Chapter 4 Troubleshooting Procedures
The purpose of this chapter is to aid in troubleshooting problems with the ASTRO APX 2000/
APX 4000/ APX 4000Li/ APX 1000 (900 MHz) radio. It is intended to be detailed enough to localize
the malfunctioning circuit and isolate the defective component. It also contains a listing of service
tools recommended for PC board repair at the component level.
4.1 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.
1. Eliminate static generators (plastics, Styrofoam, etc.) in the work area.
2. Remove nylon or double-knit polyester jackets, roll up long sleeves, and remove or tie back
loose-hanging neckties.
3. Store and transport all static-sensitive devices in ESD-protective containers.
4. Disconnect all power from the unit before ESD-sensitive components are removed or
inserted unless otherwise noted.
5. Use a static-safeguarded workstation, which can be accomplished through the use of an
anti-static kit (Motorola part number 01-80386A82) or equivalent.This kit includes a wrist
strap, two ground cords, a static-control table mat and a static-control floor mat.
Most of the ICs are static sensitive devices. Do not attempt to
disassemble the radio or troubleshoot a board without first
referring to the following Handling Precautions section.
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