if the face of the alpine is removable take it of, and on the extreme right and left sides of the deck there should be a little round thing.....flat with a small dimple in the center, if you move those to the center of the slot they move in the deck should come out (use a pen or something like that) If the face isn't removable take the trim ring off and you should be able to see what holds the deck in......a very small screwdriver inserted between the cage and the deck itself should release it try that , or let me know what you see when you remove the face or the trim ring