Re: 71b history question Message #2 Posted by Kim on 27 Apr 2003, 3:21 a.m., in response to message #1 by db(martinez,california)
I'm guessing here
Most changes are driven by either customer satisfaction
or cost (sometimes both).
The Metal back is there (at least - maybe other things as well) as part of the ESD sandwich.
I read in some previous material that they ZAP(ed) something like 15kV through calcs and they have(had) to survive that (in running mode), undisrupted.
However the metal is vulnerable for scratches and dings more than the plastic and the process of mounting and miniscrewfixing is cumbersome (some of us tried loosing (and hopefully finding) some of the nuts, bolts (if they are called that at 1mm) spacers etc.) imagine the repaircenter guys.
I have not looked in a plastic back, but I would expect to find a sheet against the inside bottom of the 71 replacing the metal.
So in short - I assume cost reduction and cosmetics.
Kim
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