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CHPA S
ERIES
6.4 Visual Inspection
At one-month intervals, the CHPA should be inspected visually for physical defects. If the
equipment is subjected to severe environmental conditions, inspections should be performed
more frequently. The daily equipment readings log is a good source for clues that indicate
intermittent or marginal conditions. Any increase in reflected power or unexplained fault
conditions could point to a deteriorating condition that may be found during a thorough visual
inspection. The main circuit breaker must be off while the following general inspection is
performed.
1. With the main circuit breaker off, check that all connector plugs are properly seated in their
mating connectors and have not been damaged. Replace any bad connector plugs and reset
any that are dislodged.
2. Inspect electrical wiring for signs of discolored, broken, or bad insulation. Repair or replace
as needed.
3. Inspect all soldered connections for signs of corrosion, cracking, or dirt. Clean and resolder
as needed.
4. Look for signs of dirt or moisture contamination, which can cause short-circuiting, arcing,
corrosion, or overheating. Clean contaminated areas with a lint-free cloth, a small vacuum
cleaner, or a compressed-air blower at low pressure. Beware of electrostatic discharge (ESD)
when using compressed air. See "Protecting Parts from Electrostatic Discharge", later in this
chapter.
5. Inspect all waveguides for discoloration, cracks, loose connectors, and improper sealing.
Tighten or replace waveguides as required.
6. With AC power disconnected at its source, retighten the main power line terminal (TB1)
with an insulated screwdriver. The gradual failure of this terminal is indicated by a decrease
of contact pressure caused by thermal expansion and contraction.
7. Check for other defects. These include, but are not limited to, wear, breakage, deterioration,
fungus, excess moisture, and mounting integrity.
6.4.1
Inspecting and Cleaning Air Filters
The air filter at the rear intake of the amplifier should be checked bimonthly and cleaned or
replaced as follows:
1. Inspect the filters for dirt. If necessary, clean with hot water and mild detergent. Dry
thoroughly.
2. Replace the filter.
6-4
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