Chapter 5 Troubleshooting Procedures; Introduction; Handling Precautions - Motorola ASTRO XTS 5000 Detailed Service Manual

Chapter 5 Troubleshooting Procedures

5.1

Introduction

The purpose of this section is to aid in troubleshooting problems with the ASTRO XTS5000 radio. It
is intended to be detailed enough to localize the malfunctioning circuit and isolate the defective
component.
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C a u t i o n
5.2

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). This kit includes a wrist strap, two ground
cords, a static-control table mat and a static-control floor mat. For additional information, refer
to Service and Repair Note SRN-F1052, "Static Control Equipment for Servicing ESD Sensi-
tive Products," available from Literature Distribution.
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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