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我国生产的中型医用X线机，在摄影曝光控制电路中，一般采用电子管限时电路。当电路中出现故障时，摄影曝光则失控。下面以YZ－IOO型X线机为例，介绍限时电路故障1例及检修体会。故障现象：当按下摄影曝光手问（PA）时，摄影曝光下终止，松开PA时曝光终止。分析检修：（1）电路
Medium-sized medical X-ray machines produced in China generally use electron tube time-limited circuits in photographic exposure control circuits. When there is a failure in the circuit, photography exposure is out of control. The following takes the YZ-IOO X-ray machine as an example to introduce one case of fault-tolerance circuit and its maintenance experience. Symptom: When pressing the photographic exposure hand (PA), the photographic exposure is terminated and the exposure is terminated when the PA is released. Analysis and maintenance: (1) Circuit