish.
• For tapped copper bars less than 1/4-inch thick, use slotted No. 8,
No. 10, or 1/4-inch machine screws to minimize applicable torque.
When larger size screws are required, provide captive-type steel nuts
or reduce torque.
• Torque recommendations are also suitable for all non-ferrous
fasteners, except aluminum.
• Where the application permits, use hex cap screws.
