I'm assuming that you installed the head-unit new and that the faceplate did (at one time) previously slide down the way it was intended to work - is this assumption correct?
Is the molding around the head faceplate (mounting ring) damaged?
Are you sure you're not using the semi-permanent mounting configuration??
(see page 6 of the
manual)
This particular unit has the option for a semi-permanent mounting of the face plate. If the two screws are inserted into the sides, it will lock the face plate in to the head unit (have you done that?) - if so, removing the screws will allow the face plate to be removed.
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