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一、故障现象:被检修的X200—ⅡB型200毫安X线机是某县医院经常使用的一台X线机,透视时发现高压变压器负载声很大并发现萤光屏亮度较暗,毫安表指数为2毫安,电源电压降大,高压继电器工作3至4秒钟之后,高压初级保险丝熔断。二、由现象分析判别故障:高压初级保险丝熔断应考虑高压回路中电流过大有短路存在,应作以下分析。 (一)根据X200—ⅡB型毫安测量电路图分析,该机为全波桥式整流,观察
First, the phenomenon of failure: The X200-IIB type 200 mA X-ray machine that was overhauled is a X-ray machine that is often used in a county hospital. When it is seen through the perspective, it is found that the high-voltage transformer has a loud sound and the brightness of the fluorescent screen is relatively low. The ampere meter index is 2 milliamperes, and the power supply voltage drops. After the high voltage relay operates for 3-4 seconds, the high voltage primary fuse blows. Second, by the phenomenon of analysis to identify faults: high-voltage fuses fuse should consider the high voltage loop current is too short there, should be the following analysis. (I) According to the X200-IIB milliampere measurement circuit diagram analysis, the aircraft is full-wave bridge rectifier, observe