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故障现象 使用该机时,先只是缺少测试项目的前两个字符,尚可打印浓度值,用一段时后,连浓度值也打印不出来。
Symptom When using this machine, the first two characters of the test item are missing first, and the density value can still be printed. After a certain period of time, even the density value cannot be printed.