Chapter 5 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.
5.1 List of Troubleshooting Charts
Most troubleshooting charts (see Table 5-1) 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 5-1. Troubleshooting Charts List
Chart Title Page No.
Main Troubleshooting Flowchart 5-2
Power-Up Failure 5-3
DC Supply 5V Failure 5-15
DC Supply 3 Volt Failure 5-16
DC Supply 1.8 Volt Failure 5-17
DC Supply 1.5 Volt Failure 5-18
Top/CID Display Failure 5-19
Main Display Failure 5-20
Volume Set Error 5-22
Channel Select Error 5-23
Keypad Error 5-24
Side Button Error 5-25
VOCON TX Audio Error 5-26
Keyload Failure 5-30
Secure Hardware Failure 5-31
Removable Memory Failure 5-32
RX RF Failure 5-33
FGU Failure 5-45
FGU Power Failure 5-46
GPS Failure 5-47
PA Failure 5-48
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