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Manufactured in 1985, this electronic calculator has a 10-digit display and closely resembles the TI-5140 that has a 12-digit display.

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Why doesn't my = key work?

I can add and subtract all day, but my equal key = does nothing except easily press down and pop back up. The machine worked last week, so I'm stymied.

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check if there is a short, to do that, use a voltameter, if it works, check if the key is seated properly.

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