Mu sharp xe a 202 register will not turn on. ?

I have never seen a dead 202. Therefore, I'd have to say there is probably a very good reason for your machine to die. Check for contamination on the main pc board for a start. Secondly, there may be a thermal interlock fuse inside the power transformer. This usually fails during a power surge and requires replacement of the transformer. It is very rare to find a basic glass fuse in registers so I would say you need to get it to a dealer.
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If anyone is looking for a Sharp XE-A202 cash register manual, go here:

http://the-checkout-tech.com/manuals/cashregisters/Sharp10.php

Registerman
June 2010