由于画面没有雪花噪声点,可以判断故障出在接收机上。此时,可能造成这种故障的原因有:(1)电源部分故障整机或部分电路的供电中断,原因可能有电源保险丝烧断、电源线或插头断线。对于串联型稳压电源,可能电源变压器初级断路、调整管损坏、滤波用电解电容击穿等;对于开关电源,可能是开关管击穿、高压滤波电容击穿、高压整流管击穿等。或者由于机内电路某处短路或中频电缆短路,造成电源部 As the screen is no snow noise point, you can determine the fault on the receiver. At this moment, the reasons that may cause this kind of trouble are: (1) Partial power failure The power supply of the whole machine or part of the circuit is interrupted because the power fuse may be broken, the power cord or the plug is disconnected. For the series power supply, power transformer may be the primary circuit, adjust the tube damage, electrolytic capacitors electrolytic breakdown, etc .; for the switching power supply, may be the switch breakdown, high-voltage filter capacitor breakdown, high-voltage rectifier breakdown and so on. Or because the machine somewhere in the circuit short-circuit or IF cable short circuit, resulting in the Department of power