故障现象：按正常操作规程开机时应：①先吸进清洁液，待吸液指示红灯熄灭打出结果后，再按下吸液开关，红灯亮同时吸入标本液。②放松吸液开关，红灯灭，仪器开始检测并打印出结果。而我们在操作中遇到的故障现象是：吸入清洁液后红灯灭时，清洁液从吸液管回流出来，吸标本液 Symptoms: According to the normal operating procedures should be switched on: 1 first into the cleaning fluid, to be aspiration instructions indicate that the red light goes out, then press the suction switch, the red light at the same time inhalation of specimen fluid. 2 Relax the aspiration switch, the red light goes out, the instrument starts to detect and print out the result. The failure phenomenon we encountered in the operation is: when the red light is turned off after the cleaning liquid is inhaled, the cleaning liquid is returned from the pipette and the sample solution is sucked.