Antenna
•Check all electrical components for dirt, chips, cracks, breaks, discoloration or other
signs of deterioration and damage. A discolored, blistered or burnt condition is evidence of overload. Measure actual value of suspect electrical components and compare against specified value where applicable.
•Check transformer for an excessive wax deposit on the surface, discoloration or a pungent odor indicative of burning varnish denoting overheating or a total breakdown.
•Check all terminal blocks for broken or missing terminals and stripped threads. Check tightness of lead attaching hardware.
Caution
Make sure electrical power has been disconnected.
•Check the motor starters and circuit breakers for free operation. Check tightness of all wire connections.
•Visually inspect printed circuit board for signs of debris that might short out compo-
nents. Verify that all LED indicators are functioning correctly. Check the terminal block connectors for tightness of lead attracting hardware and signs of scorching or burning.
•Check for security of all hardware and stripped or otherwise damaged threads. Check metallic parts for corrosion, dents, distortion and other deformation.
•Check for evidence of water inside the enclosure. If any water is in evidence, check
that all seals are intact and if not, use a coating of
•Check or change vapor corrosion inhibitor unit.
Inspection of the antenna conforms generally to standard visual inspection procedures performed on electromechanical equipment. In addition to these procedures, perform the following checks and visual inspections for the specific conditions noted:
•Inspect all wiring and cables, particularly the network to enclosure and enclosure to
mount interfaces, for discoloration and burned insulation, moisture entry, corrosion, dirt, breaks, security of connection, and other signs of deterioration. Examine connections for dirt, corrosion and mechanical defects. Check for loose or broken lacing and cut, abrad- ed, frayed, brittle and cracked insulation.
•Examine connectors for corrosion, broken inserts and stripped threads. Check con-
nector shells for distortion and dents, and contact pins for bends, misalignment or other deformities. Check connector inserts for cracks, carbon tracking, burns or charring indi- cating
75 | Preventive Maintenance |
