UM9彩色超声多普勒诊断仪，俗称超九，是美国ATL公司于80年代末期开发研制的超声波诊断仪。该仪器以其优秀的图像质量在中国的医院市场上占据了较大的份额。随着使用时间的推移，其维护与修理的问题就摆在了我们面前。针对该仪器的故障特点，现将其最常见的启动故障论述如下。 UM9 color ultrasonic Doppler diagnostic instrument, commonly known as ultra-nine, is an ultrasonic diagnostic instrument developed by American ATL company in the late 80s. The instrument occupies a large share of the Chinese hospital market with its excellent image quality. With the passage of time, the problems of its maintenance and repair are before us. For the fault features of the instrument, the most common startup faults are discussed below.