Motorola PM400 Service Manual download pdf (Page 182)

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Chapter 3

TROUBLESHOOTING CHARTS

This section contains detailed troubleshooting flowcharts. These charts should be used as a guide in

determining the problem areas. They are not a substitute for knowledge of circuit operation and

astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions

in the theory of operation sections prior to troubleshooting a radio.

Most troubleshooting charts end up by pointing to an IC to replace. It is not always noted, but it is

good practice to verify supplies and grounds to the affected IC and to trace continuity to the

malfunctioning signal and related circuitry before replacing any IC. For instance, if a clock signal is

not available at a destination, continuity from the source IC should be checked before replacing the

source IC.

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Motorola PM400 Service Manual Page 182

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