no disk故障分析及排除（Not disk故障分析及排除）.docVIP

no disk故障分析及排除（Not disk故障分析及排除） The video NODISK failure analysis and troubleshooting 2001-08-05 The NODISK fault is: when the disc into the machine to check, display the NODISK English characters on the display screen, then the machine is crash, only import disc (EJECT) key to work. That is to say: when the machine has such a failure, only disk can access and other functions all lost. The failure in the DVD machine belongs to the common faults of the involved range is relatively large, which brings great difficulties to maintenance personnel. In a considerable number of maintenance personnel, which often have a feeling of awe, at a loss. Now the author summarizes in the maintenance, writing this fault for rough analysis, for reference. A DVD of the tracking and analysis process After the DVD boot, the first self control system. In the self inspection system after normal, then a tracking command tracking. If the machine piece, it shows STOP, or display NODISK, and then the machine comes to a halt. The stop condition although it is one of the working status, but in a sense it can be said is a kind of protective measures. Learned from the exploration and Research on the process of tracking of VCD, DVD tracking process can be divided into two steps: first, tracking search mode. This process is mainly composed of a laser head light detector for the photosensitive tube, tracking information read skew detection tube and relevant circuit is completed, its main role is whether there is a CD detection machine. Second, the tracking program directory. The photosensitive tube and relevant circuit the process mainly consists of optical detector reads the video information is completed, its main function is to read the disk catalog. When the two process completely at the end of the control system inside the machine to confirm the machine has conformed to the standard format (such as CLV, CAV, CD, CDV) of the disc, and to be put into the state. The actual mechanical action steps a