在此选登两篇有其“果”而不知其“因”的检修文章:一个是奇特故障;另一个是常见故障。作者通过反复检修,最终找到了故障部位。虽然排除了故障,但从理论(电路原理)上尚未弄清楚其病因。“只有理解了的东西,才能深刻地感觉它”。因此,本刊欢迎“有实践经验的战士”、维修高手来稿赐教。并欢迎广大读者们在检修中所遇见的“疑惑不解”和“不理解”的问题随时提出来,以便通过“展开讨论”或“师傅解析“等方法来解决问题,以达到互相交流、学习、升华的目的! Here are two articles that have their “fruit” but do not know their “cause”: one is a peculiar failure; the other is a common failure. Through repeated maintenance, the author finally found the fault site. Although troubleshooting was ruled out, its etiology was not yet known from theory (circuit theory). “Only when I understand it can I feel it profoundly.” Therefore, the magazine welcomes “practical experience of the warriors” maintenance master contributions. And welcomes the readers at the maintenance encountered in the “puzzled” and “do not understand” the issue put forward at any time in order to “discuss” or “teacher analysis” and other methods to solve the problem in order to achieve mutual exchange and learning , The purpose of sublimation!