Is there an internal fuse?

Bryan, May 2011

There is but it doesn't normally blow, so I'd look for a good reason such as a serious power surge or liquid damage. The 212 is VERY reliable.
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If anyone needs more information,
the operating and programming manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Sharp11.php

and the Service (repair) manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_XE-A212_service_manual.html

Registerman, May 2011