The frequency synthesizer is an important part of CINRAD, which decides directly the working frequency of the CINRAD transmitter and the coherence of the whole total CINRAD, and is also a key factor influencing the phase noise in CINRAD. At present, radar users usually think it as a black box: only know its output signal parameters without locating the inter faults. The working principles and the block diagram of integrated generator of CINRAD/SB are explained, based on which, some examples of its fault location are given by making use of the standardized maintenance process of electronic equipment, combined with the radar fault phenomena. The procedures of fault location for radar users are illustrated，so to help radar maintenance personnel improve the capability of equipment technical support.