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故障现象：Ｆ７８—Ⅱ３００ｍＡ诊断Ｘ线机Ｉ台透视正常，但Ｉ台点片和ＩＩ台摄片时高压指示灯不亮，无Ｘ射线产生。分析及检修：首先拆下Ｉ台Ｘ线管窗口滤线铝板及高压初级接线Ｖ１Ｖ２，接通电源观察球管灯丝，并转动大，小焦点灯丝切换开关，大、小焦点灯丝燃亮正常。...
Symptoms: F78-Ⅱ 300mA X-ray machine I diagnosed normal perspective, but the I-point and II sets of high-pressure indicator when the film does not light, no X-ray generation. Analysis and Overhaul: First, remove the I-line X-ray tube window aluminum and high voltage primary wiring V1V2, turn on the power to observe the tube filament, and turn the large and small focus filament switch, large and small focus filament lit normal. ...