Chapter 2 Basic Maintenance
This chapter describes inspection, cleaning, and handling precautions for the control heads. Each of
these topics provides information vital to the successful operation and maintenance of your radio.
2.1 Inspection
Check that the external surfaces of the control head are clean, and that all external controls and
switches are functional. A detailed inspection of the interior electronic circuitry is not needed.
2.2 Cleaning
The following procedures describe the recommended cleaning agents and the methods to be used
when cleaning the external and internal surfaces of the control head. These surfaces should be
cleaned whenever a periodic visual inspection reveals the presence of smudges, grease, and/or
grime. Internal surfaces should be cleaned only when the control head is disassembled for servicing
or repair.
The only recommended agent for cleaning the external control head surfaces is a 0.5% solution of a
mild dishwashing detergent in water. The only factory recommended liquid for cleaning the printed
circuit boards and their components is isopropyl alcohol (70% by volume).
2.2.1 Cleaning External Plastic Surfaces
The detergent-water solution should be applied sparingly with a stiff, non-metallic, short-bristled
brush to work all loose dirt away from the control head. A soft, absorbent, lint-free cloth or tissue
should be used to remove the solution and dry the control head. Make sure that no water remains
entrapped near the connectors, cracks, or crevices.
2.2.2 Cleaning Internal Circuit Boards and Components
Isopropyl alcohol may be applied with a stiff, non-metallic, short-bristled brush to dislodge embedded
or caked materials located in hard-to-reach areas.
Alcohol is a high-wetting liquid and can carry contamination into unwanted places if an excessive
quantity is used. Make sure that controls or tunable components are not soaked with the liquid. Do
not use high-pressure air to hasten the drying process, since this could cause the liquid to puddle
and collect in unwanted places.
Upon completion of the cleaning process, use a soft, absorbent, lint-free cloth to dry the area.
NOTE: Always use a fresh supply of alcohol and a clean container to prevent contamination by
dissolved material (from previous usage).
The effects of certain chemicals and their vapors can have
harmful results on certain plastics. Aerosol sprays, tuner
cleaners, and other chemicals should be avoided.
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C a u t i o n
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