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故障现象开机后自检、第一次摄影曝光均正常,连续第二次摄影曝光无继电器接触声,停机等待2~3 min才能进行第二次曝光或关机后需重新启动曝光又工作正常,再次摄片又出现类似情况。故障分析分析故障原因,高度怀疑计时器故障。该机限时继电器工作原理是按下曝光手闸后,准备继电器闭合,延时继电器KJ1常开变为常闭,单结晶体管导通,此时有正的直流脉动电压加至可控硅G1的极板上,可控硅G1导通
Fault phenomenon After boot self-test, the first photographic exposure are normal, the second consecutive photographic exposure without relay contact sound, stop waiting 2 ~ 3 min to be the second exposure or shutdown after the need to restart exposure and work properly, again A similar situation occurs with the radiography. Failure Analysis Analysis of the cause of the malfunction, highly suspected timer failure. The machine time-delay relay works according to the exposure hand brake, the relay is ready, delay relay KJ1 normally open into normally closed, single-junction transistor conduction, this time there is a positive DC ripple voltage added to the thyristor G1 Plate, SCR G1 conduction