Key bounce problems with the HP 15c LE

[Michael de Estrada]

I've been experiencing really bad key bounce problems with my HP 15c LE calculators. I have two of them that I've been using regularly that came from totally different manufacturing batches, and they both do this constantly. It does not seem to be confined to any particular keys or section of the keyboard, and I'm at wits end with them. I'm wondering if this is some mechanical design problem or perhaps just a bad internal keytime choice in the firmware. I know that it is possible to increase the keytime in my HP 50g to avoid key bounce, but AFAIK there is no way to change this in the HP 15c LE w/o a firmware update, which is very unlikely to ever take place. It's really a shame, because I bought these calculators to save wear and tear on my original Voyager HP 15c, but they are practically useless with this behavior.