Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 155

MAINTENANCE tfJ-8718-19/FE HF RECEIVER
4.2.1 VISUAL INSPECTION
A visual inspection of the receiver should be performed every 1200 hours
of operation or less. The inspection should be performed thoroughly to uncover
existing or potential component malfunctions. At a minimum, the following items
should be checked.
1. Inspect the equipment covers and front panel for condition of
finish and panel markings.
2. Inspect for dents, punctures, or warped areas.
3. Inspect quarter-turn fasteners and receptacles.
4. Inspect the external surfaces for loose or missing screws or
washers.
5. Inspect the receptacles for conditions of pins, contacts, and
mountings.
6. Inspect the internal components for signs of deterioration,
discoloration, or charring. Check for melted insulation and
damaged, cracked, or broken components.
7. Inspect the printed circuit boards for damaged tracks, loose
connections, corrosion, or other signs of deterioration.
8. Inspect the PC connectors, interface connectors, and chassis
wiring for excessive wear, looseness, misalignment, corrosion,
or other signs of deterioration.
4.2.2 CLEANING
Complete removal of dust, grease and other contamination is of prime
importance in maintaining the reliability and useful life of the receiver.
CAUTION
Avoid the use of chemical cleaning agents
containing benzene, toluene, xylene, acetone,
or similar solvents. These chemicals may
damage the plastics used in this receiver.
1. Exterior - Dust the cabinet off with a soft cloth. Dust the
front panel controls with a small soft-bristled paint brush.
Dirt clinging to the cabinet may be removed with a clean,
lint-free cloth dampened with a mild detergent and water
solution. Avoid using abrasive cleaners. They will scratch the
front panel.
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