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故障现象:无图像、有伴音,光栅呈灰暗色且有十余根淡淡的回扫线,字符显示正常,但偏色。检修:该机为久修未果的转修机,检测显像管各阴极电压,发现均偏低于正常值30～50V左右,用手触摸各视放管180V供电限流电阻发烫,但各视放管及外围元件并无明显损坏现象。经检查,发现各级视放均出现过流现象系前维修者已将视放电路的工作点调乱所致。于是,先对本机的亮、暗平衡进行调整,但故障依旧,可见故障点并不在末级视放电路。测量视放板与主板相连接的排插座XSP各端电压:①端亮度信
Symptoms: no images, accompanied by sound, light gray grating and more than ten faint echo line, the characters show normal, but color cast. Overhaul: This machine is a long repair unsuccessful repairing machine, testing the CRT cathode voltage, were found below normal about 30 ~ 50V or so, the hands touch the various tubes 180V power supply current limiting resistor hot, but the video player No significant damage to the tube and peripheral components. After examination, it was found that the phenomenon of over-current at all levels of video appeared before the maintenance department has put the operating point of the circuit as a result of chaos. So, first of all, the machine’s light and dark balance to be adjusted, but the fault remains the same, we can see the fault point is not at the final circuit. Measuring plate and the board connected to the motherboard socket XSP voltage: ① end of the brightness of the letter