NP-41 Emulator (may be)

[Helix]

(12-20-2017 08:36 PM)Egan Ford Wrote:  

(12-20-2017 06:43 PM)Massimo Gnerucci Wrote:  Not a lemon, but the "9" key didn't register at all. I pushed it down as far as I could and things have improved a little but it is still worse than others.

I have similar problems with the LN key. I press like any other key. I hear the click, but the key does not register. If I press a bit harder, then it registers.

My "X" (times) key didn't work at all until I pressed it hard a few times. Now it appears to work like the others. Same trick didn't work for LN, still needs a just a bit more relative force.

About keys not registering correctly, I experienced the same problem with my two NP-25 units, which share the same keys. At reception, the calculators worked perfectly, but after several months one or two keys didn't work well anymore, and required a very firm press. I use my NP-25 occasionally, and I store them in a zip plastic bag so they are protected from dust.

It's not easy to explain what I did in English, but I will try :
I have pushed the faulty keys alternatively towards the top and towards the bottom of the PCB, with the hope to produce some lateral movement underneath that would remove some dust or some other imperfection.
I have also introduced the tip of an extremely fine knife, between the side of the white key and its mount, here again alternatively on the upper side and the lower side of the key. I am pleased to report that the defective keys on my two NP-25 work now as expected.
Maybe this can solve some NP-41 key problems.