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下面我以康艺8080—2S收录机为例,介绍一下电源电路的常见故障及检修方法。一、电源电路工作原理电源电路构成方框图见图1,电源电路图见图2。电源电路是这样工作的: 220V或110V的交流市电通过熔断丝(保险丝)送入电源变压器的初级,由次级输出7.5V的交流电压。二级管D_(13)、D_(14)、D_(15)、D_(16)和电容C_(141)、C_(142)、C_(143)、C_(144)构成桥式整流电路;电解电容器C_(139)是滤波电容,经过滤波后得到电压9V,且比较平滑的直流电,它可供使用。
Now I use the 8080-2S Kang Yi recorder as an example, introduce the common faults of power circuits and maintenance methods. First, the working principle of the power circuit Power circuit block diagram shown in Figure 1, the power circuit shown in Figure 2. The power circuit works like this: 220V or 110V AC mains is fed into the primary side of the mains transformer through a fuse (fuse), with a secondary output of 7.5V AC. The bridge diodes D_ (13), D_ (14), D_ (15), D_ (16) and capacitors C_ (141), C_ (142), C_ (143) and C_ (144) Capacitor C_ (139) is the filter capacitor, filtered to give a voltage of 9V, and a relatively smooth DC, which is available for use.