交流声一般来自电源电路。断开负载电路,测前级输出电压为60V,正常;后级输出电压只有47V(正常应为50V),这说明电源电路存在漏电现象,检查电源据波电容C301~C3O4,发现C302轻微漏电,换新后故障机修到这里,终于修好值得探讨。。 |
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