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例1.故障现象:碟片入仓约5s后,屏显“NO DISC”,操作任何键均不起作用,托盘出入正常。分析检修:打开机盖,观察发现入仓后碟片不转,但激光头能上下正常移动,约5s后,屏显“NO DISC”,操作其它键不起作用。该机正常时,碟片入仓后激光头聚焦线圈产生上下聚焦动作,激光束由物镜照射至碟片上以拾取信号,该信号通过物镜返回激光头光敏组件,读出光信号并转变成电信号,通过射频放大器
Example 1. Symptom: Disc storage for about 5s, the screen display “NO DISC”, the operation of any key does not work, the tray into and out of normal. Analysis and Maintenance: Open the lid, observe the disc does not turn into warehousing, but the laser head can move up and down normally, about 5s, the screen display “NO DISC”, the operation of other keys does not work. When the machine is normal, the laser disc focuses the coil to generate the focusing action when the disc is in stock, and the laser beam is irradiated onto the disc by the objective lens to pick up the signal. The signal returns to the photosensitive element of the laser head through the objective lens to read out the optical signal and turn it into electricity Signal through the RF amplifier