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ER5100 Samsung Cash register issues, how do I fix the problems below?

Hi, I have just bought a 2nd hand ER5100 and in the process of inputting preset prices on various keys and progressing well, But, I've noticed the no-sale key doesnt open drawer and 8 and 9 on keypad occasionally dont register, do I need to clear something?
Bill Muir, March 2012
If keys only work sometimes such as 8 and 9, you have a faulty keyboard.

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If anyone needs more information, the Samsung ER-5100 programming manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung2.php

Registerman, March 2012
link Click here to see other fixes for Samsung ER5100.