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故障现象：开机自检及检测分析工作正常，用内部打印机打印分析结果时，无任何反应。分析检修：机器自检及检测分析工作正常，仅内部打印机不能打印分析结果，说明仪器主机、软件正常，因为手头无该机任何维修资料，估计故障部位应在内部打印机或打印机与主机接口部分。首先打?
Symptoms: The power-on self-test and detection and analysis are working properly. When the internal printer prints the analysis results, nothing happens. Analysis and maintenance: The machine self-test and detection and analysis work normally. Only the internal printer can not print the analysis result. It means that the instrument host and software are normal. Since there is no any maintenance information on the machine, it is estimated that the fault location should be in the internal printer or printer and host interface part. First hit?