ＳＪＮ—2200型Ｂ超是无锡海鹰集团的产品,可配用35ＭＨｚ,5ＭＨｚ两种线阵探头,可以获得较好的诊断图象,价格低,在基层医院有较高的普及率,现把该机的三例维修经验介绍给广大同行供参考。故障现象一:开机后,电源指示灯亮,监视器无光栅,但开、关瞬间,监视器能闪开。故障分析与 SJN-2200 type B ultrasonic is the product of Wuxi Haiying Group. It can be equipped with 35MHz, 5MHz two linear array probes, which can obtain better diagnostic images. The price is low, and it has a higher penetration rate in grassroots hospitals. The machine’s three cases of maintenance experience were introduced to the majority of their counterparts for reference. Symptom 1: After powering on, the power indicator light is on and the monitor has no light barrier. However, the monitor can be turned on immediately after turning on and off. Failure analysis and