Hi.
It probably needs resetting. It's hard to get manuals now and Casio don't let me distribute them. the-checkout-tech.com has one available and it's cheap:
Preview of manual:
http://the-checkout-tech.com/manuals/TOC/cashregisters/Casio/CE-3700_operators_and_programming.TOC.pdf
Full manual:
http://the-checkout-tech.com/estore/catalog/advanced_search_result.php?keywords=CE-3700_operators_and_programm&x=0&y=0
If you get a manual, I can guide you through any parts of it that you don't understand.
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