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一、故障现象:作自动透视后,进行自动点片,一按点片曝光手闸,控制台上的“OVER”指示灯亮,曝光被阻断,并且与透视的kv高低无关;但手动点片和一般照相可以进行。二、分析与检查:从上述故障现象看出, “OVER”指示灯亮与kv的高低无关,而只与mA关,并且只与自动曝光mA控制电路有关。现用逆转法分析和检查故障。1.“OVER”指示灯电路如图1所示。根据电路原理:检查发现继电器动作。
First, the fault phenomenon: for automatic perspective, the automatic point film, a point film exposure hand brake, console “OVER” light is on, the exposure is blocked, and the level of kv perspective; but manual point film And general photography can be done. Second, the analysis and inspection: seen from the above symptoms, “OVER” indicator light has nothing to do with the level of kv, but only with mA off, and only with automatic exposure mA control circuit. Analysis of the current reverse method and check the fault. 1. “OVER” indicator circuit shown in Figure 1. According to the circuit principle: check the relay action.