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Radar antenna is an important part of CINRAD/SA. For the complexity of its control process and the long running time, the failure rate of antennas is usually higher than the other parts of the radar subsystems. Taking a control sequences timeout failure of CINRAD/SA for an example, an analysis is made of the state and control information between the data acquisition unit (DAU) and the radar data acquisition processor (RDASC Processor) in depth, and the key hardware troubleshooting methods are summarized, for the purpose of the radar antenna maintenance, repair and technical support, so as to accumulate experiences for rapid troubleshooting.