故障现象 踩下照相脚踏开关,屏幕变暗,所拍照片变成全黑。 分析与检修 根据故障现象。可判断故障范围在与照相有关的电路上、由该机原理图可知.照相 Symptoms Depressing the photo pedal switch darkens the screen and the picture taken turns black. Analysis and maintenance According to the phenomenon of failure. The fault range can be judged on the camera-related circuit, which is known from the machine schematic.