Introduction; General - Motorola ASTRO Digital Saber Service Manual

Introduction

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.
This manual is to be used in conjunction with the ASTRO Digital
SABER Portable Radios Basic Service Manual (Motorola part number
68P81076C05), which helps troubleshooting a problem to a particular
board. Conduct the basic performance checks first. This will verify the
actual need for analyzing the radio and help pinpoint the functional
problem area. In addition, the technician will become familiar with
the radio test mode of operation, which is a helpful tool. If any basic
receive or transmitter parameters fail, then the radio should be aligned
per the radio alignment procedure.
Included in other areas of this manual are functional block diagrams,
detailed theory of operation, troubleshooting charts and waveforms,
schematics, and parts list. The technician should be very familiar with
these sections to aid in deducing the problem circuit. Also included are
component location diagrams to aid in locating individual circuit
components and some IC diagram, which point out some convenient
probe points.
The theory of operation sections of this manual contain detailed
descriptions of operations of many circuits. Once the area of the
problem is located, it would be strongly advisable to review the
operation of the circuit pertaining to the troubleshooting flow chart.
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