Most fuses are 20mm in size, they also come in surge and quick blow. If in doubt go for the Quick Blow type. However fuses tend to blow if there is an overload. Often caused by a shorted power amp transistor or device. If the fuse goes again then you have a short somewhere.
the little motor band is faulty try to hit 2 or 3 times on top when you are pressing cd open
tip dont hit too hard and and pay attention if you can ear the tiny motor running trying to open tray