Motorola GM Series Instrukcja serwisowa - Strona 17

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1.0

Introduction

This chapter of the manual describes:

preventive maintenance

safe handling of CMOS devices

repair procedures and techniques

2.0

Preventive Maintenance

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

inspection and cleaning is recommended.

2.1

Inspection

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.

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 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 servicing 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: 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.

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 radio. A soft, absorbent, lintless 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.

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. 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 since this could cause the liquid to collect in unwanted

places. Upon completion of the cleaning process, use a soft, absorbent, lintless cloth to

dry the area. Do not brush or apply any isopropyl alcohol to the frame, front or back cover.

Chapter 2

MAINTENANCE