一、防止线切割计算机功能键松动引起的故障我厂一台SK－3256型线切割计算机，由于年代已久，近来出现几次故障。比如：计算机走出来的整体图形旋转了90°，这时人们往往误认为是控制机电器问题。经检查电器正常，然后怀疑（图形整体的对称及旋转）功能键失灵；经仔细观察发现 First, to prevent line cutting computer function keys caused by the failure I plant a SK-3256-type wire cutting computer, as a long time ago, there have been several failures recently. For example: the computer out of the overall figure rotated 90 °, then people often mistakenly believe that the problem is to control electrical and mechanical. After checking the normal electrical appliances, and then suspect (the overall graphic symmetry and rotation) function keys failure; after careful observation found