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故障现象三开机指示灯亮，荧光屏上无任何显示，调节亮度电位器无效。分析与检修荧光屏上无任何显示应先检查显像管CRT的各极供电情况，从图纸上看CRT的各权供电是由UP－6757电路板产生，打开机盖从机器的正面看，在机器的左侧找到该电路板。开机测量十85V、＋4O0v直流电压无，
Symptom 3 The power-on indicator is on. There is no display on the fluorescent screen. Adjusting the brightness potentiometer is invalid. Analysis and maintenance without any display on the fluorescent screen should first check the power supply of the cathode of the CRT. From the drawing, the power supply of the CRT is generated by the UP-6757 circuit board. Open the cover from the front of the machine, on the left side of the machine. Find the board on the side. Start measurement of 85V, +4O0V DC voltage,