故障现象一:一开机,显示屏上所有字符与波形稳定不住,向右跑动。故障分析与处理:从屏幕现象可看出,这可能是行同步频率超出同步范围所致。打开机盖,仔细观察主板上有一可调节电位器ＡＩＲ21,此电位器即行同步频率范围调节电位器,可用来调节行同步范围,用一细长一字螺丝刀小心调 Symptom 1: When the camera is turned on, all the characters and waveforms on the screen cannot be stabilized and run to the right. Fault analysis and processing: As can be seen from the screen phenomenon, this may be caused by the line synchronization frequency exceeding the synchronization range. Open the cover and carefully observe that there is an adjustable potentiometer AIR21 on the mainboard. This potentiometer is the line synchronization frequency range adjustment potentiometer, which can be used to adjust the line synchronization range. Carefully adjust with a slender flat-head screwdriver.