最近,笔者维修的几个电视机为遥控器却颇费周折,故障现象为按键时电视机不起反应。为了缩小范围,找一相同的遥控器试验,发现是原机遥控器的故障。按照一些资料介绍,用中波收音机检验,当按键时能接收到“嗒嗒……”的声音,认为遥控器的振荡器正常。于是检查了红外发射电路,换了二极管,故障没有排除。又继续检查了放大管及偏置电阻,均未见异常。按键时能在集成块的输出脚测到变化的电平,证明集成块有输出,故障在发射电路。当我换遍了所有有关的元件,仍未能修复,只好放在一边。后来修理另一个遥 Recently, I repair a few televisions for the remote control is a twists and turns, the failure phenomenon is the TV can not afford to respond when the button. In order to narrow the range, find a same remote control test and found that the original machine remote control failure. According to some information, with the radio wave test, when the button can receive a “click ...” sound, that the remote control oscillator normal. So check the infrared transmitter circuit, for the diode, the fault did not rule out. Also continue to examine the amplifier and bias resistors, were no exception. Press the output pin of the integrated block can be measured when the level changes to prove the output of the manifold, the fault in the transmitter circuit. When I changed all the relevant components, still failed to repair, had to put aside. Later repair another remote