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How can I fix Sharp ER-330 Cash Register?

Our Sharp ER-330 Cash Register shows 0.00 in display, but does not respond to any pressing of the keys, and does not ding when press keys. As a result the cash drawer does not come open either. How can this be fixed?
Audie, June 2015
Do you mean an ER-A330?
Does it beep if you press CL (clear button)?
Can you see numbers on the display if you press the numeric buttons?

Registerman, June 2015
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