HP-15C LE Bad Button >>> easy fix


In a previous thread we saw HP-15C LE fixed, but I found that fix too complicated. So I decided to sacrifice my calculator and do it myself and I'm no good with such repairs.

I used only my Swiss army knife, a small screwdriver and two component epoxy glue.

Heat stakes are very easy to cut off flashing with the PCB - the plastic the are made of is somewhat soft, jelly like.

The offending key had a little white plastic ball - about 0.1mm diameter - stuck at the dead center of the metal dome - and I had to apply some force to remove it.

I can't tell more about the material of the "ball", it got lost somewhere in the cotton bud I used to take it off...

Reassembling was easy - PCB stood quite firmly even without heat stakes heads being glued - I tested it like that for a day. Eventually I put a little drop of the glue on top of the heat stakes and that way sealed them. I believe this is enough to keep it firmly in place.

A tricky bit is there are 3 little spiral springs abt 20mm long that are very easy to loose when opening the calculator.

It's working perfectly now - will see for how long ;)


Edited: 24 Nov 2011, 8:14 p.m. after one or more responses were posted


Many thank for the info:-)

did you take pictures of the work?

Could the plastic ball be a residue from manufacturing, or in other words: Is it of one of the materials used in the hardware?

Did you mail it (the info, not the piece) to Tim? This may be of interest for him;-)



Possibly Related Threads…
Thread Author Replies Views Last Post
  HP Prime: the drama of the Apps button, shutdown, formatting, nothing solves Davi Ribeiro de Oliveira 0 1,118 11-17-2013, 07:23 AM
Last Post: Davi Ribeiro de Oliveira
  HP Prime: the drama of the Apps button, shutdown, formatting, nothing solves Davi Ribeiro de Oliveira 1 1,361 11-16-2013, 11:26 PM
Last Post: Michael de Estrada
  ENG button (like Casio calculators) on HP Prime uklo 3 2,016 11-04-2013, 09:45 PM
Last Post: LHH
  How to create a touch button [HP Prime] uklo 1 1,240 11-02-2013, 02:03 PM
Last Post: Marcus von Cube, Germany
  An easy course in using the HP16c-wanted- Frank 4 1,901 10-29-2013, 11:50 AM
Last Post: Mark Hardman
  OT: Jeppesen E6B Wind-Easy Computer (Slide Rule) Eddie W. Shore 18 6,664 10-12-2013, 03:26 PM
Last Post: George Litauszky
  HP Prime touch button SanS 3 1,545 10-10-2013, 12:24 PM
Last Post: Han
  Bad Flash in HP Prime Han 11 3,272 09-27-2013, 12:38 PM
Last Post: Han
  OT - A lucky find - Busicom Handy-LE LE-120A Cristian Arezzini 2 1,838 09-26-2013, 04:43 AM
Last Post: Cristian Arezzini
  Low power warning for HP-15C LE and batteries Nick_S 1 1,415 09-16-2013, 09:34 AM
Last Post: Hans Brueggemann

Forum Jump: