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HP 9825 keyboard restoration
02-25-2017, 10:18 PM (This post was last modified: 02-25-2017 10:22 PM by Paul Berger (Canada).)
Post: #5
RE: HP 9825 keyboard restoration
(02-25-2017 01:14 PM)Tom Ward Wrote:  Frederic,

Did you have any luck finding a suitable replacement for the switches?
I've a new to me 9825T that is in need of a replacement switch.


I went down that road not to long ago, the keyboard I was repairing had water that had leached through cement drip on the keyboard and it was a huge mess. Water had got inside several key switches, and corroded away internal components others where contaminated with lime so there was no easy solution for them either. I ended up replacing a number of the switches with ones I had salvaged from the keyboard of a 4972A. They fit into the keyboard nicely but the stems are slightly longer and the cross on top is a bit smaller. I used these switches for the numeric keypad and the switches for the top two rows, because while there is only a slight difference in the length of the stem, if they are mixed it would be noticeable. To make the keytops fit on tight I initially used strips of paper as shims, but later switched to narrow strips cut from a pink static bag. These shims hold the key top on tightly with no wobble. I do not know of any exact replacement other than a keyboard from a 9825, 9831, 9835 and lily also a 9845.

If you plan to desolder and reuse a key switch be careful , don't go crazy with heat, but make sure you flow the solder before you pull on the switch or else you may dislodge elements in the switch.

Edit: This applies to the keyboard with the full stroke keys only, the early keyboards used an entirely different switch.

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Messages In This Thread
HP 9825 keyboard restoration - douze-bis - 05-04-2014, 04:48 PM
RE: HP 9825 keyboard restoration - HP67 - 05-05-2014, 06:49 AM
RE: HP 9825 keyboard restoration - Paul Berger (Canada) - 02-25-2017 10:18 PM
RE: HP 9825 keyboard restoration - jebem - 02-25-2017, 04:27 PM

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