本文介绍一例磁力搅拌器电机损坏的检修。 故障现象: 所有标本测定值极不稳定,忽高忽低。 故障分析与检查方法: 测定值不稳定,与标本和试剂的混合池没有充分混合有关。首先,在仪器近旁未能听到磁力搅拌电机运转的声音,查看磁块不动。根据电原理图（见图1所示）,CPU送来的搅拌电机控制信号经过IC8（DP8311N）直接驱动电机。IC8第11脚输出为“O”时,电机运转;输出为 This article describes an example of the repair of a damaged magnetic stirrer motor. Symptoms: The measured value of all specimens is extremely unstable and fluctuates. Failure analysis and inspection methods: The measured value is not stable and is related to the insufficient mixing of the specimen and the reagent pool. First of all, the sound of the magnetic stirrer motor could not be heard near the instrument and the magnetic block could not be seen. According to the electrical schematic diagram (see Figure 1), the control signal of the stirring motor sent from the CPU is directly driven by the IC8 (DP8311N). When the output of pin 11 of IC8 is “O”, the motor runs; the output is