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读了3期张歧文同志一文后,忽然想起我也遇到过同一问题,故障表现几乎相同,解决办法也完全一样。故障现象:据机主介绍,仅中央6台可以收看,其余频道翻滚。接机后通电试机,发现除场失步外,行也失步,且行、场收缩,但伴音正常。检修过程:行、场收缩,说明电源电压过低。果然+B电压由115V降为90V,且有微小摆动。用100W灯泡
After reading one article of Comrade Zhang Qiuwen, I suddenly remembered that I had encountered the same problem. The performance of the fault was almost the same and the solution was exactly the same. Symptom: According to the main introduction, only the central six can watch, the remaining channels roll. After the machine power test machine and found that addition to the field out of step, the line also out of step, and line, field contraction, but the sound is normal. Maintenance process: Line, field contraction, indicating the power supply voltage is too low. Sure enough + B voltage dropped from 115V to 90V, and a slight swing. Use 100W bulb