The key is not supposed to open the drawer. It is used to lock or unlock it, but not open it. There is a trigger under the drawer between the back two feet that should be used to release the drawer tray during a power outage. If the trigger does not work, then you have a jammed drawer or faulty mechanism.
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If anyone needs / looking for a Sharp XE-A102 manual,
http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A102_operating_and_programming_manual.html
Registerman, August 2010
