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Bought a Sigma TR7112 calculator about 8 months ago, used a few times then, but haven't used it recently. Have been trying to make it work for the last two days, even left it on the windowcil in daylight, no luck. Any suggestions? It has hardly ever been used.

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The same thing happened to mine. Although it's dual power if the battery dies it won't work. Unscrew the back off the calculator and you will see a flat button battery, replace it and it will work again.

Posted on Mar 27, 2014

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