本文阐述了Auto DELFIA1235全自动时间分辨荧光免疫分析仪的基本工作原理、加样针液面探测原理、负压管路原 理和荧光测量原理。针对使用中出现的加样针液面探测故障、负压产生超时和光路故障进行分析，通过更换RAR板贴片电 感、电磁阀、光电二极管排除故障，使设备恢复正常工作。本文的案例分析能为该免疫分析仪故障的快速修复和日常维护 提供参考，以保证设备正常运行及检测结果的准确性，提高医院的医疗服务水平。

This paper described the basic working principle of Auto DELFIA1235 automatic time-resolved immune analyzer, the principle of detecting the liquid level with sample injection, the principle of negative pressure pipeline and the principle of fluorescence measurement. The problems of detecting liquid level of the injection needle, negative pressure timeout and light path fault were analyzed in this paper, by replacing the SMT inductance of RAR board, solenoid valve and photodiode, the equipment was returned to normal operation. The case analysis in this paper can provide reference for the prompt repair of the faults and daily maintenance, so as to ensure the normal operation of the equipment and the accuracy of the test results, and improve the level of medical services in hospitals.