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故障现象:伴音正常,但屏幕上水平一亮线。分析检修:图1绘出该机场扫描系统电路图。可将此电路分成两部分:一是N240(TDA8361)(10)、(41)、(42)、(43)脚内部电路为核心,与其外围元件构成的场扫描信号振荡级;二是以N301(TDA3654)为核心,与其外围元件及场偏转线圈构成的场扫描OTL电路输出级。场振荡级与场输出级之间,通过交、直流负反馈电路(图
Symptoms: sound normal, but the level of a bright screen. Analysis and Maintenance: Figure 1 depicts the airport scanning system circuit diagram. This circuit can be divided into two parts: one is N240 (TDA8361) (10), (41), (42), (43) foot of the internal circuit as the core, and its peripheral components constitute the field scanning signal oscillation level; the second is N301 (TDA3654) as the core, with its peripheral components and field deflection coil field scanning OTL circuit output stage. Field oscillation level and field output level, through the AC and DC negative feedback circuit (Figure