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文章阐述了东芝800mA电视X线机自动亮度控制电路工作原理,并给出故障检修及线路改进方法。 F.ABC电路即透视自动亮度控制电路。通过该电路可以自动调节X线管两极间的直流高压,达到透视不同对象在电视荧光屏上都可以得到亮度适当,对比度清晰的X线透视影象,实现透视亮度调节自动化。 F.ABC电路部件装在一个插件盒内,该盒插在主机控制台右侧,电原理图号为3XWO1—2019,通过在控制台内与F.ABC电路有关联接的其它电路,最终使透视KV调压器拖动电机(在控制台内)正转或反转,实现透视KV的自动调节。
This article describes the Toshiba 800mA TV X-ray machine automatic brightness control circuit works, and gives troubleshooting and line improvement methods. F.ABC circuit that perspective automatic brightness control circuit. The circuit can automatically adjust the X-ray tube between the DC high voltage, to achieve the perspective of different objects on the TV screen can get the appropriate brightness, sharp contrast X-ray perspective image, to achieve perspective brightness adjustment automation. The F.ABC circuit components are housed in a plug-in box that is plugged into the right side of the main console and has an electrical schematic number of 3XWO1-2019. Through the other circuitry associated with the F.ABC circuit in the console, KV regulator drag motor (in the console) forward or reverse, to achieve the perspective KV automatic adjustment.