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三、电源与保护电路维修技巧1.开关电源维修(1〕主开关电源不工作可先测量开机瞬间的+112V电压,若+112V压在每次开机瞬间产生,但很快消失为OV,这说明开关电源本身正常,只是保护电路发生了动作。若开机瞬间也不产生112V电压,这说明主开关电源身有故障,可继续进行下列检查:①R414、R415、R416开路,使V404无启动电压
Third, the power and protection circuit repair skills 1. Switching power supply maintenance (1) the main switch power supply does not work can be measured first boot instantaneous voltage of 112V, if the + 112V pressure generated in each boot instant, but quickly disappear to OV, which Indicating that the switching power supply itself is normal, but the protection circuit has taken place.If the boot moment does not produce 112V voltage, indicating that the main switch power supply failure, can continue to carry out the following checks: ①R414, R415, R416 open, so V404 no start voltage