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这里所说的“黑屏”故障是指电源电路、通道电路、行扫描电路等基本正常,开机后灯丝点亮,有高压放电声,且伴音正常,而由其他原因造成的无光栅故障。对于这类故障,我们若先调节加速极电位器,提高加速极电压(修理后应及时还原),根据屏幕上的变化,再作进一步判断和修理,往往会收到事半功倍的效果。提高加速极电压后,屏幕上的变化大致有以下三种情况:(1)仍无光栅;(2)屏幕上出现白亮的回扫线;(3)屏幕上出
The “black screen” fault here means that the power circuit, the channel circuit, the line scanning circuit and the like are basically normal. When the power is turned on, the filament is lit, a high-pressure discharge sound is generated, and the sound is normal, but the grating failure caused by other causes. For such failures, if we first adjust the accelerator pole potentiometer to increase the voltage pole (repair should be promptly restored), according to the changes on the screen, then further judgments and repairs, often will receive a multiplier effect. Increase the acceleration voltage, the screen changes are roughly the following three conditions: (1) there is no grating; (2) the screen appears white bright flyback line; (3) the screen out