shown here is an illustrated disassembly of an hp-32e
calculator, one of several spice models.
many thanks to tony duell for showing me how to do this.
the unit wont open because there is a catch inside the case at the
base. adopt the special grip shown here and push up with the thumbs and
pull back with the hands so as to pull the case twowards you.
now remove the back and put it aside.
take care here not to disturb the keycaps underneath. you might
like to make a keycap diagram before this stage incase some of the keycaps
fall out of place.
be careful not to lose the small metal on switch.
see here the circuit board. its a solderless construction held together
by two spring clips one down each side.
see here the main cpu (larger) and two small rom chips. some models
have a third.
the other board is the power supply.
re-assembly is easy. clip the spring clips back in place. maintain an
even pressure on the board to prevent the chips dislodging whilst you put
in place the second clip.