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该作者只画出了电源部分的电路原理图,没有画出行输出供电电路,补充如图5所示。因为C411漏电,对行逆程脉冲电压不能全部滤除。由于L876电感线圈的存在,使行逆程脉冲电压经R855、RP851输入到VQ827,又从VQ827放大后输出, 使光电耦合器NQ826导通,造成 115V电压下降,只要更换C411即可解决问题。为什么去掉L876后, 用电阻代换也可排除故障呢?因为在L876前边还有一个滤波电容 C878(330μF/22OV),能够滤除行
The author only draws the power part of the circuit diagram, not drawn line output power supply circuit, as shown in Figure 5. C411 leakage because of the pulse voltage can not be retrograde filter. Due to the existence of L876 inductor, the line reverse pulse voltage is input to VQ827 via R855 and RP851, and amplified from VQ827 to turn on the optocoupler NQ826, resulting in a voltage drop of 115V. As long as the C411 is replaced, the problem can be solved. Why remove the L876, replace the resistance can also eliminate the problem? Because in front of the L876 there is a filter capacitor C878 (330μF / 22OV), to filter out the line