Yeah I know. Sounds like a really insightful article.
Well I’ll get straight to the point. Just recently I fixed my daughters old DVD player. For the life of me I couldn’t figure out why it had suddenly stopped working. It had for a long time began to shake when the player would turn on but eventually it would even out and play the disk. It finally stopped working when we needed the player for a long car trip. We tried cleaning the laser with alcohol and made sure that there was no debris around the laser. Still nothing seemed to work. We ended up just buying a replacement unit for the trip.
It wasn’t till a few months later that I wanted to take a closer look at the DVD player. I figured that the shaking unit could be caused by some kind of imbalance. If the disk wasn’t properly balanced the laser would not be able to read the disk properly. I checked the connecting points on the part that holds the disk in place. Everything seemed to look good. However when I began to spin the disk holder I noticed small screws underneath it. It was there that I discovered that a tiny screw was loose. I tightened the screw and the player began to work again. It seems to shake (as before) and I think it may have lost a few tiny screws in the years that it had been used. When the disk holder is rotated a bit more there were three holes next to the laser. Two of them looked like they had wear around the threads. It leads me to believe that those holes may need to be screwed in to prevent further shaking.
I hope this article helped you!