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The transmitter driver is a very important part of CINRAD/SA and SB Radar. Its technical parameters not only determine the basical output RF pulse and spectrum of the transmitter, but also influence directly the operating quality of the radar system. The operating principles of the CINRAD/SA and SB Radar transmitter driver are discussed in details, and a thorough hardware analysis is made of the working diagram of the driver, which comprised 3A4 and 3A5. Also some useful adjustment methods and a number of keypoint waveforms, as well as the related timing sequence, are introduced. According to the radar system maintenance experiences, some basic electronic troubleshooting thoughts and quick maintenance methods are discussed and summarized, in combination with the relevant alarm massages.