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故障现象:开机伴音正常,过10分钟后机内出现行频叫声,同时光栅上出现较密的黑横线干扰,图像外边沿有“毛刺”,再过10分钟后,光栅消失。 分析检修:根据故障现象,首先怀疑行输出变压器内部局部短路或有打火现象。更换一新的行输出变压器后,虽然可以长时间工作,一直有光栅,但工作一会后,机内仍有行频叫声,光栅上仍有黑横线干扰,怀疑行部分有接触不良现象。将逆程电容、行
Symptom: boot sound normal, 10 minutes after the machine line frequency barking, while the grating appeared on the black crossbar interference, the image of the outer edge of the “burr”, and then 10 minutes later, the grating disappears. Analysis and maintenance: According to the fault phenomenon, first of all suspect line output transformer internal short circuit or ignition phenomenon. Replacement of a new line of output transformer, although it can work for a long time, there has been a grating, but the work for a while, the machine is still the line frequency sound, the grating is still black horizontal line interference, suspected line some bad contact phenomenon . The reverse capacitor, line