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采用松下M11机芯的国产彩电,常因场锯齿波形成电容C_(404)(3.3μF/16V)漏电、短路、断路或耐热性差等原因,造成场幅收缩、场幅不稳及水平一条亮线故障,此时调整场幅电位器不起作用。该机芯彩电场扫描电路主要由集成电路IC_(501)(AN5435)与外接的阻容元件构成,场输出电路采用分立式元件构成。由于级间采用直接耦合方式,各点电压相互牵制较大,一旦某点出现故障则其他各点电压均会偏离正常值,因此检修时首先要确定故障是在场输出电路还是在IC_(501)内部。最
Panasonic M11 movement using domestic color TV, often due to field sawtooth capacitor C_ (404) (3.3μF / 16V) leakage, short circuit, open circuit or poor heat resistance and other reasons, resulting in field contraction, field instability and a level Bright line fault, then adjust the field potentiometer does not work. The movement color TV field scanning circuit mainly consists of integrated circuit IC_ (501) (AN5435) and external RC components, field output circuit using discrete components. Because of the direct coupling between stages, the voltages of the points are greatly checked each other. When a certain point fails, the voltages of other points will deviate from the normal values. Therefore, the overhaul must first determine whether the fault is present in the output circuit or within IC_ (501) . most