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故障现象:主机观察用外监视器。开机工作数分钟后,屏幕图象变暗,直至变黑,关机停几分钟后,再开机能工作一会。屏幕再次出现全黑,反复多次直到不能工作。分析与检修:由于外监视器与摄像、录像取自同一个视频信号,摄像用内监视器,工作一直正常。因此初步分析该故障可能出在外监视器内部或视频信号输入回路。检查外监视器显像管灯丝亮,电源电压12伏,正常,而用放电法检查高压没有拉弧放电,估计高压变压器输出有故障,但进一步分析,该监视器为随机光栅
Symptom: Host observation with the external monitor. After a few minutes of power-on, the screen image becomes dark until it turns black. After a few minutes of shutdown, it can work for a while after powering on. The screen appears all black again, repeated several times until it can not work. Analysis and Maintenance: Due to the external monitor and video recording, video taken from the same video signal, camera with the monitor, work has been normal. Therefore, the initial analysis of the fault may be outside the monitor or video signal input circuit. Check the external monitor CRT lamp filament light, the power supply voltage of 12 volts, normal, and discharge method without high voltage arc discharge is estimated that the high-voltage transformer output is faulty, but for further analysis, the monitor is a random grating