|Re: HP28S Case change|
Message #4 Posted by Tony Duell on 27 June 2001, 7:06 p.m.,
in response to message #1 by GE (France)
My guess (without trying it) is that the 19B case and the 28S case are the same mouldings (albeit in different colours normally). The problem is actually getting the machines apart without
wrecking the cases.
HP heat-staked these machines together, and didn't intend them to be dismantled or repaired (thanks HP :-(). If you really want to take one
apart, peel off the overlays over the keyboards and above the display, and drill off the tops of the heat-staked studs.
Use a 3mm or so twist drill bit held in your fingers (or a large pin chuck), not in any kind of hand or electric drill. Do not drill too deep.
The machine will then come apart. You can then swap over case parts and either melt the ends of the studs with a soldering iron to keep it all together, or use
glue (epoxy resin, probably). But it won't be as strong as the original machine.
I've taken apart most series of HP calculators, and these are _the worst_ to get back together. With the later machines
(Pioneers, etc), you still have the heat-staked studs, but they just hold the back cover on. The machine will work if you just clip the back in place. With the Clamshells, the studs hold the keyboard together, they hold the
keyboard flexiprint against the logic board, and so on. It's essential to get at least some of them firmly staked for the machine to work at all.
Personally, I might try something like this, but only to show it can be done, not for a machine that I actually depended on.