2-2 Introduction
The only factory recommended liquid for cleaning the printed circuit boards and their components is
isopropyl alcohol (100% by volume).
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (100%) may be applied with a stiff, non-metallic, short-bristled brush to dislodge
embedded or caked materials located in hard-to-reach areas. The brush stroke should direct the
dislodged material out and away from the inside of the repeater. Make sure that controls or tunable
components are not soaked with alcohol. Do not use high-pressure air to hasten the drying process
since this could cause the liquid to collect in unwanted places. Once the cleaning process is
complete, use a soft, absorbent, lintless cloth to dry the area. Do not brush or apply any isopropyl
alcohol to the top cover and repeater enclosure.
2.1.3 Safe Handling of CMOS Devices
Complementary metal-oxide semiconductor (CMOS) devices are used in this family of stations, and
are susceptible to damage by electrostatic or high voltage charges. Damage can be latent, resulting
in failures occurring weeks or months later. Therefore, special precautions must be taken to prevent
device damage during disassembly, troubleshooting, and repair.
Handling precautions are mandatory for CMOS circuits and are especially important in low humidity
conditions.
Note
Internal surfaces should be cleaned only when the station is disassembled for service or
repair.
Note
Always use a fresh supply of alcohol and a clean container to prevent contamination by
dissolved material (from previous usage).
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