|Re: The decline of Soviet calculator quality|
Message #3 Posted by bhtooefr on 31 May 2013, 8:26 a.m.,
in response to message #2 by Cristian Arezzini
That makes sense - the key technology they're using, it seems, is a metalized mylar snap dome for tactility, and a foam sheet for springiness (I think, anyway).
If that foam sheet has degraded, the mylar dome may be partially collapsed under the weight of the key, and there'll be no travel whatsoever. And, when it IS a case of the foam sheet being collapsed, turning the calculator upside down should reveal that quite easily, and tactile feel may even return when it's upside down. (If the mylar domes are degraded, though, then that may not work.)
My MK-61 was made in 1991, and feels fine. Not GOOD per se, but it works reliably and it feels better than, say, most TI calculators.