Motorola SSETM 5000 service manual List of Troubleshooting Charts

Chapter 9 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.

9.1List of Troubleshooting Charts

Most troubleshooting charts (see Table 9-1) 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.

Table 9-1. Troubleshooting Charts List

Chart Title	Page
	Number
Main Troubleshooting Flowchart	9-2
Power-Up Failure	9-3
DC Supply Failure	9-5
Display Failure	9-8
Volume Set Error	9-11
Channel Select Error	9-12
Button Test	9-13
Top/Side Button Test	9-14
VCO TX/RX Unlock	9-15
VOCON TX Audio	9-16
VOCON RX Audio	9-18
RX RF	9-20
TX RF	9-25
Keyload Failure	9-28
Secure Hardware Failure	9-29