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我院一台ALOKA SSD—280型B超仪,突然出现监视屏无显示、照相屏也无显示且光栅变暗黑的故障。我们根据有关线路资料进行了检修。从总体框图知数/模转换输出信号是从EP—1808板到视频分配器板EP—1820再到各显示器的。因此,首先测试去监视器的信号,发现无输出,故可先排除监视器故障,再查视频EP—1820板的POSIIN输入脚J_(301)也无信号输入,又根据EP—1820线路图知:VTR IN,VTR OUT与POSIIN,POSI OUT二线路设计,集成块及外围
In our hospital, an ALOKA SSD-280 B-mode ultrasonographer suddenly appeared with no display on the monitor screen, no display on the camera screen, and a darkened grating. We conducted overhaul according to the relevant line data. From the overall block diagram, it is known that the digital-to-analog conversion output signal is from the EP-1808 board to the video distributor board EP-1820 to each display. Therefore, first test the signal of the monitor and find that there is no output, so we can first eliminate the monitor failure, and then check the POSIIN input pin J_(301) of the video EP-1820 board without signal input, and according to the EP-1820 circuit diagram. : VTR IN, VTR OUT and POSIIN, POSI OUT Two-Line Design, Integrated Block and Peripheral