新科SVD—260(A)VCD采用了伺服、解码一体化电路板,质量优良,深受广大消费者喜爱,在本地社会拥有量较大。该机随机未附电路原理图,本人在维修该机型的过程中,将电源电路进行了实测实绘,并对其电源原理及典型故障进行简述,供广大读者和同行参考。一、电源工作原理如图1所示。220 V交流电压进入工频变压器T的初级线圈,变压器次级的绕组分别输出3 V、30 V、双12 V、双7.8 V四组低压交流电压。第一组输出3 V低压交流电压,该电压经过排插 The new SVD-260 (A) VCD uses servo, decoding integrated circuit board, good quality, loved by the vast number of consumers, a larger share of the local community. The machine is not attached to the circuit schematic diagram, I repair the model in the process, the power circuit was measured actually painted, and its power principle and typical faults are briefly described, for the majority of readers and colleagues reference. First, the power principle shown in Figure 1. The 220V AC voltage enters the primary winding of the power frequency transformer T, and the secondary winding of the transformer outputs four sets of low voltage AC voltages of 3V, 30V, double 12V and double 7.8V respectively. The first group outputs a 3 V low voltage AC voltage that is routed