故障现象 :开机后 ,技术选择置透视位 ,踏下脚闸开关Ｆ -ＯＮ时 ,监视器图像时有时无 ,此故障检修时有时图像又出现正常 ,故障反复出现 ,直至发展到无图像 ,透视无法进行。故障分析与检修 :从上述故障现象 ,结合电路分析。在闭路电视系统查无异常情况下 ,考虑故障有两种可能性 Symptom: After booting, the technology choice sets the perspective bit. When I press the foot switch F -ON, sometimes the monitor image is absent, and sometimes the image appears normal again during this trouble shooting. The fault appears again and again until it develops to no image, the perspective can not get on. Failure Analysis and Maintenance: From the above symptoms, combined with circuit analysis. In the closed-circuit television system no abnormalities checked, there are two possibilities to consider failure