After I ring out a item and sub total. the cash button wont work it just beeps and says
REQ. E/T/D func.

Rupa, February 2010

I have never seen this error before. It sounds like this register may be looking for an EFT terminal. Do you have it connected to a debit/credit card processing machine? Also, does it happen if you pay for a sale with another payment button, check, credit etc?

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Looking for Samsung ER-650 manual?
http://the-checkout-tech.com/manuals/cashregisters/samsung1.php

Mark, February 2010