Chapter 1 Introduction; General - Motorola ASTRO Digital Spectra Plus Service Manual

Chapter 1 Introduction

1.1

General

This manual includes all the information necessary to maintain peak product performance and
maximum working time. This detailed level of service (component-level) is typical of some service
centers, self-maintained customers, and distributors.
Use this manual in conjunction with the ASTRO Digital Spectra and Digital Spectra Plus Mobile
Radios Basic Service Manual (Motorola part number 6881076C20), which helps in troubleshooting a
problem to a particular board.
Conduct the basic performance checks first to verify the need to analyze the radio and help pinpoint
the functional problem area. In addition, you will become familiar with the radio test mode of
operation which is a helpful tool. If any basic receiver or transmitter parameters fail to be met, the
radio should be aligned using the radio alignment procedure described in the ASTRO Digital Spectra
and Digital Spectra Plus Mobile Radios Basic Service Manual.
Included in other areas of this manual are functional block diagrams, detailed Theory of Operation,
troubleshooting charts and waveforms, schematics, and parts list. You should be familiar with these
sections to aid in deducing the problem circuit. Also included are component location diagrams to aid
in locating individual circuit components, as well as IC diagrams, which identify some convenient
probe points.
The Theory of Operation section of this manual contains detailed descriptions of operations of many
circuits. Once you locate the problem area, review the Troubleshooting Chart for that circuit to fix the
problem.