A3电源 故障现象:时偏红色,时屏幕大小缩放,时帧抖,时无彩黑白图正常。 打开机壳试放半小时,先从图缩放下手,查+B105V(正常115V),正供电25V(正常27V);查电源光耦--好,A1015--好,C3807--好;查稳压6.2V,C1815,100K取样全正常,奇怪? 最后查可调电阻变值,换2k可调,微调到+B115V后一切正常! |
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