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To summarize the maintenance techniques of the CTL 713C weather radar receiver comprehensively, an analysis is made of the main component circuits and functions of the receiver, and the schematic signal flow chart is presented. The CTL 713C weather radar receiver faults are analyzed, and troubleshooting methods is discussed. The frame of reference for radar receiver maintenance is given: looking through the whole, starting with the easy, testing comprehensively, and being familiar with the working principles.