|Re: Lost key bounce (Pioneer)|
Message #7 Posted by Paul Brogger on 17 Jan 2006, 5:30 p.m.,
in response to message #1 by Eduardo
I've repaired a few Pioneer keyboards.
I disassemble, including the PCB (though I think you may leave the LCD in place). I've shaved off the tops of all the heat stakes hodling the metal backing plate to the front of the calc. Then, either clean the sandwich layers or replace them with parts from a disposable (algebraic, business, etc.) model. On one, with worn contact material in the mylar domes, I re-inked the dots with a conductive ink pen. (I don't have much experience with actually using it, so I don't know how long the ink adheres . . . )
Then I've just pressed the sandwich back together and re-melted the remaining portions of the heat stakes with a very pointy soldering iron. Enough plastic is forced out to restore the attachment.
But again, I don't have any long-term experience with actually using these restored keyboards, so your mileage may vary. But the keyboards did, in fact, work. And with fully-replaced layers, they should be almost as good as new.