That's quite a bit of info you need.
It's mostly done by codes on this model so you need to use codes from the manual, especially when programming. I usually point people to checkout tech. They have the best Sharp range
https://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-A330_instruction_manual.html
SOURCE: Sharp er-a330 cash register prob'
The Sharp ER-A330 and ER-A310 both have a calculator function that turned out to be just trouble for users who don't need it and don't know how to turn it off. At the bottom-left of the keyboard is a button labeled PO. Normally you enter a dollar amount and touch that to Pay Out money from the till. On these models it also activates the calculator mode, allowing you to add and subtract numbers without affecting sales.Touch PO to turn calculator mode back off, and you'll have a cash register again.
Let me know if this isn't the fix you need.
SOURCE: how do reset grand totals for sharp cash register ER-A330
Please refer to your owners manual.
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