Service manual

February 3, 2003 6881076C20-E

2-2 Basic Maintenance: Handling Precautions

2.2.4 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, 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.

2.2.5 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.

Alcohol is a high-wetting liquid and can carry contamination into unwanted places if an excessive

quantity is used. Make sure that controls or tunable components are not soaked with the liquid. Do

not use high-pressure air to hasten the drying process, since this could cause the liquid to puddle

and collect in unwanted places.

Upon completion of the cleaning process, use a soft, absorbent, lint-free cloth to dry the area. Do not

brush or apply any isopropyl alcohol to the frame, front cover, or back cover.

NOTE: Always use a fresh supply of alcohol and a clean container to prevent contamination by

dissolved material (from previous usage).

2.3 Handling Precautions

Complementary metal-oxide semiconductor (CMOS) devices, and other high-technology devices,

are used in this family of radios. While the attributes of these devices are many, their characteristics

make them susceptible to damage by electrostatic discharge (ESD) 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 this radio, and are especially important in low-

humidity conditions. DO NOT attempt to disassemble the radio without observing the following

handling precautions:

• Eliminate static generators (plastics, Styrofoam, etc.) in the work area.

• Remove nylon or double-knit polyester jackets, roll up long sleeves, and remove or tie back

loose-hanging neckties.

• Store and transport all static-sensitive devices in ESD-protective containers.

• Disconnect all power from the unit before ESD-sensitive components are removed or inserted

unless otherwise noted.

• Use a static-safeguarded workstation, through the use of an anti-static kit (Motorola part

number 01-80386A82). This kit includes a wrist strap, two ground cords, a static-control table

mat and a static-control floor mat.

NOTE:Be sure that the table and floor mats are properly grounded.

When these items are not readily available, observing the following techniques will minimize the

chance of damage:

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.

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