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故障现象:透视图像清晰,但表头指示总小于1毫安且不受调,按下照像手闸,毫安表立即回零,准备指示灯不亮,照像失败。故障分析与检修:由较明显的故障现象着手,根据准备(READY)指示灯不亮,从控制台的时序图上查知,继电器K_3(R—1)工作后瞬间,准备继电器K_1—RE就得电工作,准备指示灯同时点亮。拆开控制台,与实物相对照,发现照像时K_3(R—1)已经工作,但K_1—RE始终未得电,故准备指示灯不亮,是什么原因导致K_1—RE不能得电呢?
Symptoms: perspective image is clear, but the total head indicating less than 1 mA and not subject to adjustment, press the camera hand brake, milliampere table immediately back to zero, prepare the indicator light does not shine, the camera fails. Fault analysis and maintenance: starting from the more obvious symptoms, according to the READY indicator is not lit, check the timing chart on the console, the relay K_3 (R-1) work immediately after the preparation relay K_1-RE Got electricity work, ready to light at the same time. K_3 (R-1) has been working, but K_1-RE is still not powered, so the preparation indicator is not lit, what causes K_1-RE can not get it yet? ?