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一台金凤C47S2型47 cm(18英寸)彩电的“彩管”,因年久老化,只有不太亮的水平紫线。原管型号是470MWB22,拟换新日立彩管,型号是470KAB22。两管屏幕尺寸相同,都是偏转角相同的粗枪显像管。两管极限使用参数虽然有较大差别,但新管极限值均在旧管极限值范围之内。两管均有枕形失真需枕形校正,恰好此机线路板上有相应配套元件。只是两管偏转线圈直流参数有点差别,管座不同,旧管是12个脚,新管是13个脚。比较两管各项差异,认为可以代换。为保证代换,考虑应先将机器修好,使其能有正常光栅和图像,以避免代换调整时遇到麻烦,因为有水
A Jinfeng C47S2 47 cm (18 inches) color TV “CPT”, due to aging, only the not too bright horizontal purple line. The original tube model is 470MWB22, intended for the new Hitachi CPT, the model is 470KAB22. The two screens have the same screen size and are all thick gun tubes with the same deflection angle. Although the two limit the use of parameters are quite different, but the new tube limit values are within the limits of the old tube. Pillow-shaped distortion of both the two need to pin-shaped correction, exactly this machine circuit board has the appropriate components. Just two tube deflection coil DC parameters a little different, different tube, the old tube is 12 feet, the new tube is 13 feet. Compare the two differences, that can be replaced. In order to ensure substitution, consider repairing the machine first so that it can have normal rasters and images to avoid trouble in substitution adjustment because of the water