Chapter 1 Introduction
This manual contains information needed for Levels One and Two radio servicing. Level One
servicing consists of radio programming, radio alignment, knobs replacement, and installation and
removal of the antenna, belt clip, battery, and universal connector cover. Level Two servicing covers
disassembly and reassembly of the radio to replace circuit boards.
1.1 Manual Contents
Included in this manual is radio specification for the VHF (136–174 MHz), UHF1 (380–470 MHz),
UHF2 (450–520 MHz), 700/800 MHz (764–870 MHz) and 900 MHz (896–941 MHz) frequency
bands, a general description of ASTRO APX 2000/ APX 4000/ APX 4000Li models, recommended
test equipment, service aids, radio alignment procedures, general maintenance recommendations,
procedures for assembly and disassembly, and exploded views and parts lists.
1.2 Notations Used in This Manual
Throughout the text in this publication, you will notice the use of note, caution, warning, and danger
notations. These notations are used to emphasize that safety hazards exist, and due care must be
taken and observed.
NOTE: An operational procedure, practice, or condition that is essential to emphasize.
CAUTION indicates a potentially hazardous situation which, if
not avoided, might
result in equipment damage.
WARNING indicates a potentially hazardous situation
which, if not avoided, could
result in death or injury.
DANGER indicates an imminently hazardous
situation which, if not avoided, will
result in death or
injury.
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