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本文分析针式打印机的字车故障，阐述故障范围的判断及测试方法，讨论故障原因和其失效机理，为正确地维护、使用针式打印机提供借鉴。
This article analyzes the character printer word car fault, expounds the scope of the fault judgment and test methods to discuss the causes of failure and failure mechanism, in order to correctly maintain, use the needle printer to provide reference.