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开机光栅即频频闪动无规律,由灰到亮再变灰,喇叭里有轻微的跟随反映,节奏很慢。经检测主电压110V和行整流190V均正常,测显像管各极电压时,发现灯丝电压微微变动,查行输出变压器⑨脚交流电压无变化,表笔一碰R_(557)其一端光栅反映很大,换新的电阻后,该机工作正常。而又有一台同机型同故障,只是
Frequent flashing boot that irregular, from gray to light and then gray, the speaker has a slight follow-up reflects the slow pace. After the detection of the main voltage of 110V and line rectification 190V are normal, the test tube voltage of each pole, found that the filament voltage changes slightly, check the line output transformer ⑨ pin no change in AC voltage, the pen touch R_ (557) one end of the grating reflects a lot, After a new resistance, the aircraft is working properly. And one with the same type of fault, just