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Full Version: 15C square root key loose - problem?
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I just got a HP15C off Craigslist. It is basically new, except the keys on the left top are looser than the rest. The square root key is most noticeable. It has a lot more movement than other keys before there is any resistance. Hold the calculator upside down and tap the square root key, and it will rattle. Is this keyboard faulty, with a broken heat stake or something? Do other 15Cs feel this way?

Mike

The heads (mushrooms) of the heat stakes have failed. If the unit is in great condition, the problem was a manufacturing issue and you're likely to find with just a light touch on the other mushroom heads that they'll just pop right off. I've seen units where every heat stake had failed except for the bottom. If the unit has been well used, the popped heads are due to stress failures.

The generally accepted repair method is to hold the board tightly in place and place a very small amount of super glue on the post. Follow that with drop or two of instant cure and move to the next post. You can also use rubberized super glues, they're flexible, black and work well in this application.

I cannot over emphasize the *small amount* disclaimer above. Too much and you'll glue the key hinge, seizing the key and turning your great find into a paperweight.

Two heat stakes fixed with super glue and I have a new HP-15C! Thanks FixThatCalc