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Introduction
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General This manual includes all the information needed 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 XTS 3000 Portable Radios Basic
Service Manual (Motorola part number 68P81083C85), which uses the
pass/fail service approach to radio problems.
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 disassembly/reassembly
procedures, functional block diagrams, detailed theory of operation,
troubleshooting charts and waveforms, schematics and parts lists, a nd
exploded view and parts list. The technician should be very familiar
with these sections to aid in determining the problem circuit. Also
included are component location diagrams to aid in locating
individual circuit components and some IC diagrams, which point out
some convenient probe points.
The theory of operation sections of this manual contain detailed
descriptions of the 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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