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一台岛津SDL-100A型B超仪,在使用多年之后,其观察用监视器突然出现行幅、帧幅都异常增大的故障;监视屏上的图像变大、模糊,图像的周围部分(包括灰阶带、刻度、字符)都“溢出”至屏幕之外而不能显示,而照像用监视器的图像却完全正常。由于两个监视器都是由同一个信号通道供给,故判断故障出在观察用监视器内。 打开观察用监视器的外罩,先检查电源部分。经测试发现供给显像管加速极的+400V中压(MV)不足,
After a Shimadzu Model SDL-100A B-scanner was used for many years, its observation monitor suddenly had a problem of abnormally increasing line width and frame width; the image on the monitor screen became large and blurred, and the surrounding portion of the image was blurred. (Including grayscale bands, scales, and characters) all “overflow” out of the screen and cannot be displayed, and the camera monitor image is completely normal. Since both monitors are supplied from the same signal path, it is determined that the failure is in the observation monitor. Open the cover of the observation monitor and check the power supply first. Tested to find that the +400V medium voltage (MV) supply to the accelerating pole of the kinescope is insufficient.