3-1
Chapter 3
Maintenance
3.1 Introduction
This chapter pr ov ide s de tails about the following:
lPreventive maintenance (in spection and cleaning)
lSafe handling of CMOS and LDMOS devices
lDisassembly and reassembly of the radio
lInstallation of Optional Retrofit Kit
lInstallation of Option Boards
3.2 Preventive Maintenance
The radios do not require a scheduled preventive maintenance program; however, periodic visual
inspection and cleaning is recom mended.
3.2.1 Inspection
Check that the external surfa ces of the rad io are clean, and that all external controls and switches are
functional. It is not recommended to inspect the interior electronic circuitry.
3.2.2 Cleaning Procedures
The following procedures describe the recommended cleaning agents and the metho ds to be used
when cleaning the external and internal surfaces of the radio. External surfaces include the front
cover, housing assembly, and battery case. These surfaces should be cleaned wheneve r a periodic
visual inspection reveals the presence of smudges, grease, and/or grime.
The only recommended agent for cleaning the external radio 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).
Cleaning Exte rn a l Plas ti c Su rf a ce
Apply the 0.5% detergent-water solution sparingly with a stiff, non-metallic, short-bristled brush to
work all loose dirt away from the radio. Use a soft, absorbent, lintless cloth or tissue to remove the
solution and dry the radio. Make sure that no water remains entrapped near the connectors, cracks,
or crevices
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (70%) may be applied with a stiff, non-meta llic, short-bristled brush to dislodge
embedded or caked materials located in hard-to-reach areas. The brush stroke should direct the
NOTE: Internal surfaces should be cleaned only when the radio is disassembled for service
or repair.
CAUTION: Certain chemicals and their vapors can have harmful effec ts on certain
plastics. Avoid using aerosol sprays, tuner cleaners, and other chemicals.
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C a u t i o n