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sharp er-4230 frozen. how do i fix?

cashier unplugged register during a transaction. I am unable to continue using it. The screen appears to be frozen.
cc, September 2011
That normally would not lock up a cash register. I haven't got any info on this as it is a very old model.

This may be helpful:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-4230_instruction_manual.html

Registerman, September 2011
link Click here to see other fixes for Sharp.