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how do I fix a registration error on a sharp ER-A520?

my department keys are not working #1 thru #31
when you enter it says entry error but when I try to reprogram it says memory full can you help?
Maria, September 2010
I have a Sharp ER-A520 cash register. We have had is for 8+ years. Today it will not Z out and clear the total for the day. How do you get it to Z out without having an Entry Error?

Crys, May 2020
Make sure you do NOT use a decimal point when typing prices. If you receive a memory full error, then you have probably used all of the departments already. Try editing an existing one instead.
If you still have trouble, try to give more information on how you are using and programming the departments.

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If anyone needs a Sharp ER-A520, ER-A530 cash register manual,

Operating:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-A520_and_ER-A530_instruction_manual.html

Programming:

http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-A520_and_ER-A530_programming_manual.html

Registerman, September 2010
link Click here to see other fixes for Sharp.