测+300V端电压正常,而+B端电压输出,查出过压保护二极管VD711(R2M)击穿。用假负载检查开关电源,发现+B电压升高到180左右,又查出稳压取样电阻R718(39 kΩ)变值为无穷大。更换R718后故障排除。 |
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