HP22S right column of keys dead

[Siegfried]

I bought a 22S (mostly because it was rather cheap) just to find out that the rightmost column of the keyboard does not work.

I read some instructions how to open Pioneers but am at a bit of a loss on how to actually fix that row of keys.

Hints are appreciated.

[Didier Lachieze]

Just below the display there is a foam pressing the keyboard flex PCB contacts onto the main board. Overtime this foam ages and doesn’t press enough to keep good contacts. You can check that this is the issue on your 22S if you can get the right column keys to work by applying some pressure under the display.

The fix, after opening the calculator, is to replace the aging foam with a new one.

Original grey foam:



New foam:





Detailed repair instructions (in French) here.

[Siegfried]

(11-28-2022 08:44 PM)Didier Lachieze Wrote:  Detailed repair instructions (in French) here.

That’s a lot of vocabulary not covered in my French classes over 40 years ago ;-) but I should be able to make sense of it aidé par M. Google.

Thanks!

[Didier Lachieze]

(11-28-2022 09:16 PM)Siegfried Wrote:  That’s a lot of vocabulary not covered in my French classes over 40 years ago ;-)

Never too late to learn French ! It’s easier when you’ve got the right incentive

I recently refreshed my 40+ years old German with some articles from the c’t computer technik magazin.

[franz.b]

if the foam doesn't solve it, you can find among my posts the repair of the keyboard of an HP-27s that had broken tracks. There is the problem of the plastic rivets but I have adopted a working solution.

[Siegfried]

Thanks for your help! (I have already established that pressing on the area below the display helps.)