HP45 keyboard repair



#4

Randy,
You replied to an ad that I posted, regarding the repair to a HP 45 that I have that has the strips on the keyboard cracked. You suggested soldering the strips.
But what kind of soldering do I do or use, as I have never done this before
Thanking in advance again
Paul


#5

Normal Solder, used for electronic component soldering will do. Make sure the surface is clean (degrease and carefully with very fine abbrasive paper).


Succes.

#6

Paul,

As I mentioned, any classic has the parts you need to repair a bad key strip.

I've found that using a small twist drill (1.5mm) in a hand vise works well for drilling through the spot welds. Once all the welds have been opened, the entire strip will fall off, hopefully undamaged and straight. Remove the defective strip for practice, then the replacement. When choosing the replacement, remember the lower four strips are different than the upper strips.

Position the replacement carefully and use the small holes you drilled to solder it in place. Any 60/40 rosin core electronic solder will work. Clean well afterwards as flux may have migrated to the contact areas. Work from the middle to the outside to prevent warping due to expansion during soldering.

You can replace a single key if you cut it out of the strip with a sharp knife but it might be easier to start with a complete strip. Your choice. I replace singles rather than entire strips.

Good luck and post again should you have any questions.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-42S repair of unresponsive keyboard Tom Grydeland 1 222 10-08-2013, 07:04 PM
Last Post: aj04062
  HP-67 keyboard repair davorin 1 245 10-04-2013, 04:09 AM
Last Post: Katie Wasserman
  Later HP-25C Keyboard Repair aj04062 2 296 04-23-2013, 07:25 PM
Last Post: aj04062
  HP45/32E Connection Matt Agajanian 2 289 07-07-2012, 06:31 PM
Last Post: Matt Agajanian
  HP-85 Keyboard Repair aj04062 1 232 03-18-2012, 03:23 PM
Last Post: Paul Berger (Canada)
  HP-85 Keyboard Repair aj04062 0 165 02-12-2012, 07:44 PM
Last Post: aj04062
  HP45 Battery Pack Disassembly Eric_G 4 350 05-11-2011, 11:42 PM
Last Post: Eric_G
  HP45 - internal pics Alberto Fenini 2 266 08-17-2010, 04:27 PM
Last Post: Alberto Fenini
  Repair of Woodstock keyboard register problems Kees van der Sanden 0 174 04-30-2010, 03:41 AM
Last Post: Kees van der Sanden
  HP45 Original Price Bon 12 665 04-08-2010, 04:14 PM
Last Post: Wingman54

Forum Jump: