Does anyone here know anything helpful regarding opening an hp32sii
calculator to fix mushyness?
Yes, don't :-)... You may think that;'s rather odd coming from me. but
these machines are painful to work on, and not as well made as I would like.
OK, if, like me, you're not easily put off, the first problem is getting
inside. These things are heat-staked together of course. THe t parts of
the case are staked together, the keyboard membrane layers and a metal
backing plate (which also carries the display glass) are staked to the
Remvoe the batery cover and the button cells. You can see 4 stakes inside
the battery compartment, Drill out the tops of those using a 3,5mm or so
twist drill. THe other 4 stakes are at the front edge on the top
(keyboard) side, under the metal trim. Soem peole 'rip' the machine apart
at this point, my worry is that this is likely to damage the stakes
holfing the keyboard together. Others (including me) carefully take off
the metal keyboard bezel (don't crease it, it's impossible to flatten it
again) and then drill the tops off those stakes too,
With the case open, undo the 6 twist tabs on the PCB and thake the latter
off. You cna now see the back of the keybaord with numerous heat stakes.
Often, some of these are broken, which may be the fault you are looking
for. You might be able ot melt soem more plastic rod onto the remains of
the old stakes with a soldering iron to improve matters.
I do not recoemnd cutting off these stakes and taking the keyboard apart.
You will not get it stay together again. I took apart a scrap one to see
how it was made and to trace out the keyboard matrix (this was a 42S
IIRC, with a very dead CPU), that's the only time I'd contemlate doing this.