If you can't figure out how to do this, I would think twice about taking it apart. If they didn't include that info in the manual, it may be difficult.
If you are in a situation where your have no choice, then try the following. I'm pretty sure that your CD-5 is made out of aluminium and you can't see any screws when you look at the unit. You probably have to flip it over and start there. Either the bottom will come off and that will allow you to access the screws that hold down the top plate, from the inside; or. If its not done that way, still flip it over. There may be threaded rods that you access from the bottom and that is what holds the top in place. You may have to remove the feet to find them. If not under the feet, then most likely the rods will be in the corners.
If you are in a situation where your have no choice, then try the following. I'm pretty sure that your CD-5 is made out of aluminium and you can't see any screws when you look at the unit. You probably have to flip it over and start there. Either the bottom will come off and that will allow you to access the screws that hold down the top plate, from the inside; or. If its not done that way, still flip it over. There may be threaded rods that you access from the bottom and that is what holds the top in place. You may have to remove the feet to find them. If not under the feet, then most likely the rods will be in the corners.