论文部分内容阅读
例一:故障现象星王CVK—1720L型VCD机,有时接通电源后,循迹电机即将激光头送至机芯的外沿并且无法停止,导致循迹中介齿轮“跳齿”而发出“哒哒”声,主轴电机不转。分析与检修根据现象分析,一般为循迹电机驱动电路故障或者有虚焊,检查循迹电机驱动集成块及其外围元件均正常,更换驱动集成块后故障依然。拆下机芯仔细观察,发现机芯上的激光头停机到位开关焊点间有异物,造成开关轻微漏电,致使驱动集成块认为激光头还处于初始状态,便输出+5V电压使激光头送
Example 1: Symptom Star CVK-1720L VCD machine, sometimes connected to the power, the tracking motor is about to send the laser head to the movement of the outer and can not stop, resulting in tracking gear “jump” and issued a “da Da ”sound, the spindle motor does not turn. Analysis and Maintenance According to the phenomenon analysis, it is generally the fault of the tracking motor drive circuit or the virtual welding. The inspection tracking motor drive integrated block and its peripheral components are normal, and the fault remains after replacing the drive integrated block. Remove the movement carefully observed and found the movement of the laser head shut down in place there is a foreign body between the solder joints, resulting in a slight electrical leakage switch, resulting in driving the manifold that the laser head is still in its initial state, it will output + 5V voltage to the laser head to send