Try releasing the drawer mechanism by taking the item to bits...often the drawer is held in by a spring loaded catch or similar. Also when the unit is open you may be able to free the tape enough to be able to the extract the whole cassette when the door is unjammed. If in any doubt, try a good local repair centre, but it will be much more cost effective if you can carefully take the unit to bits yourself, and the latest micro style ones aren't too bad; just don't strip out the threads by over-tightening as they use self tapping screws!
Jules, July 2004