HP25: Some Keys with bad contact


Does anybody know how to repair bad contacts. There are some keys tha we must use much pressure. Thanks for any inputs.


I have had some success with stuffing a couple or few long strands of stainless steel soldering brush(avail Radio Shack in soldering tools) up into the contact area (plated through hole directly below key on keyboard and moving around circularly while pressing some on the keys,getting the strands between the contacts and over the edge of the PTH. This process done several times has gotten keys working that have formally not, as it does manage to scrub the contact area. Suggest you not overdo it, but it's worth a try before keyboard teardown, or keyboard replacement. Good luck, Frank


Hi !

It is quite possible that the contact between the halves of the calculator is crimped because of a twist in the case caused by an impact. Open the calc and look with a magnifying glass the contact pins. They should be a little bit separeted like a fork. If not then use a small screwdriver head to separate them. Now they should have a better contact to the "pipes" at the oppposite half of the calc. (I mean the top and bottom halves, by no means saw your calc into two halves ;-).

Possibly Related Threads...
Thread Author Replies Views Last Post
  Bad Flash in HP Prime Han 11 1,768 09-27-2013, 12:38 PM
Last Post: Han
  Cheap hp32sii in bad condition on sale on Taobao Waon Shinyoe (China) 1 636 03-01-2013, 08:35 PM
Last Post: Raymond Del Tondo
  Bill Smithville NJ please contact me Don Shepherd 1 482 09-23-2012, 03:36 PM
Last Post: Bill (Smithville, NJ)
  HP-97 Key Contact Repair Adventure LHH 0 473 06-09-2012, 05:26 PM
Last Post: LHH
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 525 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  HP-35S..Not so bad Matt Agajanian 19 2,146 04-23-2012, 02:00 AM
Last Post: Valentino Ducati
  Bad News for 33S: a bug shared with 35s bill platt 20 2,361 03-25-2012, 03:57 AM
Last Post: Paul Dale
  HP-41C: +3V inner battery contact AlbertTocarLoseggs 3 776 03-19-2012, 04:20 PM
Last Post: AlbertTocarLoseggs
  I no longer feel bad... David Ramsey 12 1,604 03-12-2012, 07:42 PM
Last Post: db (martinez, ca.)
  Clamshell Battery Contact Repair aj04062 6 952 03-03-2012, 11:21 AM
Last Post: aj04062

Forum Jump: