Basic Maintenance
2-1
2
Basic Maintenance
2
Introduction
This section of the manual describes preventive maintenance, safe handling of
CMOS devices, and repair procedures and techniques. Each of these topics
provides information vital to the successful operation and maintenance of your
radio.
Preventive
Maintenance
The radios do not require a scheduled preventive maintenance program; however,
periodic visual inspection and cleaning is recommended.
Inspection
Check that the external surfaces of the radios are clean, and that all external
controls and switches are functional. A detailed inspection of the interior
electronic circuitry is not needed or desired.
Cleaning
The following procedures describe the recommended cleaning agents and the
methods to be used when cleaning the external and internal surfaces of the radio.
External surfaces include the front cover, housing and assembly. These surfaces
should be cleaned whenever a visual inspection reveals the presence of smudges,
grease, and/or grime. Internal surfaces should be cleaned only when the radio is
disassembled for servicing or repair.
The only recommended agent for cleaning the external radio surfaces is a
0.5%solution of mild dishwashing detergent in water. the only factory
recommended liquid for cleaning the printed circuits boards and their components
is isopropyl alcohol (70% by volume).
Plastic Surfaces
The detergent solution should be applied sparingly with a stiff non-metallic, short-
bristled brush to work all loose dirt away from the radio. A soft, absorbent, lint-
free cloth or tissue should be used to remove the solution and dry the radio. Make
sure that no water remains entrapped near the connectors, cracks, or crevices.
Circuit Boards and
Components
Isopropyl alcohol may be applied with a stiff, non-metallic, short-bristled brush to
dislodge embedded or caked material located in hard-to-reach areas. The brush
stroke should direct the dislodged material out and away from the inside of the
radio.
CAUTION
The effects of certain chemical and their vapors can have
harmful results on certain plastics. Aerosol sprays, tuner
cleaners, and other chemicals should be avoided.
CAUTION
Alcohol is a high-wetting liquid and can carry
contamination into unwanted places if an excessive
quantity is used.
!
!
