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例1:故障现象与分析:光栅上、下部均被压缩,但上部压缩较多。由故障现象初步判定场振荡、扫描或场输出电路有问题。 检修方法:先检查场幅、场线性电路的调节电阻及阻容元件没发现问题;再测扫描解码集成块N501的24-29脚电压及场输出电路三极管V301-V303各极电压也全部正常,说明故障不在直流通路,应属交流通路的电容变值或断路引起的。重点检查几个影响场幅的电容后,发现自举电容C312已失效,更换一个10μ/50v的电容后,故障排除。因为有些电容变值或断路并
Example 1: Fault phenomenon and analysis: grating upper and lower are compressed, but the upper compression more. Judging by the symptoms of the initial tentative field oscillation, scanning or field output circuit problems. Maintenance methods: first check the field, the field of linear resistance and resistance adjustment circuit components did not find any problems; re-test scan decoding block N501 24-29 pin voltage and field output transistor V301-V303 each pole voltage are all normal, Note that the fault is not in the DC path, should be a change in the capacitance of the AC path or open circuit caused. After examining several capacitors that affect the field amplitude, we found that the bootstrap capacitor C312 has failed, and after replacing a 10μ / 50v capacitor, the problem is solved. Because some of the capacitance change or open circuit and