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3.无5V-S、5V-M、12V电压输出首先,测量有无元器件损坏,若没有,则测量集成电路N801的①脚电压是否大于2V。若大于,说明正常;若小于,则说明输入交流电有问题或者是电容C820损坏。假如在以上均正常的情况下,还是没有电压输出。此时,可以将“二次”侧的小滤波电感L804和L805去掉,直接测量电容C843(空载时,电压为14～17V)和电容C849(空载时,电压约为5.2V)上的电压,若两电容电压符合上述数值,则应该是小滤波电感L804和L805以后电路的问题。根据以往的经验,一般电容
3. No 5V-S, 5V-M, 12V voltage output First, measure whether there is damage to components, if not, measure the integrated circuit N801 ① pin voltage is greater than 2V. If greater than, indicating normal; if less than, then there is a problem with the input AC or capacitor C820 damage. If the above are normal circumstances, there is no voltage output. In this case, the small filter inductors L804 and L805 on the “secondary” side can be removed, and the capacitance C843 (14-17V at no-load) and C849 can be directly measured (at no load, the voltage is about 5.2V) On the voltage, if the two capacitor voltage in line with the above values, it should be a small filter inductor L804 and L805 after the circuit problems. According to past experience, the general capacitance