Chapter 2 Basic Maintenance; Introduction; Preventive Maintenance; Inspection - Motorola ASTRO XTL 5000 Basic Service Manual

Chapter 2 Basic Maintenance

2.1

Introduction

This section of the manual describes preventive maintenance, handling precautions, and some basic
repair procedures and techniques. Each of these topics provides information vital to the successful
operation and maintenance of your radio.
NOTE: For board- and component-level repair of the radio, refer to the Detailed Service Manual (see
"Related Publications" on page xii
2.2

Preventive Maintenance

Radios are shipped from the factory with a worst-case frequency error of ±500 Hz for 700–800 MHz.
These specifications are tighter than the more stringent FCC requirements of ±1.5 ppm for the 700–
800 MHz bands. For radios that have been in storage for over six months from the factory ship date,
the reference oscillator should be checked when the radio is initially deployed to the field. It is
strongly recommended that the reference oscillator be checked every time the radio is serviced or at
least once a year, whichever comes first. The crystal contained in the reference oscillator naturally
drifts over time due to its aging characteristic. Periodic (annual) adjustment of the reference oscillator
is important for proper radio operation. Improper adjustment can result in both poor performance and
interference with other users operating on adjacent channels.
2.2.1

Inspection

Check that the external surfaces of the radio are clean, and that all external controls and switches
are functional. A detailed inspection of the interior electronic circuitry is not needed.
2.2.2

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 control
head and radio chassis. These surfaces should be cleaned whenever a periodic visual inspection
reveals the presence of smudges, grease, and/or grime. 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).
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C a u t i o n

2.2.2.1 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.
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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