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阐述针式打印头工作原理；分析故障；介绍换针方法；讨论横移机构、色带机构和色带打印机中特有故障；介绍检测方法和维修技巧。
Describe the working principle of the stylus print head; analyze the troubles; introduce the needle changing method; discuss the special troubles in the transfer mechanism, the ribbon mechanism and the ribbon printer; introduce the testing method and the maintenance skill.