本讲将介绍在机床数控系统维修中的元器件替代知识、技术要求与基本原则。由于维修的最终目的是“测故、换件”,而在实际操作过程中出于种种复杂的原因,例如:系统本身结构不同、产品出厂年代有先后、系统配套部件来源各异等等,使系统故障出现的表征与部位各不相同。因此,单凭以某种系统的固有特性去分析系统故障是困难的,而应力求对故障分析的侧重点 This talk will introduce the replacement knowledge, technical requirements and basic principles of components in CNC system maintenance. As the ultimate goal of maintenance is to “test and change parts”, and in actual operation for a variety of reasons, such as: the system itself is different in structure, the product has its own production date, system components, etc. vary, so that The appearance and location of the system failure are different. Therefore, it is difficult to analyze the system fault solely by the inherent characteristics of a certain system, and the stress on failure analysis should be sought