Troubleshooting Procedures; Introduction; Handling Precautions - Motorola ASTRO Digital Saber Service Manual

Troubleshooting
Procedures

Introduction

Handling
Precautions
The purpose of this section is to aid in troubleshooting a malfunctioning
ASTRO Digital SABER 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
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
Most of the ICs are static sensitive
devices. Do not attempt to troubleshoot
or disassemble a board without first
referring to the following Handling
Precautions section.
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