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故障现象:机器预热档正常,但当开关拨至治疗档时(即送上高压),毫安表指针急速打到头且不受调,机内有异常“吱”声,保险当即熔断。故障检修:DLG-2型超短波电疗机是电磁耦合、调屏调栅推挽振荡式高频治疗机,其电路如附图所示。换上保险丝,打开机器盖重新开机,见整流管伴随着“吱”声发出强烈的蓝光。V_2V_4可见屏极有熔化物脱落。
Failure phenomenon: The machine warms up the file normally, but when the switch dials to the treatment file (that is, sends the high pressure), the milliammeter pointer quickly hits the head and is not adjusted, the machine has an abnormal “click” sound, and the fuse is immediately blown. Troubleshooting: The DLG-2 ultra-shortwave electrotherapy machine is an electromagnetically coupled, screen-adjusted, grid-push-push, oscillating, high-frequency therapeutic machine. Its circuit is shown in the attached drawings. Replace the fuse, turn on the machine cover, and turn it back on. See the rectifier tube emitting a strong blue light with a click. The V_2V_4 visible screen was extremely melted.