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黑白电视机的+12 V稳压电路元件较多,故障率高,如果电压偏高或偏低时,会诱发更大的故障。当稳压电路出现故障时,可以用一只三端稳压器LA7812来代替,不仅价格低廉、电路简单、而且工作性能可靠,是黑白电视机电源维修的一个有效的方法。用LA7812代替稳压电路接线如下: 1.把LA7812固定在原电源调整管的散热板上,用万用表欧姆档测一下散热板与电路板的连接情况,如果散热板悬空或与地相通,可不必作任何改动。否则,要断开散热板与电路板的连线或给LA7812加云母绝缘片。
Black and white TV +12 V regulator circuit components more, the failure rate is high, if the voltage is high or low, it will induce greater failure. When the regulator circuit fails, you can use a three-terminal regulator LA7812 instead, not only low cost, simple circuit, and reliable performance, is a black and white TV repair power is an effective way. Use the LA7812 instead of the voltage regulator circuit wiring as follows: 1. The LA7812 fixed in the original power conditioning tube cooling plate, with a multimeter ohm file to measure the connection of the cooling plate and the circuit board, if the cooling plate is vacant or connected to the ground, do not have to do Any changes. Otherwise, disconnect the heatsink from the board or add mica insulation to the LA7812.