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当你检修电视机的水平亮线或亮带故障、又难以确定故障发生在场振还是场输出级时、制作一个简易50赫信号源,用它能迅速确定故障部位,大大加快检修速度,也避免走弯路。 50赫信号可从220V市电降压取得,我是用一只旧电子管收音机电源变压器,在线包与铁芯的缝隙里穿绕四圈漆包线制成。也可用电铃变压器或3W以上的音频变压器加绕次级制成,只要注意它的输出电压在0.5V上下即可。 使用时先焊开场振荡与场输出级的连线,把变庄器的低压输出接到场输出级的输入与地之间,将初级接入220V市电,再接通电视机的电源,此时如果光栅上下拉开,表明场输出级完好,故障在场振荡级,如仍为一条亮线则故障在场
When you troubleshoot a TV’s horizontal bright or bright band and find it difficult to determine when a fault occurs in the field or at the field output level, make a simple 50 Hz source and use it to quickly identify the fault location, greatly speeding up access and avoiding Detours 50 Hz signal can be obtained from the 220V power step-down, I am using an old tube radio power transformer, online package and the core of the gap in the ring around the four laps made of enameled wire. Also available bell transformers or more than 3W audio transformer plus secondary made, as long as the attention of its output voltage can be up and down in the 0.5V. When the first open-field oscillation with the field output level of the connection, the low-voltage output of the device connected to the field output level between the input and ground, the primary access 220V mains, then turn on the TV’s power supply, this time If the raster is pulled up and down, it indicates that the output stage of the field is in good condition and the level of the on-site oscillation is still present. If the line is still in a bright line, the fault is present