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One key is not returning to it's raised position; no key action.

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Depending on what instrument this is, CHECK that the front of the key is NOT contacting the case and dragging.

Some instruments use a silicone rubber dome that contains conductive rubber "pills" that are pressed onto circuit traces for contacts. In these cases, OFTEN the silicone rubber acts as the resoring spring and if it is damaged can cause your problem.

Yet another scenario is that a plastic "hinge" that the key pivots is broken.

You have to open the instrument to analyze and the cause will probably be obvious once you do so.

Posted on Nov 15, 2009


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