A scientific calculator by Sharp.

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How can I fix it?

MY calculator won't turn off except after being left alone for a long period of time and the buttons aren't responding. Also it only displays 0=. and I've even tried restarting it many times.

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Try replacing the battery and then resetting the calculator.

The EL-531X uses a LR-44 (or equivalent) battery

Here are two images that show what to do.

Battery Replacement

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(click on images to enlarge for better viewing)

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