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第一例故障现象 DYI—1型电泳仪无电压、无电流输出。分析检修:开机后指示灯不亮,取下保险丝管,发现已烧断,更换后仍断。怀疑电源电路有毛病。打开机器,拔出5z 4 P 整流管,用万用表测量高压绕组,其中—组只有几个欧姆,说明该绕组烧坏短路,将变压器拆下重绕即可解决问题。考虑到该变压器绕组多,高压组又是对称抽头,体积大,可设法改掉该机的供电电路。方法如下:把高压部分改为倍压整流,输出为750伏,电子管灯丝电医采用输出为6.3伏。2安以上的变压器供给(可用市售6伏12瓦以上的变压器代用),装在一小块胶木板上接入电路中即可。
The first case of symptoms DYI-1 electrophoresis instrument voltage, no current output. Analysis and maintenance: indicator light does not turn on, remove the fuse tube, found to have been blown, still broken after replacement. Suspected power circuit defective. Open the machine, unplug the 5z 4 P rectifier, with a multimeter to measure the high-voltage winding, of which - group only a few ohms, indicating that the winding burnout short circuit, the transformer can be resolved by rewinding to solve the problem. Taking into account the transformer winding more, high-voltage group is a symmetrical tap, bulky, you can try to get rid of the power supply circuit of the aircraft. The method is as follows: the high pressure part is changed to double pressure rectification, the output is 750 volts, the output of the tube filament electroscope is 6.3 volts. More than 2 amps transformer supply (commercially available 6 volts and above 12-watt transformer substituting), installed in a small piece of bakelite access circuit can be.