HP35s key action problem


I just got my brand new HP35s. First impression is that this is a really great calculator for the price tag. Looks great, the display contrast is good, and I love the case that comes with it!

I'm working through the manual and liking what I see so far.

However, I have one key, the '+' key, that I really have to press in order to get it to register. I don't have to stand on it, but I can definitely press it without getting a function. I have to press it just a little harder than the other keys. It wouldn't be quite so irritating if it weren't such a frequently used function.

Has anyone else noticed other keys having this trouble on the HP35s?



The 35s seems to have a high percentage of units with keyboard problems. This has been discussed/complained about at great length here.

My first one had a keyboard that randomly failed to register keystrokes. HP replaced it with another unit, and after about a month, it too is failing to register keystrokes.

I recommend complaining to HP and trying to get a replacement. The 35s would be a nice calculator, but the keyboard is unreliable.
It would seem that a reliable keyboard should be the foundation of a good calculator. If it can't reliably register keystrokes, what good is it? I doubt that I will ever buy a new HP product ever again.

HP, are you listening?


I too had problems with keys not registering, got HP to replace it under warranty. The replacement calc has a soft gold shift key but it registers correctly. Funny thing is an HP project manager was interviewed in a engineering magazine about the 35S and one thing he bragged about was the keyboard quality.


I had trouble with several keys out of the box, but pressing them down hard, and moving them back and forth seemed to fix it for me.

Possibly Related Threads…
Thread Author Replies Views Last Post
  HP35s Program Four Slings Lift Calculation Jean-Marc Biram (Australia) 2 2,209 12-16-2013, 07:21 PM
Last Post: Jean-Marc Biram (Australia)
  HP35s Calculator Max Rope Tension Program Jean-Marc Biram (Australia) 10 4,378 12-12-2013, 12:03 AM
Last Post: Jean-Marc Biram (Australia)
  Trouble entering a HP35s program line Arno 2 1,536 04-05-2013, 06:28 PM
Last Post: Arno
  HP35s scientific calculator GREG W THOMAS 4 1,913 03-22-2013, 06:49 AM
Last Post: Thomas Radtke
  HP35s "MEMORY CLEAR" flashes Mark Paris 1 1,490 08-31-2012, 07:35 PM
Last Post: Bart (UK)
  HP35S keyboard Nick R 8 2,810 08-01-2012, 01:27 PM
Last Post: Dave Shaffer (Arizona)
  [WP-34s] Key-debouncing problem? Daniel Vollmer 5 1,665 04-11-2012, 02:47 PM
Last Post: Neil Hamilton (Ottawa)
  Where should I post new HP35s bugs Andres Capdevila 33 9,339 03-13-2012, 01:00 PM
Last Post: Jeff O.
  HP35s Internal Investigations - new processor? stefan 5 2,070 03-08-2012, 04:48 AM
Last Post: Paul Dale
  Is the HP35s reliable? Chris Smith 26 7,176 02-24-2012, 11:38 AM
Last Post: Jeff Johnson

Forum Jump: