How to open a Casio FX-4000P?

[johanw]

(08-08-2021 10:17 AM)vaklaff Wrote:  Great idea, thanks for sharing!

I have to admit I had difficulties getting it to stick, but I managed by dipping the screwdriver in S39 and wetting the inside of the screw with it too. Of course I was careful not to get that stuff onto the pcb.

Quote:As for the technique, nothing complicated. Most of screws in calculators are very soft

I tried it with a small, sharp philips screwdriver and pressed quite hard, that gave enough grip to get them loose. 2 new CD2032 batteries and the machine switched on immediately.

I didn't even have to tune up the contrast (is that even possible on a 4000? I didn't see any keys for that) as was the case with my FX-8000G, when I replaced the batteries in that one my heart sank when I didn't see anything when I switched it on, until I got the idea to push up the contrast. That worked.