Motorola PRO7350 기본 서비스 매뉴얼 - 페이지 17

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Chapter 3

Maintenance

3.1

This chapter provides details about the following:

Preventive maintenance (inspection and cleaning)

Safe handling of CMOS and LDMOS devices

Disassembly and reassembly of the radio

Installation of Optional Retroﬁt Kit

Installation of Option Boards

3.2

The radios do not require a scheduled preventive maintenance program; however, periodic visual

inspection and cleaning is recommended.

Check that the external surfaces of the radio are clean, and that all external controls and switches are

functional. It is not recommended to inspect the interior electronic circuitry.

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 assembly, and battery case. These surfaces should be cleaned whenever a periodic

visual inspection reveals the presence of smudges, grease, and/or grime.

NOTE Internal surfaces should be cleaned only when the radio is disassembled for service

or repair.

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).

CAUTION: Certain chemicals and their vapors can have harmful effects on certain plastics.

Avoid using aerosol sprays, tuner cleaners, and other chemicals.

Cleaning External Plastic Surface

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-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 radio. Make sure that controls or tunable

components are not soaked with alcohol. Do not use high-pressure air to hasten the drying process

3-1