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7本机是日本光电公司生产的，机中共有8个插件槽，可以插入各种功能的插件，使用比较方便。现将几次维修过程介绍如下：故障一监视屏上第一路信号无显示。观察分析：在开机两分钟内显示正常，以后显示波形被分断切割，切割部分被拉到一固定位置，随后切割部分逐渐增多，直到最
7 This machine is produced by Japan Optoelectronics. There are 8 plug-in slots in the machine. It can insert plugs of various functions and it is convenient to use. Several maintenance procedures are now described as follows: Fault No. 1 on the monitor screen No signal is displayed. Observe and analyze: The display is normal within two minutes after power-on, and the displayed waveform is broken afterwards. The cutting part is pulled to a fixed position, and the cutting part is gradually increased until the most.