激光头是CD、VCD机的核心元件,同时又是价格最高的易损元件。其故障率较高,一旦损坏,只有更换新件才能修复。激光头老化,若通过调整可调电位器无效,亦应更换新的激光头。目前市场上激光头型号繁多,质量优劣并存,甚至一些废旧激光头也当作新激光头出售。由于激光头只有装机才能试验,且一般销售商对售出的激光头不包退换,这些都给选购激光头带来不便。那么,怎样选购激光头呢?选购激 Laser head is CD, VCD machine’s core components, but also the most expensive components vulnerable. The failure rate is higher, once damaged, only to replace the new pieces to repair. Laser head aging, if by adjusting the adjustable potentiometer is invalid, should also replace the new laser head. Currently on the market a wide range of laser head, quality advantages coexist, and even some of the old laser head is also sold as a new laser head. As the laser head can only be installed to test, and the general sales of the laser head sold are not returned, which are not easy to buy the laser head. So, how to buy a laser head it?