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黑白显像管老化常见的故障是光栅变暗,检修时发现显像管直流供电、阴极电压基本正常,仅给灯丝供电,测栅阴电阻明显变大(大于10kΩ),下面谈谈不换显像管可增大亮度的几种方法,供读者选用。 1.提高直流稳压,但不能太高,不然会加速灯丝的衰老,一般增大2V左右为宜。 2.增大栅极电压,使阴栅电压减小,亮度增大。具体做法是在阴栅脚间加接一个1MΩ到2MΩ的电阻,或在加速极与栅极间加接一个3MΩ到5MΩ的电阻。
Common black-and-white CRT aging is the grating darker, overhaul found CRT power supply, the cathode voltage is normal, only to the filament power supply, measured significantly increased resistance grid (greater than 10kΩ), the following does not change the picture tube can increase the brightness Several methods for readers to choose. 1. To improve the DC voltage regulator, but not too high, otherwise it will speed up the filament aging, the general increase of about 2V is appropriate. 2. Increase the gate voltage, so that the grid voltage is reduced, the brightness increases. The specific method is to add a 1MΩ to 2MΩ resistance between the pin or add a 3MΩ to 5MΩ resistance between the acceleration pole and the gate.